Proven Benefits of Prolonged Fasting

7 Critical Things You Need to Know about Fasting

Dr. Eric Berg DC

Discover how a multi day water fast can lower insulin, trigger deep cellular clean up, and support fat loss when done correctly and safely under expert guidance.

Prolonged fasting in this video refers to water only fasts of roughly 72 hours or longer and explains why simply not eating for a defined period can be more powerful for healing than constantly snacking. The speaker contrasts the metabolic damage caused by frequent snacks with the regenerative benefits of fasting, then walks through seven practical rules for doing a longer fast, including what you can drink, why electrolytes are essential, how to avoid dangerous refeeding problems, and when to push through discomfort versus when to stop. Along the way he introduces the concept of autophagy, highlights its potential role in cancer and chronic disease, and stresses using a nutrient dense low carb diet between fasts rather than returning to junk food.

Summary

• Prolonged fasting is presented as a powerful healing tool that counters the harmful effects of frequent snacking on insulin, weight, energy, and mood.
• The video cites historical advocates of fasting and explains that fat is an efficient survival fuel created for periods of food scarcity, which we can safely “mimic” through controlled fasting.
• Seven key guidelines are outlined: limit intake to water, tea or coffee, and supplements, emphasize electrolytes and B vitamins, refeed very gradually with low carb whole foods, avoid apple cider vinegar on longer fasts, use a healthy ketogenic diet after fasting, understand the dawn phenomenon, and learn when to break the fast.
• Autophagy is described as the body’s self cleaning mode that recycles damaged proteins, helps clear mitochondrial damage, reduces inflammation, and may support better outcomes in conditions like cancer and autoimmune disease.
• The speaker warns about electrolyte loss during fasting, the dangers of refeeding with sugar and large meals, and special cautions for pregnancy, lactation, anorexia, and other health conditions.
• He explains that during a prolonged fast the body switches from burning glucose to fat and ketones, and that initial brain fog or discomfort often improves once ketone production ramps up.
• Practical tips include drinking at least about 2.5 liters of water, using sea salt and other electrolytes to prevent weakness and heart issues, possibly using MCT oil or ketone supplements for mental clarity, and using walking or nutrients like berberine or cinnamon to help with insulin resistance.

Video description

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Prolonged fasting has a lot of incredible benefits. Here’s what you really need to know before giving it a try.

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0:00 Introduction: Understanding fasting vs. snacking
3:03 What great thinkers have said about fasting
3:52 Fasting vs. starving
5:30 Critical things you need to know about prolonged fasting
18:33 Learn how to make insulin more sensitive!

Today, I’m going to share seven critical things you need to know about prolonged fasting. Fasting is very simple yet very powerful.

Snacking is one of the worst things for your insulin and your overall health. Food is nourishing, but to heal your body, you might be better off not eating.

Snacking causes hunger, weight gain, fatigue, and moodiness—among other potential health problems. Yet, simply not eating can create so many powerful health effects.

Throughout history, many great thinkers, including Hippocrates and Plato, have even had positive things to say about fasting.

Seven critical things you need to know about prolonged fasting (72 hours or longer):

1. Only drink water (2.5 liters), tea, and coffee—and take supplements (electrolytes, B vitamins, vitamin D, and vitamin C).
2. Take electrolytes (including sea salt).
3. Go very slow and gradual when refeeding, and avoid carbs, sugar, and a large meal.
4. Don’t take apple cider vinegar.
5. Do Healthy Keto when you break your fast.
6. Understand the dawn phenomenon (your liver is making sugar due to insulin resistance).
7. Know when to break your fast (don’t stop when it’s uncomfortable—push through the transition phase).

Dr. Eric Berg DC Bio:

Dr. Berg, age 57, is a chiropractor who specializes in Healthy Ketosis & Intermittent Fasting. He is the author of the best selling book The Healthy Keto Plan, and is the Director of Dr. Berg Nutritionals. He no longer practices, but focuses on health education through social media.

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Disclaimer: Dr. Eric Berg received his Doctor of Chiropractic degree from Palmer College of Chiropractic in 1988. His use of “doctor” or “Dr.” in relation to himself solely refers to that degree. Dr. Berg is a licensed chiropractor in Virginia, California, and Louisiana, but he no longer practices chiropractic in any state and does not see patients so he can focus on educating people as a full time activity, yet he maintains an active license. This video is for general informational purposes only. It should not be used to self diagnose and it is not a substitute for a medical exam, cure, treatment, diagnosis, and prescription or recommendation. It does not create a doctor patient relationship between Dr. Berg and you. You should not make any change in your health regimen or diet before first consulting a physician and obtaining a medical exam, diagnosis, and recommendation. Always seek the advice of a physician or other qualified health provider with any questions you may have regarding a medical condition.

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Thanks for watching! I hope this helps explain the seven critical things to know about fasting. I’ll see you in the next video.

Transcript Summary

Why fasting beats snacking

The speaker opens by emphasizing that prolonged fasting is simple but extremely powerful, and that you can only grasp its benefits by comparing it with its opposite snacking. He argues that frequent snacking creates a chronic elevation in insulin that drives weight gain, fatigue, hypoglycemia, mood swings, and an eventual slowdown in your ability to lose weight. Contrary to the belief that you need to eat often to heal, he suggests that not eating for set periods allows the body to repair more effectively than constant food intake.

