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I would argue it's definitely not a fad (at least in the sense it's something that's been happening only very recently); people have been fasting for literally thousands of years, though mostly for religious reasons.

It has an aura of being a fad nowadays since some modern research has indicated it actually does have health benefits, which I think some people have been a bit too quick to pounce on.

Yeah, I had some heavy quotes for that reason, I just couldn't think of a better name for it.. technique? Practice? Something like that.

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I would not call fasting a “health fad”. It has been practiced for centuries by various cultures and religions.

yes metabolisms can be very different