Has intermittent fasting without calorie reduction/increase any deleterious side effects, aside perhaps on sleep, cortisol and gallstones?

I have read a fair amount of articles on intermittent fasting but aside from some perhaps negative side effects on sleep, cortisol and gallstones, all other deleterious sides effects I have read stem from calorie reduction/increase.

  • Seems unlikely it would be harmful given that intermittent fasting would have been a part of daily life for humans for 100s of thousands of years.
    – Carey Gregory
    Jan 1, 2020 at 1:02


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