17,99 €
Lose weight and belly fat, prevent disease, boost metabolism, and live longer! So, you want to begin an intermittent fasting plan and embark on a leaner, healthier and longer life? You probably have already heard about this wildly popular health and fitness diet plan. Intermittent fasting continues to be one of the top Google trending diet searches of the year. The truth is that intermittent fasting programs are popular because they are much easier to maintain than traditional, highly restrictive, calorie-controlled diets. Scientific studies show that intermittent fasting can have extraordinary health benefits such as: * Promoting weight and body fat loss (especially stubborn belly fat) * Stabilizing blood sugar levels, reducing insulin resistance, and managing diabetes * Increasing resistance to stress and suppressing inflammation * Improving cardiovascular health including lowering resting heart rate, blood pressure and "bad" cholesterol levels * Supporting brain health and improving memory * Fighting premature aging * Fostering a healthier gut * Boosting psychological well-being If you are ready to get on the intermittent fasting bandwagon, then here is the perfect step-by-step guide to following an intermittent fasting plan of your choice. Whether it's the 16:8 method, the Warrior intermittent fasting plan; the Alternate Day intermittent fasting plan; the 5:2 method; or the Eat-Stop-Eat intermittent fasting plan. Too good to be true? No, but the trick--as with everything--is doing it in a safe and effective way and Intermittent Fasting For Dummies makes that easy, providing tried and true evidence-based advice and information about the five most popular methods and 40+ recipes that will suit any lifestyle or diet. Nutrition and fitness expert--and internationally recognized specialist in disease prevention--Janet Bond Brill shows you how to choose the method that suits you best, as well as guiding you through the science behind intermittent fasting, including how it ignites your fat-burning potential, promotes cellular repair, increases the production of growth hormone, and reduces insulin and blood sugar levels. * Choose the right plan and stick to it * Make more than 40 healthy and delicious nutritionist-approved meals * Lose weight and body fat and keep it off * Improve overall health and prevent disease Wherever you are in your health journey--seeking weight loss, getting fitter, living a disease prevention lifestyle or building muscle--Intermittent Fasting For Dummies shows you how to make the science of "too good to be true" into a truly effective part of your regular, healthy routine.
Sie lesen das E-Book in den Legimi-Apps auf:
Seitenzahl: 476
Veröffentlichungsjahr: 2020
Intermittent Fasting For Dummies®
Published by: John Wiley & Sons, Inc., 111 River Street, Hoboken, NJ 07030-5774, www.wiley.com
Copyright © 2021 by John Wiley & Sons, Inc., Hoboken, New Jersey
Published simultaneously in Canada
No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, scanning or otherwise, except as permitted under Sections 107 or 108 of the 1976 United States Copyright Act, without the prior written permission of the Publisher. Requests to the Publisher for permission should be addressed to the Permissions Department, John Wiley & Sons, Inc., 111 River Street, Hoboken, NJ 07030, (201) 748-6011, fax (201) 748-6008, or online at http://www.wiley.com/go/permissions.
Trademarks: Wiley, For Dummies, the Dummies Man logo, Dummies.com, Making Everything Easier, and related trade dress are trademarks or registered trademarks of John Wiley & Sons, Inc., and may not be used without written permission. All other trademarks are the property of their respective owners. John Wiley & Sons, Inc., is not associated with any product or vendor mentioned in this book.
LIMIT OF LIABILITY/DISCLAIMER OF WARRANTY: WHILE THE PUBLISHER AND AUTHOR HAVE USED THEIR BEST EFFORTS IN PREPARING THIS BOOK, THEY MAKE NO REPRESENTATIONS OR WARRANTIES WITH RESPECT TO THE ACCURACY OR COMPLETENESS OF THE CONTENTS OF THIS BOOK AND SPECIFICALLY DISCLAIM ANY IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE. NO WARRANTY MAY BE CREATED OR EXTENDED BY SALES REPRESENTATIVES OR WRITTEN SALES MATERIALS. THE ADVICE AND STRATEGIES CONTAINED HEREIN MAY NOT BE SUITABLE FOR YOUR SITUATION. YOU SHOULD CONSULT WITH A PROFESSIONAL WHERE APPROPRIATE. NEITHER THE PUBLISHER NOR THE AUTHOR SHALL BE LIABLE FOR DAMAGES ARISING HEREFROM. SOME OF THE EXERCISES AND DIETARY SUGGESTIONS CONTAINED IN THIS WORK MAY NOT BE APPROPRIATE FOR ALL INDIVIDUALS, AND READERS SHOULD CONSULT WITH A PHYSICIAN BEFORE COMMENCING ANY EXERCISE OR DIETARY PROGRAM.
For general information on our other products and services, please contact our Customer Care Department within the U.S. at 877-762-2974, outside the U.S. at 317-572-3993, or fax 317-572-4002. For technical support, please visit https://hub.wiley.com/community/support/dummies.
Wiley publishes in a variety of print and electronic formats and by print-on-demand. Some material included with standard print versions of this book may not be included in e-books or in print-on-demand. If this book refers to media such as a CD or DVD that is not included in the version you purchased, you may download this material at http://booksupport.wiley.com. For more information about Wiley products, visit www.wiley.com.
