The Science of Fasting

Zack Lee said

This is an odd question. Does the science support that being in ketosis is an all or nothing thing as far as calorie intake? I’m curious if mints at less than 5 calories each will mess me up in the mornings

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I believe it's not about the calories. ANY calorie, even from a mint, technically breaks a water fast and interrupts autophagy. Will just that kick you out of ketosis? Probably not, but it can. And it can signal an insulin response and raise glucose making it harder to continue the fast, if that's what you want to do, by the body making you feel hungry again.