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Careful giving medical advice. Fasting can be dangerous in some cases.

The advice I got from my doctor is to start with 24 hour fasts. And then try 48 hours. And then probably stop there.

(I am not a medical expert)

A lot of intermittent fasters follow something less extreme: a 16:8 hour fast. You eat normally during an 8 hour window (lunch, a snack, and dinner, for example) and then don't eat for 16 hours (no after-dinner snacks and no breakfast).

Interesting - thanks for posting. The difference in cortisol is useful to know about.

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