When you fast for more than 24 hours, you can lose weight quickly and preserve muscle mass. This video talks about how fasting affects IGF-1.
However, this video doesn't talk about the biggest problem with fasting, which is "re-feeding syndrome", which is the tendency to quickly regain weight in an unhealthy manner. If you fast, you should have a plan to break the fast properly and then be very careful about what you eat for several days afterward.
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