Modified Fasting 101: The Ultimate Beginner’s Guide

Q: 9. Are alcohol and coffee off-limits during a modified fast? What about decaf?

Don’t compromise your results by drinking caffeine or coffee (even decaf coffee) during your modified fast. Not only is coffee dehydrating, but it’s incredibly acidic and can undermine your results significantly. You’ll also want to eliminate alcohol from your diet during the fast, since it will tax your liver and make it harder to flush toxins and fat stores.

Q: 10. Can I exercise during a modified fast?

Yes! Most people find that they prefer workouts that are lighter or less intense while fasting, but you should feel free to listen to your body and stay as active as you wish. If your body tells you to slow down a little, be willing to respond accordingly — after all, you’re doing a lot of unseen work during your fast!

Robyn Openshaw - Updated: June 24, 2024 - - This Post May Contain Affiliate Links

Photo of vanilla smoothie with straw and scoop of protein from "Modified Fasting 101: The Ultimate Beginner’s Guide" by Green Smoothie Girl

If you’re like most people, the idea of going without food for a day — or even longer — doesn’t sound very sexy.

But unless you’ve been living under a rock, you’ve probably heard about the incredible health benefits of fasting.

Maybe you know that in 2016, the Nobel Prize for Medicine was awarded for new research that revealed exactly why fasting is so powerful¹ (more on that below!).

So what if I told you that it was possible to get the benefits of fasting without going hungry (or getting hangry)?

Intrigued? You should be! Let’s talk about modified fasting.

In this article:

What Is Modified Fasting?
How Does Modified Fasting Work?
Frequently Asked Questions About Modified Fasting
The Unique Benefits of Modified Fasting
Advantages of a Modified Fast vs. Longer Fasts
Tips for a Successful Modified Fast
Conclusions about Modified Fasting

What Is Modified Fasting?

Modified fasting is a type of intermittent fasting² that gives you a budget of 600-800 calories a day, for three or more days, and restricts eating to an 8- to 12-hour window.

Of course, those calories can’t come from DingDongs. You need a power-packed, plant-based meal plan that includes the right balance of carbohydrates, protein, fat, and micronutrients (more on that in a minute, too).

In the recent past, a lot of experts argued that fasting had to be strict (no calorie intake whatsoever) to be most effective. However, a tidal wave of human and animal clinical studies, as well as new breakthrough research from Valter Longo, PhD, shows that modified fasting yields the same health benefits of a zero-calorie water fast,³ including weight loss, mental clarity, reduced inflammation, and cellular renewal and repair.

How Does Modified Fasting Work?

In 2016, Japanese biologist Dr. Yoshinori Ohsumi won a Nobel prize for discovering a very specific cellular repair process called autophagy.¹

And that strange-sounding little word is the reason that fasting (including modified fasting) is so effective. The word “autophagy” is a combination of the words “auto” (self) and “phagy” (eating). In other words, “autophagy” literally means “self-eating.”

See, your body is a true marvel of design. When calorie consumption cuts off or stays below that magic 800-calorie mark (including during sleep, while you’re sick, or when you're intentionally fasting), your system starts recycling its own cells, literally destroying and consuming damaged or dying cells to make way for new, healthy cells.

Your body also attacks fat cell accumulations as the least needed, cancerous growths we all have, along with viral and bacterial cell clusters that could make us sick. Basically, freed from having to break down food all day every day, the body goes to work repairing.

Your miraculous, self-regulating body, in a fasting state, goes into Marie Kondo mode, clearing out whatever doesn't serve you.

It’s the reason our need for sleep has as much to do with fasting as it does REM cycles. It’s also the reason we intuitively cut WAY down on calories when we’re feeling really sick.

Photo of Green Smoothie Girl Modified Flash Kit and Booklet from "Modified Fasting 101: The Ultimate Beginner’s Guide" by Green Smoothie Girl

Modified fasting is a great way to capitalize on the natural benefits of autophagy.

