Prolonged Fasting and IGF-1

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How does prolonged fasting affect IGF-1? Watch this video to find out.

0:00 What is IGF-1?
0:30 Benefits of IGF-1
0:53 IGF-1 and cancer
1:54 Prolonged fasting and IGF-1
3:37 Is prolonged fasting harmful?
4:09 Benefits of prolonged fasting
4:42 Need a keto consultant?

In this video, we’re going to talk about prolonged fasting and IGF-1. IGF-1 stands for insulin-like growth factor 1. This is a hormone that is made in the liver. This hormone is stimulated by growth hormone, and it acts like growth hormone in the body.

Growth hormone is made by the pituitary gland—it is transported to the liver, where it triggers IGF.

IGF-1 is vital to the growth and development of tissue in the body—just like growth hormone.

If you do prolonged fasting, insulin goes down, and IGF-1 increases to immobilize fat to be used as fuel.

Interestingly, some research shows a correlation between high IGF-1 and increased risk of cancer. IGF-1 is not the sole cause of cancer—it’s only involved in cancer in the way that it helps things grow. It also inhibits apoptosis (programmed cell death), which is an important function in cancer prevention.

Fasting for 3-5 days causes a 30% decrease in IGF-1. This increases the immune system, decreases inflammation, and boosts neuroregeneration.

Fasting for longer than 5 days lowers IGF-1 by 60%, which helps reduce the risk of cancer, diabetes, and overall mortality.

Prolonged fasting is not harmful or dangerous if you do it correctly. In fact, it can help increase your health and improve the survival of your cells.

Dr. Eric Berg DC Bio:
Dr. Berg, age 55, 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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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. The Health & Wellness, Dr. Berg Nutritionals and Dr. Eric Berg, D.C. are not liable or responsible for any advice, course of treatment, diagnosis or any other information, services or product you obtain through this video or site.

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Thanks for watching. I hope this video enlightened you on the benefits of prolonged fasting and the effects of IGF-1. I’ll see you next time!
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