Library of Congress Control Number: 2020946748
ISBN: 978-1-119-72409-4
ISBN: 978-1-119-72403-2 (ebk); ISBN: 978-1-119-72410-0 (ebk)
Cover
Title Page
Copyright
Introduction
About This Book
Foolish Assumptions
Icons Used in This Book
Beyond the Book
Where to Go from Here
Part 1: Getting Started with Intermittent Fasting
Chapter 1: The Lowdown on Intermittent Fasting, Just the Basics
Defining Exactly What Intermittent Fasting Is (and Isn’t)
Considering Your Intermittent Fasting Options
Answering Your Frequently Asked Questions
Taking the First Steps of Change
Chapter 2: Assessing Your Goals
Understanding What a Healthy Weight Range Is for You
Calculating Your Healthy Weight Range
Chapter 3: Verifying Calories As Your Last Resort
Examining How Your Intermittent Fasting Plan Is Going
Calculating Your Ideal Calorie Range
Chapter 4: Understanding the Link Between Weight and Health
Discovering What the Scientists Know about Being Overweight
Beating the Odds of Inheriting the Fat Genes
Part 2: Grasping the Health Benefits of Intermittent Fasting
Chapter 5: Navigating the Science of Intermittent Fasting
Discerning What The Scientists Know about Intermittent Fasting
Understanding Why Intermittent Fasting Works
Circling the Circadian Rhythm Connection
Chapter 6: Identifying the Health Benefits to Intermittent Fasting
Comprehending Why Intermittent Fasting Is a Powerful Weight-Loss Tool
Discovering the Numerous Health Benefits to the Body
Chapter 7: Determining Whether Intermittent Fasting Is Right for You
Getting Permission from Your Personal Doctor
Throwing a Big Red Flag — Warnings for Diabetics
Recognizing Who Shouldn’t Intermittent Fast
Surveying the Eating Disorder Silent Epidemic
Restricting Children from Intermittent Fasting
Part 3: Evaluating the Most Popular Intermittent Fasting Plans
Chapter 8: Knowing What to Eat During Your Fasting and Feasting Times
Keeping Your Goals
What You Can Eat When You’re Fasting
What You Can Eat When You’re Feasting
Weighing Keto and Intermittent Fasting — Not a Healthy Combination
Chapter 9: Trying the 16:8 Time-Restricted Intermittent Fasting Plan
Clarifying What Time-Restricted Intermittent Fasting Is
Visualizing a Time-Restricted Fasting Plan — A Sample 1-Week Calendar
Chapter 10: Enlisting the Warrior Intermittent Fasting Plan
Describing What The Warrior Intermittent Fasting Plan Is
Eyeing the Pros and Cons to the Warrior Intermittent Fasting Plan
Exercising during Your Warrior Intermittent Fast
Visualizing a Warrior Intermittent Fast — A Sample 1-Week Calendar
Chapter 11: Attempting the Alternate Day Intermittent Fasting Plan
Explaining the Different Versions of Alternate Day Intermittent Fasting Plans
Understanding the Science of the Alternate Day Intermittent Fasting Plan
Benefiting from the Alternate Day Intermittent Fasting Plan
Exercising during Your Alternate Day Intermittent Fast
Eyeing an Alternate Day Intermittent Fast — A Sample 1-Week Calendar
Chapter 12: Applying the 5:2 Intermittent Fasting Plan
Shedding Light on the 5:2 Intermittent Fasting Plan
Examining the Science of the 5:2 Intermittent Fasting Plan
Exercising during Your 5:2 Intermittent Fast
Visualizing a 5:2 Intermittent Fast — A Sample 1-Week Calendar
Chapter 13: Starting the Eat-Stop-Eat Intermittent Fasting Plan
Perusing the Eat-Stop-Eat Intermittent Fasting Plan
Visualizing an Eat-Stop-Eat Intermittent Fast— A Sample 1-Week Calendar
Part 4: Customizing Your Complete Intermittent Fasting Plan
Chapter 14: Combining Daily Exercise with Your Intermittent Fasting Plan
Capturing What You Need to Know about Intermittent Fasting and Exercise
Transforming Your Body with Cardiovascular Conditioning
Healing Your Body with Strength Training
Destressing with Mindful Exercise
Chapter 15: Paying Attention to Possible Speed Bumps When Intermittent Fasting
Handling Hunger Fears
Curbing Those Cravings
Igniting Your Energy
Heading Off Headaches
Dealing With Scheduling Issues
Finding Your Stress Relievers
Chapter 16: Changing Your Connection with Food
Assessing Your Relationship with Food
Breaking Your Behavior Chain
Diving into Mindful Eating
Part 5: Intermittent Fasting Made Easy: Eating, Shopping, and Cooking
Chapter 17: Adding the Mediterranean Diet to Your Intermittent Fasting Plan
Incorporating the Mediterranean Diet into Your Intermittent Fasting Plan
Grasping the Laws on Lean Protein
Making Extra-Virgin Olive Oil (EVOO) Your Main Fat
Keeping Those Grains Whole
Powering Up with Plants
Chapter 18: Going Grocery Shopping, Healthfully
Finding Your Way around the Supermarket
Knowing How to Read Labels
Chapter 19: Stocking Your Fridge, Freezer, and Pantry with Nutrition
Organizing a Healthy Refrigerator
Arranging a Healthy Pantry
Chapter 20: Making Cooking at Home a Delicious Habit
Simplifying Your Cooking and Your Life
Boning Up on the Healthiest Cooking Techniques
Utilizing Additional Tips And Tricks to Maximize Nutrient Retention
Chapter 21: Starting Your Healthy Recipe Collection
Serving Up Appetizers for Intermittent Fasting
Savoring Salads, Soups, and Sandwiches
Planning Plant-Based Entrees for Intermittent Fasting
Fishing for Seafood Entrees
Making Mediterranean Side Dishes for Intermittent Fasting
Diving into Desserts and Snacks for Intermittent Fasting
Chapter 22: Creating Your 5:2 Intermittent Fasting Recipes
Making 500-Calorie Meals for Women
Creating 600-Calorie Meals for Men
Part 6: Using Tools for Success
Chapter 23: Tracking Your Intermittent Fasting Progress
Journaling for Success
Graphing Your Progress
Penciling in the Bigger Picture — Keeping Track of Why
Chapter 24: Getting Support during Your Intermittent Fast
Getting Help from a Professional
Enlisting Friends and Family
Dealing with Setbacks
Part 7: The Part of Tens
Chapter 25: Ten Myths about Intermittent Fasting Debunked
Intermittent Fasting Puts Your Body Into Starvation Mode
Skipping Breakfast Makes You Fat
Intermittent Fasting Slows Metabolism and Frequent Meals Boost It
Eating Three Meals a Day Is Better for Your Health
You Need to Eat Protein Every Three Hours to Gain Muscle
Intermittent Fasting Makes You Lose Muscle
Intermittent Fasting Triggers Excessive Hunger and Makes You Overeat
Intermittent Fasting Is Harmful to the Brain
Intermittent Fasting Causes Dangerous Drops in Blood Sugar
Intermittent Fasting Is Too Hard
Chapter 26: Ten Healthiest Superfoods to Include When Intermittent Fasting
Black Coffee
Spinach
Quinoa
Extra-Virgin Olive Oil (EVOO)
Black Beans
Beets
Nuts and Seeds
Broccoli
Blackberries
Lentils
Index
About the Author
Connect with Dummies
End User License Agreement
Chapter 7
TABLE 7-1 Ideal Test Numbers to Aim For
TABLE 7-2 Comparing Type 1 and Type 2 Diabetes
Chapter 8
TABLE 8-1 What You Can Drink during Fasting Periods
TABLE 8-2 Slow-Digesting Carbs
Chapter 10
TABLE 10-1 Pros and Cons to the Eat-Stop-Eat Plan
Chapter 13
TABLE 13-1 Pros and Cons to the Eat-Stop-Eat Plan
Chapter 17
TABLE 17-1 Protein Choices — Mediterranean Style
Chapter 23
TABLE 23-1 Jenna’s SMART Goals for Week 1
TABLE 23-2 Brian’s Three-Month Goal Sheet
Chapter 2
FIGURE 2-1: Body Mass Index chart.
