Here’s a great summary paper on the subject. It’s not just IF, but all diets and their relationship to longevity. It’s very hard to parse out whether it’s the window, or caloric restriction (CR). Kaeberlein says the evidence points to the most of the benefit being from CR. It’s very hard to do that research though to know for sure. If you want to get deep into the weeds, listen to Attia’s podcast with him. It’s episode #222. Their TL;DR: Exercise is way more important at preventing all cause mortality.
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