What Really Happens When We Fast?


What happens on the inside of your body when you’re fasting. There are a lot of beneficial effects of fasting on the body. Over a long period of time, the human body has developed and adapted to starvation. However, our bodies have not adapted to frequent eating.

What happens when we fast?

Effects of fasting after 12 hours—There is a spike in growth hormone.

Growth hormone is involved with:

 • Anti-aging

 • Fat burning

 • Healing joints

 • Protein synthesis

Effects of fasting after 18 hours—You develop autophagy.

Autophagy is involved with:

 • Recycling old and damaged proteins as well as microbes

 • Decreased amyloid plaquing

Effects of fasting after 24 hours—You really start to deplete your glycogen reserve and run on ketones.

Benefits of fasting after 24 hours:

 • Decreased hunger

 • Decreased cravings

 • Increased antioxidant reserve

 • Increased oxygen

 • Better fuel efficiency

 • Decreased inflammation

 • Gut healing

 • Improved cardiovascular function

 • Improved cognitive function

Effects of fasting after 48 hours:

 • Stimulate stem cells

 • Decreased risk of cancer/tumors

 • Make more mitochondria

Effects of fasting after 72 hours—Do periodically

 • More stimulation of stem cells

 • Better immune function

How to get these incredible effects of fasting:

 • Do intermittent fasting on a regular basis

 • A good average pattern of intermittent fasting is doing 18 hours of fasting with a 6 hour eating window

 • Do periodic prolonged fasting to achieve additional fasting benefits

 • Take minerals during fasting (water along with nutrients )

 • Exercise in the mornings

 • You may have increased LDL (This may not be something to worry about)

Dr. Eric Berg specializes in Healthy Ketosis & Intermittent Fasting. He is the author of The New Body Type Guide and other books published by KB Publishing. He has taught students nutrition as an adjunct professor at Howard University. He no longer practices, but focuses on health education through social media.


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