FIGURE 2-2: Percent body fat categories.
Chapter 3
FIGURE 3-1: Breaking down your total daily energy expenditure.
Chapter 4
FIGURE 4-1: Thirteen cancers associated with being overweight.
FIGURE 4-2: Visceral fat versus subcutaneous fat.
Chapter 6
FIGURE 6-1: The health benefits of intermittent fasting.
FIGURE 6-2: Effects of intermittent fasting on the body that contribute to dise...
Chapter 9
FIGURE 9-1: A sample 1-week 16:8 intermittent fasting plan.
Chapter 10
FIGURE 10-1: A sample 1-week Warrior intermittent fasting plan.
Chapter 11
FIGURE 11-1: Alternate Day intermittent fasting pattern used in this study.
FIGURE 11-2: A sample 1-week Alternate Day intermittent fasting plan.
Chapter 12
FIGURE 12-1: A sample 1-week 5:2 intermittent fasting plan.
Chapter 13
FIGURE 13-1: A sample 1-week Eat-Stop-Eat intermittent fasting plan.
Chapter 14
FIGURE 14-1: Recommended exercise frequency (days per week).
Chapter 16
FIGURE 16-1: An emotional eating behavior chain.
FIGURE 16-2: A hunger scale.
Chapter 17
FIGURE 17-1: A grain — the bran, germ, and endosperm.
FIGURE 17-2: Whole Grain Stamps.
Chapter 18
FIGURE 18-1: Shop the perimeter of the supermarket for the freshest foods.
FIGURE 18-2: A sample Nutrition Facts label.
Chapter 23
FIGURE 23-1: Mike’s sample body composition graph.
FIGURE 23-2: Weight, body fat, and waist circumference body composition graph.
FIGURE 23-3: Jenna’s notes to herself during Week 1 to keep her motivated.
Cover
Title Page
Copyright
Table of Contents
Begin Reading
Index
About the Author
i
ii
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
105
106
107
108
109
110
111
112
113
114
115
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
Congratulations, you’ve come to the right place if you want to lose weight and body fat, get more fit, and improve your health! Fasting has been used throughout history to promote weight loss and increase longevity. Intermittent fasting, currently one of the world’s most popular health and fitness trends, is a newer style of fasting that has gained considerable recognition in recent years, because many people find these regimens easier to follow than traditional, highly restrictive, calorie-counting diets. It’s an uncomplicated concept, which makes it simple to follow without the deprivation associated with other diets. Translation: Intermittent fasting equals freedom! Intermittent fasting is not a diet in the conventional sense, but rather an eating pattern — a timed approach to eating.
That’s why intermittent fasting has generated such a positive buzz — anecdotes of its effectiveness have proliferated around the globe. With intermittent fasting having become the go-to lifestyle, as a lifestyle research doctor, I needed to understand the science. So, I read the data and discovered a mountain of rock-solid scientific evidence showing that intermittent fasting, when combined with a healthy diet and lifestyle, is a remarkably effective approach for losing body fat, especially stubborn belly fat; maintaining or even gaining muscle; and treating or preventing many diseases and conditions that plague Americans.
What makes this health trend so popular? It’s not really a diet, per se, but a new style of eating and living that after you get the hang of, it can allow you to attain your health and wellness goals and still embrace life and eat the delicious, healthy foods you love. You’ll find out that it’s not so much about what foods you should eat but more so, when you eat. As they say, “timing is everything.”
Intermittent Fasting For Dummies gives you all the tools you need to follow an intermittent fasting plan. Discover why simply changing the timing of your meals to allow for periodic breaks in eating can make such a positive difference in your body. With all the conflicting information about intermittent fasting out there, you may be wondering what’s real and what’s fake advice.
This handy guide puts all the important information together in plain English, laying out easy-to-follow guidelines for the different methods as well as describing what intermittent fasting can do for you — help you lose the fat for good, get healthier, fight disease, and hopefully increase your longevity. Remember, you are in charge, and you decide what will work for you.
By helping you eat fewer meals, intermittent fasting can lead to an automatic reduction in calorie intake. Additionally, it will positively change your hormone levels and flip the switch on your metabolism to facilitate all kinds of healthy bodily processes.
Specifically this book discusses the five most popular methods of intermittent fasting. Each type is effective, but may not be the right fit for everyone. You’ll find out how to practice the different varieties of intermittent fasting as well as determine which method works best for your specific lifestyle.
This book is different from other books available about intermittent fasting because it’s researched and written by a trusted expert in nutrition, health, and fitness — a registered dietitian and nutritionist — me! You can have confidence that the plans in this book are safe and based on sound science.
When writing this book, I made the following assumptions about you:
You may want to lose weight and keep it off.
You may want to get rid of excess body fat (especially stubborn belly fat).
