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Re:Exercise, fasting shown to help cells shed defective prot... by ams6110 on Tuesday February 26, 2019 @02:34PM (#19257561)
Not an expert but I would not think you would suffer much muscle loss in a short (less than 1 week) fast. It takes longer than that for your metabolism to transition into starvation mode. Maybe there's some risk if your body fat is already very low.
Re:Exercise, fasting shown to help cells shed defective prot... by SketchySeaBeast on Tuesday February 26, 2019 @03:05PM (#19257862)
> https://www.lifehack.org/389060/how-much-muscle-mass-can-you...

It looks like you can lost a fair amount of muscle mass, and that you lose the most muscle mass early, so 1 21 day fast would be better for you than 3 7 day.