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I hear this is a very dangerous game if taken to an extreme. You have to be very disciplined once you take it beyond 3 days. David Blaine did it for 44 days and

• vl 5y ago
  Professional athletes cut for several days quite often. It’s well researched area. But better way for regular people is just do OMAD. You get used to it after first three days, which are brutal. So, strong motivation is required, but still easier than real cut for bodybuilders or fighters.