You may already be lean and fit but want to tap into the myriad health benefits associated with intermittent fasting.
You want to increase your energy level and boost your metabolism.
You may have tried multiple diets in the past and been frustrated with the process and possibly gained back the weight.
You want to reduce the risk of diabetes, cancer, and heart disease.
You may want to simplify your life by freeing up time previously used to plan, cook, and clean up after all those meals.
You may have sensed all the excitement about intermittent fasting and want to give it a whirl.
You want to live a long, happy and healthy life.
Throughout this book, and in true For Dummies fashion, you’ll notice several icons — all of them are designed to help you better understand and get the most out of your intermittent fasting plan. The following is a list of the icons you can expect to see throughout this book and what they mean:
This icon points to a tip that you can help your intermittent fasting process easier to follow.
This piece of information is especially noteworthy and important.
Warnings, if posted, are enormously significant. Be wary!
This book is based on scientific data and hypotheses, which may get a bit technical in the explanation. I hope to explain the scientific jargon in easy-to-grasp concepts, but if it’s too confusing, skip it.
I’ll occasionally direct you to a helpful website with this icon.
In addition to all the information in this book, you can find additional information online to help you with your intermittent fast. If you want to discover more about nutrition, healthy eating, and the Mediterranean Diet, you can visit my websites:
www.DrJanet.com
: For nutrition tips, recipes, blogs, book and app links, and all things nutritious and healthy, visit my website. You can also find out about my extensive credentials so you can have full confidence in my written nutrition advice.
www.MediterraneanNutritionist.com
: This website is your one-stop Mediterranean eating guide.
U.S. News & World Report
has consistently rated the Mediterranean Diet as No. 1 in numerous categories.
You can read the entire book from cover to cover or if that’s not how you want to go about it, feel free to go to the Table of Contents and read the chapters that most interest you right now. You may want to start in the kitchen or supermarket, stocking up on delicious, nutritious foods for recipes in Chapters 21 and 22. Perhaps you may want to start with Chapter 1 to get an overview of intermittent fasting. Or you may decide to peruse the Parts of Tens first to get a quick overview of key recommendations in bite-sized bits of information. Regardless, this journey is all about putting you in charge. It’s about you taking control of your life and changing when you eat while still enabling you to choose what you eat.
If you want additional information to reference whenever you want, refer to the Cheat Sheet at www.dummies.com. Just search for “Intermittent Fasting For Dummies Cheat Sheet.”
Part 1
IN THIS PART …
Find out what intermittent fasting is and why this eating pattern is a complete game-changer.
Evaluate whether intermittent fasting is a lifestyle that’s feasible for you and what you need to do if it is.
Assess where you’re beginning so you can figure out where you want to go with your intermittent fasting plan.
Determine your ideal weight range for your personal health to get you a clearer picture of what is a safe and sustainable weight and percent body fat goal.
Get up to speed on this exciting method of losing body fat (especially the dangerous belly fat) and getting healthier.
Chapter 1
IN THIS CHAPTER
Entering the world of intermittent fasting
Visualizing what intermittent fasting can do for you
Answering your frequently asked questions
Starting the walk toward the path of change
You want to begin an intermittent fasting plan and embark on a leaner, healthier, and longer life. (You wouldn’t be reading this book otherwise, right?) You may have heard that intermittent fasting is the key that unlocks everything from sustainable weight loss to increased mental clarity to a serious boost in energy. You may have asked your healthcare provider about how to follow this wildly popular diet but given her limited nutrition knowledge, you may not have received valid information.
So in vogue is this health and fitness trend, that it has moved into fad diet territory — meaning intensely popular for a short period of time — spawning massive amounts of misinformation at your fingertips. Because of its fad status, you may have fallen prey to illegitimate intermittent fasting claims and techniques proliferating on the Internet. This chapter serves as your jumping-off point to the world of intermittent fasting and explains in plain English what intermittent fasting is, based on sound science.
Before you can understand what intermittent fasting is, I first need to discuss fasting, which is different from intermittent fasting. Fasting is refraining from consuming food or drinks, except for water, for a set period. Traditional fasting, for lengthy periods of time, isn’t a healthy means of weight loss and can be extremely dangerous. In fact, long-term fasting starves the body of essential nutrients, causes the body to shut down (metabolism slows dramatically), and can be life threatening.
This nutrition myth pervades the dieting world, with confusion occurring because the term starvation mode means many different things to many different people. The often-repeated belief is that when trying to lose weight, you shouldn't drop your calories too low, because your body will go into starvation mode, and you’ll hold onto fat and stop losing weight. This is 100 percent false. You don’t gain weight or fat from eating too little. You won’t go into a starvation mode during your intermittent fasting regimen.
Consider these facts:
The starvation mode refers to the reduction in metabolic rate that occurs when the body is starved for long periods of time, such as observed in severely malnourished people with anorexia nervosa.During severe starvation, the body does in fact slow its metabolism down, dramatically; the body's natural physiological response to an extreme reduction in calorie intake, a technique the body uses as a survival mechanism. Without it, humans would have become extinct thousands of years ago.The starvation mode does not occur during most people’s dieting experiences. Dieting, even low-calorie diets, don’t catapult your body into starvation mode.When you lose weight, your body will require less calories to maintain your new body weight because there's less of you, so you require fewer calories, a concept referred to as metabolic adaptation.You can offset this metabolic adaptation and keep your metabolism as high as possible when losing weight by adding in strength-training exercise and making sure you eat enough protein.However, intermittent fasting differs from traditional fasting. As the name suggests, intermittent fasting refers to alternating periods of fasting with periods of eating. It’s a broad term, encompassing several specific types of short-term fasting protocols. The common theme among intermittent fasting regimens is that people periodically abstain from eating for periods longer than the typical overnight fast. Individuals either fast during a certain window every day or block out certain days of the week. These short eating rest periods allow the body’s numerous systems to rest and reset without triggering the risk of malnutrition and metabolic slowdown that accompanies severely restrictive long-term fasting regimens.
Here I take a closer look at what intermittent fasting is and some of the dos and don’ts of getting started on your intermittent fasting journey.