Frequently Asked Questions About Modified Fasting

If you have a lot of questions right about now, you’re not alone. The internet, the blogosphere, and the publishing world have exploded with information about fasting — intermittent fasting, water fasting, time-restricted eating, and others.

So, what makes modified fasting so great? How is it different from intermittent fasting? What advantages does it have over a longer fast, or a water-only fast? Can you really lose weight (and how much)? How often should you do it? What should you eat and drink? What should you be eating afterward?

I’ve got you covered.

1. What's the optimal amount of time to fast?

When it comes down to it, the optimal amount of time to fast is the amount of time a person can realistically spend in autophagy, considering both physical and mental factors. (In other words, you’ve still got to do life — and that has to factor into your fasting plans.)

While a week-long, zero-calorie water fast is fantastic for your health, it’s not realistic for most people with a busy work schedule and family life. Based on my research, a three-day modified fast is the right mix of doable and highly impactful for your health. I find that people fall off and feel like a failure when they attempt 5 days of modified fasting, but virtually everyone finishes strong with 3 days.

2. Is a modified fast better than a water-only fast? What about juice fasts, or dry fasts?

It’s easy to get confused by the sheer number of options for different fasting types. And I’m not here to knock any of them. A water-only fast (zero calorie intake, only water to drink) is wonderful for your health, but very difficult for most people to maintain.

A juice fast has a lot of benefits (and gives you an incredible boost of micronutrients), but autophagy doesn’t kick in nearly as quickly as it does other types of fasting.

And a dry fast (neither water nor food allowed!) can really only be done for one day, max, to avoid some serious health issues related to dehydration.

A modified fast of 3 days feels doable for most people, offers the same health benefits of a water-only fast, and is compatible with real life.

3. How does modified fasting differ from intermittent fasting or time-restricted eating?

Modified fasting is a type of intermittent fasting and includes some time-restricted eating.

A 12-hour feeding window is basic common sense for good health. This is something we should be practicing all year long and doesn’t quite qualify as fasting. For autophagy to really kick in, a modified fast of 600-800 calories is needed, in addition to maintaining an “eating window” of 8-12 hours each day during the modified fast.

Throughout history, people have limited their “eating window” from 7 am to 7 pm or even shorter; the modern American phenomenon of eating all day and even into the night is a product of cheap, easily available food.

4. Isn’t five days better than three days of fasting?

Based on my own research, a three-day window of modified fasting is simply more doable for the vast majority of people. And that three-day window is enough time for your body to do some serious work in autophagy, clearing out damaged cells, reducing inflammation, and improving so many markers of good health.

If you want to extend your fast to five or six days, all the better! But I find that people who set out with a specific goal of five days, instead of three, have high dropout rates. Three days seems to be the magic number for a doable, realistic fast that doesn’t interfere with your social life.

5. How much weight can you lose with modified fasting?

Our first group of modified fasters (who used my Flash Fast program, which included three days’ worth of organic, prepared mini-meals), lost an average of 4 pounds in 3 days. Think about what that means over the course of a year:

If you did a (modified) Flash Fast every month, that’s a possible 48-pound weight loss in one year, even changing nothing else in the year-round diet.

6. How do you start a modified fast?

It’s really simple.

Choose three days in a row.
Plan your plant-based, nutrient-dense meals to total 650-800 calories per day.
Eat within an 8-12 hour window each day.

Your satiety level will be the best if your plant-based diet is higher in protein than most vegan diets. Our first 100 beta testers of the Flash Fast reported an average highest hunger level of 3.4 on a 1 to 10 scale!

7. What should you eat and drink during a modified fast?

Liquids appropriate for a modified fast include lemon water, organic herbal tea, celery juice, and good old fashioned filtered water.

