What 5 Days Without Food Does To Your Body (Day 3 is Incredible)

What happens to your body during a 5-day fast? Discover the benefits of fasting day by day, how to activate autophagy, support cellular repair and cleanup, plus fasting tips for maximum results.

0:00 Fasting day by day

1:03 mTOR fasting

1:57 Fasting day 1

2:26 Sodium while fasting

3:32 Day 2 fasting

5:10 Autophagy benefits day 3

7:47 Prolonged fasting benefits day 4

9:24 5 days of fasting results

10:26 Refeeding tips

11:17 Fasting contraindications

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A true fast offers many benefits and allows your body to shift into repair mode. During a fast, water, black coffee, and tea without sweeteners are generally acceptable.

One of the biggest fasting mistakes is not consuming enough sea salt. During a 5-day fast, aim for 1 to 1.5 teaspoons of high-quality sea salt spread throughout the day. Without adequate sodium, you may experience dizziness, fatigue, or keto flu symptoms.

To maximize the benefits of fasting and activate autophagy, keep mTOR low by avoiding protein, carbohydrates, and anything that significantly raises insulin. Walking is encouraged during a prolonged fast, but intense exercise such as weight training is best avoided.

On day 1, most people experience significant water weight loss and a rapid drop in insulin levels. Day 2 is often the most challenging, and many people quit before their bodies fully adapt to fat burning. Sea salt and MCT oil can help make the transition easier.

By day 3, autophagy begins to increase. Many people report improved mental clarity, reduced hunger, cellular cleanup, mitochondrial repair, and stem cell activation. Electrolytes become even more important at this stage, especially magnesium. Sun exposure and vitamin D are also beneficial.

As fasting continues, autophagy remains elevated while the body continues to target damaged cells, pathogens, liver fat, and visceral fat.

After a 5-day fast, many people experience a significant increase in human growth hormone, which may support muscle preservation, healthy aging, skin health, fat loss, and weight loss.

If you are pregnant, have diabetes, take medications, or have a medical condition, consult your doctor before fasting. If you are new to prolonged fasting, gradually work your way up before attempting a 5-day fast.

Dr. Eric Berg, D.C. Bio:

Dr. Berg DC, age 61, is a chiropractor who specializes in Healthy Ketosis & Intermittent Fasting. He is the Director of Dr. Berg Nutritionals and author of the best-selling book The Healthy Keto Plan. He no longer practices, but focuses on health education through social media.

Disclaimer:

Dr. Eric Berg D.C. 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, 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.

*Dr. Eric Berg, DC, is not AI-generated. AI-enhanced elements may be used in this video for production purposes only.