Here are the key principles of intermittent fasting lifestyle methods:
All intermittent fasts restrict eating and drinking for set, short periods of time.
Every method of intermittent fasting outlined in
Part 3
has feasting and fasting periods that vary, depending on the regimen.
The intermittent fasting approach involves alternating periods of eating and fasting.
These time periods differ depending on the variation of intermittent fasting, so you choose the method that works best for your lifestyle.
All intermittent fasting protocols are safe and effective for healthy individuals.
Each of the methods in
Part 3
are safe and have been shown to improve a person’s health and well-being, if practiced correctly.
All intermittent fasting protocols have certain rules you must follow during your fasting window.
These steps include drinking plentiful amounts of water, black coffee, tea, and any other non-caloric beverage during your fasting window; just no solid foods allowed. Make sure to stay hydrated during your intermittent fasting periods.
All intermittent fasting protocols prohibit you from eating excessive amounts of junk food during your eating windows.
This habit will negate the many benefits of intermittent fasting. The biggest mistake people make is eating too much and eating unhealthy foods during their eating periods.
Intermittent fasting can be practiced for health and fitness and not necessarily for weight loss.
Although weight loss is one of the most common reasons for trying intermittent fasting, many people choose to get leaner and fitter and tap into the numerous health benefits intermittent fasting provides without the goal of losing weight. In fact, some follow an intermittent fasting program with the primary goal of gaining muscle weight and losing body fat.
Although intermittent fasting is a healthy choice for some, for others, it can be dangerous. Several groups of people who absolutely should not fast include the following:
Pregnant or lactating women
Individuals who have eating disorders
Individuals with type 1 or type 2 diabetes unless working with their healthcare professional (physicians
must
be consulted if you have any underlying chronic disease)
Individuals using medications that they must take with food, unless working with their physician
High-level endurance athletes
Elderly individuals with balance issues
Children
Chapter 7 discusses in greater detail who should and shouldn’t follow an intermittent fasting plan.
Intermittent fasts cycle between periods of fasting with periods of eating. Whether or not you’re fasting, the body still requires energy to run efficiently. The body’s main source of energy is a sugar called glucose, which typically comes from carbohydrates such as grains, fruits, vegetables, and even sweets. Both your liver and muscles store the sugar and release it into the bloodstream whenever the body needs it.
To understand how intermittent fasting works, you need a quick adaptive physiology refresher. Because food wasn’t always abundant, and sometimes wasn’t available at all, the human body was forced to adapt to fasting involuntarily — and then, when Stone Age humans found food, they would feast. Because of those evolutionary conditions, human bodies evolved to permit their bodies to thrive by adapting to those cycles of feasting and fasting. In order to survive in such environments where food was scarce, humans had to possess the ability to quickly shift their metabolism from fat storage to fat breakdown for energy. This metabolic flexibility became built into human’s genetic code, producing a system where energy was stored in the form of body fat when food was available and then easily accessed for energy to enable humans to perform at a high level, physically, during extended periods when food wasn’t available. This pattern enabled human brains and bodies to function optimally in a food deprived/fasted state, giving the human race a survival advantage.
Scientists have hypothesized that the human body’s adaptive benefits of intermittent fasting led to the superior cognitive capabilities (brain power) of humans compared to other mammals. These brain adaptations facilitated human’s ability to invent tools, novel hunting methods, animal domestication, agriculture and food storage, and processing.
Because intermittent fasting patterns can replicate the feast-or-famine diet of human ancestors, many researchers have now recognized the advantages of periodically fasting (such as increased brain power, physical enhancements, and disease prevention) for the multitude of health benefits this lifestyle gives rise to.
What is the physiology of fasting? Although everybody responds to fasting a little differently (genetics, health, and age all play a role), there is a general timeline of events — a predictable set of metabolic responses as your fast stretches from hours into a day or longer. (For a much more detailed discussion of the different metabolic states your body goes through when practicing intermittent fasting, refer to Chapter 5.)
After fasting for a mere eight hours, here is the timeline of what happens in your body:
You have no food coming in, so you exhaust your supplies.
Your body has tapped into your liver reserves of blood sugar to continue to keep your blood sugar level in the normal range. You’re now in what’s termed a catabolic or breakdown state.
You enter the fasted state; your liver has run out of its sugar reserves.
This triggers the liver to manufacture new sugar from noncarbohydrate sources (scientifically termed gluconeogenesis) to continue to supply energy to the cells. With no carbohydrates consumed, the body creates its own sugar by using mainly fat. This marks the body’s transition into the fasting mode. Studies have shown that gluconeogenesis increases the number of calories the body burns, meaning when your metabolism starts to increase.
You flip your metabolic switch.
One key mechanism responsible for many of the beneficial health effects of short-term, intermittent fasting is flipping of the metabolic switch. The metabolic switch is the body’s preferential shift from utilization of blood sugar to fat and fat-derived ketones for energy. In this step, your body breaks down fat, shuttling it to the liver, which creates ketones from fat to use for energy. The metabolic switch typically occurs between 12 to 36 hours after cessation of eating.
Extended fasts (longer than 36 hours) begin to slow metabolism down.
That’s why you shouldn’t practice extended fasting with intermittent plans. After about 36 hours, the body stops using these energy sources (sugar and fat). The fasting mode then transitions to the more serious starvation mode.
You enter starvation mode.
At this point, your metabolism has slowed dramatically, and your body begins to burn your own muscle protein for energy. The lack of essential nutrient intake plus using muscle for energy sets off an alarming cascade of dangerous complications.
During your recommended intermittent fasting periods, your fasting periods shouldn’t extend beyond 36 hours. Although some people choose to fast for up to 48 hours, I recommend your intermittent fasting periods don’t extend 36 hours because of the physiological reasons I mention here. Chapter 5 probes much deeper into the science of intermittent fasting.
The most effective dietary plan is the one you can adhere to for the long term while still living your best life. If you want to lose weight and are sick and tired of counting calories, then this eating pattern may be the right fit for you. The popularity of intermittent fasting lies in its simplicity and the fact that the fasting periods are time-limited, which people find easier to maintain than traditional diets.