I recommend including 13 grams of protein, four times per day, during the fast, as well as good omega fatty acids from flaxseed or hemp seed. You may wish to include raw greens, plus steamed vegetables or a piece of fruit. Your total intake of calories should not exceed 800 calories daily to stay within what is known, from the published clinical research, to support the benefits of fasting while still eating.

If you plan your own menu for a modified fast, take special care to include plenty of micronutrients from organic sources.

You can also use the Flash Fast kit, which has all the food you’ll need for three days (and allows for unlimited greens blended into your shakes, or eaten without oils added, and some non-starchy veggies or one serving of fruit is also allowable as additions, keeping you under 800 calories).

8. Should men and women do modified fasting differently?

As of this time, no one has done a study to prove or disprove that men can eat more than women during modified fasting and still gain all the autophagic and ketotic health benefits. So, to be true to the published studies, I can say only 800 calories or fewer for both genders. If I learn of any new evidence that men can follow different guidelines than that, I will update this blog post.

9. Are alcohol and coffee off-limits during a modified fast? What about decaf?

10. Can I exercise during a modified fast?

11. What should I eat after a modified fast?

What you eat after a fast is important. When “refeeding” your body after a fast, you’ll be fueling new cell growth as your body rebuilds the “broken parts” stripped down by the process of autophagy.

You’ll want to eat plenty of organic fruits and vegetables, non-gluten whole grains, legumes, nuts, seeds, and only very small portions of wild-caught, free range, or grass-fed animal products (if you choose to eat any animal products at all). Avoid dairy, processed food, stimulants like caffeine, and artificial flavorings and other chemicals.

12. How often can I do a modified fast without slowing down my metabolism?

Modified fasting can be done up to weekly without fear of lowering your metabolism.⁴ For those with significant health challenges or who have a lot of weight to lose, you can safely fast once per week (meaning three days out of every seven).

Our ancestors were incredibly familiar with food scarcity, and most humans around the globe, until about 100 years ago, had long periods of time with only one or two meals per day. (In fact, as strange as this may seem to North Americans, many indigenous cultures around the world currently eat one or two meals a day.)

Our bodies know just how to take advantage of those conditions! While modern society offers us food 24-7, making the choice to fast regularly is one of the smartest things you can do for your health.

13. Is there anyone who shouldn’t do a modified fast?

The great thing about a modified fast of three days is that it’s accessible for a lot of people for whom fasting generally isn’t a great option, including older adults.

Water fasting isn’t recommended during pregnancy or the first few months of exclusive breastfeeding, or for people who have an eating disorder, hypertension, diabetes, kidney disease, or heart disease.

People in cachexia (muscle wasting) from stage IV cancer should consult their physician, but even modified fasting is usually contra-indicated in this situation.

When in doubt, talk with your trusted functional medicine doctor about whether a modified fast is right for you.

14. Should I be worried about muscle loss during modified fasting?

No! It’s a common myth that the body will start metabolizing muscle as soon as you enter a fasted state. You’d have to fast for quite a long time for that to happen. During a fast, your body will use up your fat stores ⁴(that’s a big reason they exist, to get you through a famine!) and break down damaged bits of protein and cells for fuel (autophagy). During a modified fast, you’ll also be eating enough protein and micronutrients to maintain muscle tissue.

Photo of woman stirring GreenSmoothieGirl chocolate plant protein powder into glass of water from "Modified Fasting 101: The Ultimate Beginner’s Guide" by Green Smoothie Girl

Your fat stores get used up while fasting, not muscle. In fact, our protein powders help your muscles keep building!

15. Are there any challenges I should prepare for?

Many people experience something called “Herxheimer reactions” during a fast, as toxins that have been tucked away in your fat tissue flood through your organs on their way out of your body. You might experience headaches, digestive issues, or other brief symptoms. Know that this is normal, and actually, it's a good sign of how much your body needed to detox. Keep drinking water to help flush these toxins out, and consider a coffee enema to help speed up the process.