Historical perspective on fasting and the purpose of body fat

He then highlights that great thinkers like Hippocrates, Pythagoras, Plato, Aristotle, Benjamin Franklin, and Mark Twain all endorsed some form of fasting for clearer thinking or better health. From there, he explains that body fat evolved as an efficient way to store fuel during times of food scarcity, so an “efficient metabolism” in obesity really means the body can run on very little food while preserving fat. The practical takeaway is that to lose fat you must mimic the conditions under which fat was created by voluntarily withholding food rather than trying to eat your way out of it.

Fasting versus starving

The difference between fasting and starving is framed as a matter of control: in fasting, you could eat but choose not to, whereas in starvation the environment prevents you from accessing food. He argues that by choosing prolonged fasting you harness the body’s survival design in a controlled way to tap into fat stores and trigger beneficial adaptations. This sets up the case for using prolonged fasting, rather than simply calorie cutting or snacking less, as a targeted health strategy.

Rule 1: What to consume during a prolonged fast

Moving into the seven critical points, he first states that during a prolonged fast you should drink water, tea, and coffee, but no caloric snacks or branched chain amino acids. Because modern diets often leave people depleted of nutrients, he recommends using supplements, especially electrolytes and B vitamins, and optionally vitamin D and vitamin C, to prevent deficiencies as the body adapts. He notes that fasting is the most potent trigger of autophagy, a self cleaning process where the body recycles damaged proteins and cellular components, so eating small amounts repeatedly can blunt this effect.

Autophagy, cancer, and inflammation

Autophagy is described as a condition in which the body recycles old, damaged proteins including amyloid plaques associated with neurodegenerative disease and other protein deposits implicated in chronic illness. He links this process to the clean up of damaged mitochondria and suggests that this may address some underlying drivers of cancer, which is why he views prolonged fasting as a powerful tool against cancer and chronic inflammation. He also claims that prolonged fasting can erase inflammation and be extremely helpful for autoimmune conditions by systematically clearing out damaged proteins across tissues and metabolic pathways.

Rule 2: Hydration and electrolytes

Next he recommends drinking at least about 2.5 liters of water per day during a water fast, noting that while the body can make some “metabolic water” by burning fat, you still need to drink to protect health. When fasting you rapidly dump glycogen and the water stored with it, which produces a large fluid loss and corresponding loss of electrolytes like sodium, potassium, magnesium, and calcium. He warns that fasting without replacing electrolytes, including sea salt, can lead to muscle weakness, fainting, heart rhythm problems, and even heart attacks, so salt and electrolytes are essential rather than optional.

Rule 3: How to break a prolonged fast safely

For refeeding after 72 hours or more of fasting, he stresses that you should not break the fast with a huge meal or refined carbohydrates and sugar. Doing so can cause a rapid shift of potassium out of cells as your body tries to store glucose again, creating a serious electrolyte imbalance that may be dangerous. Instead, he advises starting with small portions of simple whole foods such as salad, egg, nuts, or avocado, spacing them out over a few hours and gradually increasing intake to allow the body to readjust.

Rule 4: Apple cider vinegar and acidity

He cautions against using apple cider vinegar during prolonged fasts longer than about 72 hours because fasting already increases ketones and acidity. Adding more acid may disturb pH balance and contribute to symptoms like pounding pulse in the ears, difficulty sleeping, air hunger, or gout flare ups from elevated uric acid. For people prone to gout or heavy ketone production he suggests a small amount of baking soda in water to buffer acidity, noting that this is usually only an issue early on or in sensitive individuals.

Rule 5: Healthy keto after fasting

When you resume normal eating, he recommends following a “Healthy Keto” diet instead of returning to high carb or junk food patterns that caused metabolic problems in the first place. The goal of fasting is to reverse the effects of a high carbohydrate, ultra processed diet, so going back to those foods will undo much of the benefit. He encourages combining intermittent fasting with a nutrient dense, low carb way of eating to maintain improvements gained from longer fasts.

Rule 6: The dawn phenomenon and insulin resistance

He then explains the dawn phenomenon, where blood sugar rises in the early morning even when you have not eaten. This rise occurs because the liver is making sugar in the context of existing insulin resistance, and he notes it can take months to a year or more for insulin resistance to fully resolve even with fasting. He advises not to panic or abandon fasting if morning glucose briefly rises, and suggests long walks or compounds like berberine and cinnamon as ways to help lower insulin resistance over time.

Rule 7: When to break the fast and adapting to ketones

Finally, he addresses how to know when to break a fast and how to handle the adaptation period when switching from glucose to fat and ketones as primary fuel. People new to fasting may experience hunger, brain fog, or feeling “off” while the body upregulates enzymes for fat and ketone use, especially in the brain, which cannot burn fatty acids directly. He notes that some people use MCT oil or exogenous ketone supplements to ease symptoms, but emphasizes that if you push through the temporary discomfort your appetite often drops, mental clarity improves, and you reach a stable adapted state. He distinguishes intermittent fasting from prolonged fasting by saying that in longer fasts you may choose to push past hunger signals, whereas in intermittent fasting he usually advises eating when truly hungry.