Intermittent fasting is not only for people who want to lose weight, but it’s also a phenomenal lifestyle plan for individuals who want to improve their health, fight aging, and simplify their lifestyle. The scientific data shows intermittent fasting has powerful effects on your body and brain and may even extend your life. Chapter 6 discusses the miraculous health benefits linked to intermittent fasting.
Part 3 discusses the five most common ways of practicing intermittent fasting in detail. These different alternative protocols are as follows:
Time-restricted intermittent fasting:
The
time-restricted intermittent fasting
, also called the
eating window plan,
is by far the most popular plan, because many rave about it being the easiest to follow. This plan consists of fasting for a daily 16-, 18-, or 20-hour consecutive period and setting your daily eating window for the remaining 8, 6, or 4 hours (albeit, you can use other time windows). Check out
Chapter 9
for more details.
Warrior intermittent fasting plan:
The
warrior intermittent fasting
plan is based on the eating patterns of ancient warriors who ate very little during the day and then feasted at night. Flip to
Chapter 10
for the details on this method of intermittent fasting.
Alternate day intermittent fasting:
Alternate day fasting (ADF),
another form of intermittent fasting, involves fasting one day, eating the next, and repeating.
Chapter 11
gives you the lowdown on this method.
5:2 intermittent fasting plan:
The
5:2 plan,
also known as the
fast diet,
entails eating 500 to 600 calories on two nonconsecutive days of the week.
Chapter 12
explains the ins and outs of this plan.
Eat-stop-eat intermittent fasting:
This plan requires fasting for a full 24 hours, once or twice a week. Head to
Chapter 13
for how to incorporate eat-stop-eat intermittent fasting into your life.
Choosing the best intermittent fasting plan is simply a matter of preference. All the intermittent fasts in this book, if followed as directed, will result in weight loss (if desired), maintenance of muscle mass, and myriad additional health benefits. My goal is to explain all of them so that you can choose the one that fits you best. Remember, you are the one in control. The ideal intermittent fasting method for you is the one that is most sustainable and easiest to stick with. If you try one and it doesn’t help you achieve your health and wellness goals in a reasonable time frame, switch to another. In fact, switching up your fasting plan can be beneficial as well, from a physiological standpoint. You may also consider assessing some of your barriers to change by doing some of the journaling exercises suggested in Chapters 2 and 23.
For more than a hundred thousand years, humans roamed the earth. They were foragers, so they’d fast until they found, caught, or killed their food. Like so many animals in the wild, human’s paleolithic ancestors regularly experienced extended time periods with little or no food. The timing of eating depended on the availability of food; they ate opportunistically. Because humans evolved in environments where food was relatively scarce, they developed numerous adaptations that enabled them to function at a high level, both physically and cognitively, when in a food-deprived/fasted state. Importantly, metabolic, endocrine, and nervous systems evolved in ways that facilitated high levels of physical and mental performance when in the fasted state (from approximately 12 to 36 hours without food). Both the metabolic shift to ketone utilization (a chemical derivative of fat), and adaptive responses of the brain and nervous system to food deprivation play major roles in the fitness-promoting and disease-allaying effects of intermittent fasting.
Hunter-gatherers gathered berries off bushes; dug up tubers; hunted mammals; scavenged meat, fat, and organs from previously killed carcasses; and discovered how to fish and hunt with spears, nets, bows, and arrows. Furthermore, their activity level is a far cry from the sedentary lifestyle so many people today lead. By the 20th century, most hunter-gatherers had vanished from the face of the earth (currently only a few scattered tribes of hunter-gatherers remain on the planet).
Then came farming
Some 10,000 to 12,000 years ago, things began to change. Homo sapiens altered their lifestyle from hunting and gathering to a more sedentary routine of farming — what’s termed the agricultural revolution. The human diet also took a major turn with the invention of agriculture. The domestication of grains created a plentiful and predictable food supply — food security — which allowed for storing surplus food. Provisions became readily available, hence people no longer had to eat opportunistically, and fasting was no longer necessary. The development of agriculture also brought a great societal transformation. People shifted from a nomadic existence to living in permanent communities, agrarian cultures.
The Industrial Revolution changed it all
Then the Industrial Revolution happened in the United States from the mid-19th century until the early 20th century. This shift in work routines permanently altered the way Americans eat. Refrigeration and transportation allowed for storing, packaging, and transporting of foods. Work shifted from farm to factory, and the human-eating schedule went to the three-meals-per-day routine that is the current eating pattern. Today, most Americans eat three meals and multiple snacks and rarely go more than four daytime hours without eating.
Intermittent fasting is right for anyone seeking a longer, healthier life. However, as a new phenomenon, you may have a host of questions that you want answered to help you determine whether intermittent fasting is right for you. Here are some common questions and answers to help you make that decision:
Is hunger hard to deal with when practicing intermittent fasting?
In the beginning, you’ll feel hunger pangs during your fasting periods. Most intermittent fasting newbies figure out how to accept, adjust, and dull hunger pangs, which typically dissipate after about a month on an intermittent fasting program. I explore how you can deal with the potential negative side effects of intermittent fasting in depth in
Chapter 15
.
Do you have to exercise when practicing intermittent fasting?
Yes, but no marathons are required! All Americans need to move more for better health. Because you’re entering into a lifestyle program aimed at improving your health, this one does indeed advocate daily exercise.
Chapter 14
explores the specifics on exercise.
How long should you fast for?
You’ll see health benefits from fasts of from 14 hours to 36 hours. The ideal fasting window and ultimately fasting regimen will vary depending on you. What matters is the duration of fasting that works for your lifestyle.
Can you drink alcohol when practicing intermittent fasting?
Yes, you can during your eating windows, in moderation, and if you can drink responsibly. You should know that drinking any amount of alcohol increases your risk of seven different types of cancer.
Can you have a cheat day during intermittent fasting?
One of the phenomenal attractions of intermittent fasting is the concept that you get lots of cheat days — built in. Technically, you can eat whatever you want during your eating windows. This simple idea of freedom in eating is very motivating — fast today for tomorrow you feast!