16. What kind of health benefits should I expect to see from modified fasting?

This is the most important question, and I’ve saved it for last because it deserves its own section, up next! Here's the short version when it comes to the health benefits of modified fasting:

allows your body to burn abdominal fat stores for weight loss
recycles damaged cells
triggers cellular regeneration
triggers human growth hormone and stem cell production
boosts the immune system
improves memory and cognition
slows bone loss
increases life span
fights tumor growth
reverses fatty liver syndrome
decreases overall cholesterol and blood pressure
decreases overall inflammation
balances the hormone (endocrine) system
regenerates the myelin sheath, preventing Multiple Sclerosis, Alzheimers, Parkinson’s, etc.
breaks down cancerous growths
helps reverse metabolic syndrome

. . . and the list goes on!

The Unique Benefits of Modified Fasting

The benefits of modified fasting³ are right on par with the benefits of water fasting. And most importantly, these benefits are accessible and doable for the average, busy person.

Fasting Compatible with Modern Life

I can tell you right now that water fasting isn’t easy. There’s a reason that I (and others) attend fasting clinics instead of staying at home with easy access to the refrigerator!

Modified fasting, on the other hand, requires zero white-knuckling and can be done while traveling, caring for children, working, and everything else that's part of your everyday life.

If you feel up to a water-only fast or a longer modified fast, I’m your biggest cheerleader. But for those of you who think “there’s no way I could fit an extended water fast into my life,” modified fasting is an amazing choice.

Photo of hand putting a GreenSmoothieGirl Blend Bar into a black purse from "Modified Fasting 101: The Ultimate Beginner’s Guide" by Green Smoothie Girl — You can do a modified fast up to once a week.

Doable, Non-Threatening, and Easy

Going completely without food for any stretch of time isn’t doable for most people. But a very specific, low-calorie fast on the other hand? That’s manageable.

Especially given that the research shows eating an optimized, low-calorie (650-800 calories, to be exact) diet during a short-term fast yields the same benefits of a water-only fast—along with being far more doable.

You won’t even be particularly hungry.

Modified fasting basically lets you have your carrot cake and eat it too. (Or at least your carrot. No cake. Sorry.)

Cell Repair and Waste Management

Even if you’re eating a mostly raw, nutrient-dense diet, your body is still working hard to run damage control on waste buildup and cellular damage that comes from oxidative stress, the chemical load in your environment, and even normal biological processes like digestion.

Fasting cuts down on the enormous amount of energy required for digestion and opens the door for cell repair and waste removal.⁵

It’s one of the reasons we need sleep so much when we’re sick or stressed out: to give our bodies a chance to manage repairs and waste removal without the burden of actively digesting a full load of calories.

During a modified fast, you’ll choose an 8-12 hour eating window (during which you’ll consume all of your 5 daily mini-meals) to allow your body plenty of time to rest from digestion and spend the maximum amount of time in autophagy.

Reduced Inflammation

A modified fast can significantly lower inflammation and oxidative stress.⁶

On an average day of digestion, your mitochondria (the energy-production centers in your cells) process quite a bit of glucose from the food you eat, which inevitably creates byproducts known as free radicals (unstable molecules that cause cell and organ damage), as well as cells called monocytes, which trigger inflammation.⁷

The average person’s basal metabolic rate is between 1400-1600 calories per day (that’s how many calories you burn during a given day just by being alive). During a modified fast, you’ll be eating significantly fewer calories, significantly less glucose, and producing significantly fewer free radicals and monocytes during digestion.

Many people with inflammatory conditions like arthritis, Crohn’s, irritable bowel syndrome, and psoriasis⁸ notice improvements during and after a fast for this reason.

Flush Toxins and Chemicals

The average person is exposed to around 80,000 different chemicals in the air, food, and water.⁹ And you’d better believe that chemical load has an impact.

Our bodies are amazingly adept at protecting us from the harmful effects of those chemicals, by tucking them away in fat stores¹⁰ where they can’t damage our organs. But in modern society, it’s difficult for our bodies to keep up with the number of chemicals in the plastics, metals, drugs, food, air, and water we interact with on a daily basis.

