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ideal fasting length

hi all, I’m curious what you guys have seen as an ideal fasting length, to cut fat and preserve muscle. I’d seen Dr. Jason Fung mention that after 15 days or so the metabolic rate slows down, but that up until then the metabolic rate actually rises slightly. Goal is to spare/grow muscle, and burn fat. So what fasts have you guys found to be most effective? I’ve tried rolling 3 day fasts, alternate day fasts, OMAD, two 15 day fasts and one 28 day fast. I found the shorter fasts to be more effective. What about you guys?

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Answer

When your body is deep in ketosis, you use fat and proteins for energy in similar proportions. It’s very common to lose muscle mass during long fasts. If you want to preserve or even build muscle, you need to make sure your body is constantly supplied with protein. I would avoid fasts longer than 24 hours unless you want to deal with some muscle loss.

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