Can you gain muscle when practicing intermittent fasting?
Yes, studies have shown that combining intermittent fasting with a program of strength-training designed to increase muscle mass will result in muscle gain and fat loss. For details on how to gain muscle while practicing intermittent fasting, flip to
Chapter 14
.
Well, it sure wasn’t filet mignon! Human ancestors evolved as hunters and gatherers; for hundreds of thousands of years, their lives were spent searching for food. Believe it or not, some scientists believe that early humans had a diet like pigs. (Pigs are omnivores, meaning they consume both plants and animals. In the wild, they forage for anything and everything edible such as leaves, roots, fruits, flowers, insects, and fish.) What can be said for certain is that in the Paleolithic age, the human diet varied immensely by geography, season, and opportunity. Humans were flexible eaters, opportunistic eaters who ate what was available depending on their geographic locale. For example, humans in the Arctic ate almost all animal foods (seafood), whereas populations in the Andes sustained themselves on primarily plant foods (tubers and cereal grains).
Can you take medications and supplements when practicing intermittent fasting?
Yes, you must continue taking your prescription medications as directed (and should only practice intermittent fasting under the guidance of your personal healthcare provider). If you need to take your meds with food, on a daily basis, choose an intermittent fasting plan that allows a daily window of eating for your medications. Supplements, as long as they contain negligible calories, can be taken as usual. Check with your healthcare provider if you have any concerns.
Intermittent fasting is a major lifestyle change for everyone. Before you commit to taking the first steps or just diving right in, you may be interested in discovering the basic steps of making major life changes. The three basic steps for change are:
Know yourself.
After you do that, you can grasp what you need to change and be able to gauge how much you’ve changed. You’ll be figuring how to take a personal inventory and how to set SMART goals that I discuss in Chapter 2. Take baby steps and focus on achieving small goals every day.
Take away the knowledge in this book as power.
Find the wisdom that for you is most relevant and leave behind the rest of the words that don’t help you.
Practice what you’ve read.
Imbibe the principles and carry them out in your life. Fight back against procrastination and inactivity and vigorously apply the knowledge you have acquired.
Life is complicated, and intermittent fasting simplifies it. Food is expensive; with intermittent fasting, you save money. Shopping, cooking, and cleaning up meals is time consuming; intermittent fasting saves you time. These benefits are what make intermittent fasting so popular among the life hacker crowd. Life hacks are strategies or techniques adopted to manage one’s time and daily activities in a more efficient way. Adopting life hacks is all about eliminating life’s manifold frustrations in simple and ingenious ways. Take your first steps of change by hopping on the intermittent fasting bandwagon and start today to sooth your brain by mitigating some of life’s stress.
Chapter 2
IN THIS CHAPTER
Mapping out your personal weight history
Analyzing your reasons for starting intermittent fasting
Applying SMART goals
Using a toolbox to measure your progress
Creating your starting line
No lifestyle change program will work until you set a goal for success. Achievable goals serve as your road map markers for your entire lifestyle-change journey. Without these guides, you’re like a driver who hops in the car and starts driving without any idea of where he or she’s going.
But before you figure out how to set your goals, you need to begin by taking an honest self-inventory — a process that will toughen your resolve and help you succeed in your intermittent fasting lifestyle. With that information, you can summon the strength to keep taking steps forward and overcome the occasional roadblocks that life inevitably sends our way.
Having a firm grasp of your current weight and body composition is also very valuable information. Knowing where you are when you start can help you to track your progress as you incorporate intermittent fasting into your lifestyle.
This chapter is all about assessing where you are now and establishing where you want to go (your long-term health and fitness goals). Following one of the intermittent fasting plans that I discuss in Part 3 can give you what you need to achieve your goals and stay healthy and fit for life.
If you want to lose weight from intermittent fasting, you first need to know what a healthy weight range is for you. With that information, you can better understand what your short-terms goals are (baby steps) and your long-term goals or healthy weight range (your finish line).
The benefits of losing weight aren’t just cosmetic. Getting to a healthy weight can remediate and prevent dangerous health conditions that contribute to a shorter life. You also get a self-esteem boost, another valuable benefit.
You may be okay with your current weight and simply want to hop on the intermittent fasting train for the additional health benefits derived from this eating pattern such as disease prevention and anti-aging effects. If so, feel free to skip to Part 3 and dive right into an intermittent fasting plan that is right for you.
If you’re considering intermittent fasting, make sure you first consult your doctor. Intermittent fasting must be conducted under the watchful eye of your personal doctor if you have been previously diagnosed with a chronic disease. If you have an eating disorder, intermittent fasting absolutely isn’t allowed.
People come in all sizes and shapes, with different life experiences related to their personal health and fitness. Before you estimate what a healthy weight range is for you, you need to take several preliminary steps to help you get a clearer picture of what healthy weight range is right for you.
A fearless self-inventory and your weight history help you get to the root of your battle of the bulge. With this information, you can cut through past experiences and grasp the power that food has had over your life. If knowledge is power, then knowing yourself better helps you gain power over your eating habits.
The questions in this self-inventory also can help you realize that you can’t change history — but you can equip and strengthen yourself for the future. Look closely and honestly at your past efforts, challenges, and previous weight-loss success. Defining why you want to lose weight may help you stay motivated when complacency sets in.
Put yourself under a microscope and ask yourself these questions. Jot down your responses in your journal or notebook (refer to Chapter 23 for more about journaling your intermittent fasting voyage).
Were you overweight as a child? If so, how did your parent(s) react?
Does your weight affect your self-esteem? If yes, describe how.
Does your weight or the scale number affect your mood? If yes, describe how.
Does your weight affect your relationships? If yes, describe how.
Do you reach for comfort food in times of stress? If yes, describe how and when.
Does fitting into clothes or not fitting into them affect your mood? If yes, describe how.
How many diets have you tried in your lifetime? Describe them.
If you lost weight in the past, were you able to keep it off? If yes, how?
If you lost weight in the past and gained it back, what were the circumstances?
If you overeat or binge eat, what triggers that behavior and what time of day does it occur?