Disease is the direct result of chemical overload, and fasting can be a literal lifesaver in helping our bodies play catch-up with a chemical-saturated environment.

Weight Loss and Reduced Fat Marbling in Organs

Modified fasting is one of the easiest, most effective ways to lose weight (especially abdominal fat!) quickly.⁴ The average person who participated in my Flash Fast program lost 4 pounds in three days.

And no, that’s not just “water weight.” During autophagy, your body goes after fat stores first — particularly abdominal fat stores — ³ along with recycling and destroying damaged tissues and cells for fuel.

Fasting also helps improve fatty liver syndrome,²⁵ which results in fat marbling you can’t see in your liver and other internal organs. Fatty liver syndrome puts a big strain on blood circulation and hurts your liver’s ability to flush toxins and chemicals from your body.

Improved Mood and Brain Health

New research shows that fasting (including modified fasting!) can be as effective as antidepressants¹¹ in improving mood and mental health. Many researchers believe that the process of autophagy in the brain’s neurons is responsible for the findings.

Other studies show that temporary calorie restriction through modified fasting boosts brain-derived neurotrophic factor¹²(which in animal studies helps protect neurons in the brain against damage, stress, and dysfunction from neurodegenerative disorders), as well as encouraging the growth of new neurons. Regular fasting in mice produces new nerve growth in the hippocampus (the place we create new memories), as well as improved cognition.

Protects and Restores Nerve Cell Function

Nerve cells rely on a special kind of insulation, called a myelin sheath, to properly communicate with each other. The condition Multiple Sclerosis (MS) develops as these myelin sheaths erode, making it difficult and ultimately impossible for nerves to carry information and communicate with each other.

No drug on the market has been able to successfully restore these myelin sheaths. But as it turns out, fasting can do what drugs can’t. One clinical trial showed that fasting can reverse damage from Multiple Sclerosis ¹³to the fatty tissues that protect and insulate nerve cells, actually helping rebuild the myelin sheaths.¹⁴

Photo of open Flash Fast Box with produce and striped hand towels from "Modified Fasting 101: The Ultimate Beginner’s Guide" by Green Smoothie Girl — There are so many benefits to fasting for your mind and body.

Immune Boost and Protection Against Disease

Fasting provides a significant immune boost, partly because during autophagy, your body is actively scavenging for damaged, mutated, or low-functioning cells, and partly because a fast helps reset important metabolic and neurological pathways. When those pathways are working effectively, your microbiome, enzymes, and hormones can more effectively flush toxins, repair damage, and convert food into energy.

A study in 2019 showed that fasting mice were able to destroy pathogens in about two days,¹⁵ while their well-fed counterparts took an entire week to do the same thing. And a 2014 study showed that fasting causes dormant stem cells involved in immune functions to regenerate.¹⁶

Research shows that fasting can help animals recover from bacterial infections¹⁷ more quickly. It’s also been shown to improve cardiovascular health, diabetes, neurodegenerative conditions, autoimmune diseases, and even cancer.

It turns out “starve a fever, feed a cold” is a little misleading. You should starve a cold, too! The immune system becomes strong and energized to metabolize the viral or bacterial colonies, helping you get well quickly and avoid longer-term consequences like pneumonia or deep respiratory congestion.

Longer Lifespan

Numerous studies show how fasting and intermittent calorie restriction increase lifespan in animals from mice to chimpanzees.¹⁸

And while there aren’t any conclusive human studies, scientists are confident that these principles apply to people, too.

When you look at all of the different health benefits of fasting (cell repair, waste management, immune health, lowered inflammation, and better mental health), it’s no wonder!

Advantages of a Modified Fast vs. Longer Fasts

While a shorter fast is obviously more doable and compatible with a busy modern life, there are a few other important advantages to consider as well.