What is the lowest weight that you have been able to maintain as an adult for at least several months? What were the circumstances?
When you were at a weight in your adult life that you were happy with? What was your activity level? What were the circumstances?
Has your doctor ever expressed concern about your weight? If yes, describe her conversation with you.
This inventory can help you be empowered to change your life. I encourage you to revisit your answers periodically during your intermittent fasting journey. Reading your life history as it pertains to your weight can be a powerful motivator to get you back on track, should an obstacle arise in your newfound lifestyle.
Following a reduced calorie healthy diet and exercise plan can unquestionably help you lose weight. Analyzing the reasons that drive you to lose the weight in the first place will aid you in your efforts to keep weight off. Being introspective about the real reason you want to lose weight facilitates your success in achieving your goals and is a powerful motivator for acting on and maintaining your goals.
Here are many of the most common reasons people want to lose weight. Figure out which ones motivate you the most:
Maintaining good health:
Being overweight is bad for your health; it raises blood pressure (the silent killer) and increases risk of heart disease, diabetes, and certain types of cancers (such as breast cancer). Avoiding these diseases can be a strong motivator for people to want to lose weight. Living a healthy lifestyle leads to living a longer and higher quality of life.
Boosting your energy level:
This reason may seem counterintuitive, but intermittent fasting leads to an energy boost. Extra body fat requires energy to maintain, so lose the fat and you redirect all that energy to living life.
Feeling better about oneself:
Society denigrates the overweight with a barrage of messages that thin is in and fat is ugly. This very real social shaming can take a toll on peoples’ self-esteem. Embarrassment about one’s looks can diminish self-confidence, which can lead to anxiety and depression. Feeling better about oneself and looking good is a compelling incentive to shed those pounds.
Decreasing joint problems:
One of the common side effects of excess body weight is joint pain, especially in the knees. Too much body weight stresses the joints and can lead to wear and tear, potentially resulting in arthritis. Joint pain can be extraordinarily painful, which creates a viscous circle, increasing weight gain by curtailing the ability to exercise.
When choosing to follow a new lifestyle, you’ll need to change behaviors. Behavior change requires determination and practice, but most of all, you need to know how to set goals that work for you that are achievable. Lasting behavior change relies on goal setting. Ideally, you want to set one small goal every week. To give you the best chance of success, your goals should:
Represent concrete actions and not wishful thinking
Incorporate your own personal preferences and activities that you enjoy, which will increase the likelihood of attaining your goals
Be written in the form of SMART goals
These sections examine in greater detail what SMART goals are and how you can form your own goals.
A SMART goal is created with the following in mind:
Specific:
Say exactly what you want to achieve such as “I’ll confine my eating window to a specified eight-hour window, every day for the next seven days,” instead of “I want to follow the 16:8 intermittent fasting plan.”
Measurable:
You need to be able to verify that you attained your goal. For example, “I’ll mark off on my intermittent fasting schedule that I ate during my set fasting window every day,” instead of “I’ll choose what time I want to eat, each day as it comes.”
Actionable:
Meaning your goal is action oriented. “I’ll eat between the hours of 12 p.m. and 8 p.m., every day and only drink calorie-free beverages during my fasting hours.” Eating and drinking are action verbs.
Realistic:
Your goal should be something you believe you can achieve, not something too difficult. If you know with 100 percent certainty that you can easily avoid eating or drinking calorie-containing foods from the time you wake up until 1 p.m. and continue fasting from 8 p.m. until noon the next day, then this goal is realistic for you.
Time-bound:
Setting a deadline for your goal is important, so you have an end in sight. One week is a doable time frame for most people. If you plan to follow the 16:8 intermittent fast, map out a one-week schedule in advance — it’s motivating because it gives you a set, doable, time frame.
Use your answers to the questions in the previous section to formulate your SMART goal. For example, “This week, I’ll walk 20 minutes on my treadmill, every day at 3 p.m. for the next 7 days, at a 20-minute per mile pace.” This is a SMART goal instead of “I want to start an exercise program.” Look at how this goal is broken down:
Specific:
Walking on the treadmill for 20 minutes is specific.
Measurable:
You measure 20 minutes on the treadmill.
Actionable:
Walking is an action.
Realistic:
This plan of action is doable if you’ve previously walked for exercise.
Time-bound
: Walking for 20 minutes for the next 7 days is time-related.
Write your first weekly SMART goal in a journal of your choice, on your smart phone memo pad, or on a sheet of paper that you copied from Chapter 23. Make your goal something small, one that you’re 100 percent positive that you’ll accomplish.
After you’ve finished your first weekly SMART goal, you’re not done. Ask yourself the following:
Did I achieve my goal this week?
If yes, then take the time to create a new one.
If no, then analyze where the problem was and then create a new, more achievable goal.
In addition to your significant small, weekly SMART goal, you can set a big-picture, long-term goal. Setting long-term goals of, say three months, is helpful for mapping out your intermittent fasting journey. Three months is like goldilocks — not too far off, but still close enough to be palpable. Your long-term goal sheet will cover not only weight goals but also health and fitness goals. You can find a blank three-month weight, health and fitness goal sheet in Chapter 23.
Here is an example of a realistic three-month goal:
Weight:
I’ll lose 10 pounds in the next three months. I’ll measure my weight on the scale to track my progress.
Health:
Losing this weight will help lower my blood sugar (I am pre-diabetic) to reduce my risk for diabetes. I’ll test my fasting blood sugar to track this health marker.
Fitness:
Losing fat and becoming a fitter person will help me to move more comfortably when I go hiking with my kids. I’ll test this by completing the one-mile hike that I currently cannot finish.
If you don’t reach your weekly goal, no big deal, just formulate a new weekly SMART goal. Ensure that this week’s SMART goal is going to be more achievable. If you did achieve your goal, reward yourself — no need for anything expensive — a simple pleasure such as buying a new book, getting a massage, or soaking in a hot bath, whatever makes you happy.
After you achieve your long-term goals, have a big celebration! You can pencil into your calendar something that’s really important for you to reward yourself with and cross off those days and weeks as you get closer and closer to that day.