Basically, there’s no need to feel like you’re selling yourself short or “taking the easy way out” by fasting for shorter periods of time on a regular basis, rather than all at once during a strict water-only fast. Here’s why!

No Risk of Muscle Wasting

While your body can easily go for long periods of time without consumed fuel (several weeks, actually), it can’t run on fat stores alone. Your brain relies heavily on glycogen to function.²³ During water-only fasts that last up to three days, your body can rely on stores of glycogen in the liver, combined with fat stores. However, longer fasts without any other food force the body to start breaking down muscle tissue/protein for glycogen. Shorter modified fasts of 3-5 days won’t dip into muscle stores for that precious glycogen!

Maintains a Healthy Metabolism

A longer water-only fast can slow down your metabolism, since your body will be working to conserve energy. There’s no long-term harm from this, as long as you don’t do water fasts regularly. However, one of the advantages of a shorter modified fast is that it can be done much more regularly without fear of slowing the metabolism.⁴

Avoids Complications of Refeeding Syndrome

Longer, water-only fasts can, in rare circumstances, result in a dangerous condition known as refeeding syndrome.²⁴ This syndrome is caused by a sudden influx of calories that leads to a drastic imbalance in electrolytes in the body. In very rare situations, refeeding syndrome can be deadly.

While it is important to re-enter a normal diet after fasting with special care to nutrients and organic foods, there’s no risk of refeeding syndrome after a shorter, modified fast.

Flexibility and Compatibility with Daily Life

I can tell you from personal experience that it’s very difficult to undertake a water-only fast without serious focus (and sometimes isolation). A modified fast allows you to stay social and keep up with work and everyday activities (like making dinner for your family), without calling it quits on your fast or feeling overwhelmed.

Tips for a Successful Modified Fast

While fasting for three days is doable for most people, you’ll have the very best chance of success if you keep the following tips in mind:

Stay Hydrated

While you’re fasting, your body will be working hard to flush toxins and waste from your system more aggressively than usual. That means you’re going to go through electrolytes and liquids more quickly. Stay hydrated, and keep your electrolyte levels high by spreading your mini meals out evenly throughout the day. If you feel light-headed, or have a headache, sip on some lemon water or celery juice, which are low- or zero-calorie but rich in electrolytes.

Listen to Your Body

Listen to your body’s signals during a fast! Rest as needed, plan plenty of time for high-quality sleep, and don’t panic if you notice some of those Herxheimer reactions we talked about earlier. Headaches and tiredness early on in the process are very normal, and they will pass. Your body is doing important work!

Find Your Cheerleaders

A support group can make all the difference to success by helping you find answers to questions that may arise during a modified fast.

Conclusions About Modified Fasting

The research is in, and there’s no doubt that fasting is one of the most important health discoveries of this century.¹ In a modern world filled with chemicals, processed food, and 24/7 snacking, fasting gives our bodies a chance to “take out the trash,” as well as renew, rebuild, and recycle damaged cells.

Modified fasting makes the benefits of fasting accessible to almost anyone, in a way that’s compatible with real life. Whether you’re interested in losing weight, clearing out damaged cells and toxins from your body, fighting disease, reducing inflammation, or improving your mental health, modified fasting is one of the best things you can do for your health.

Listen Next: Vibe Episodes 146 & 147: How To Get The Remarkable Benefits of Fasting--Without Going Hungry!” With Robyn Openshaw

Robyn Openshaw, MSW, is the bestselling author of The Green Smoothies Diet, 12 Steps to Whole Foods, and 2017’s #1 Amazon Bestseller and USA Today Bestseller, Vibe. Learn more about how to make the journey painless, from the nutrient-scarce Standard American Diet, to a whole-foods diet, in her free video masterclass 12 Steps to Whole Foods.

Disclosure: This post may contain affiliate links that help support the GSG mission without costing you extra. I recommend only companies and products that I use myself.

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