If humans can go weeks without eating, why do we eat 3 times a day?
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We don’t really need to eat 3 times a day. In fact we probably shouldn’t be, and there’s lots of research that supports this. Our hunter gatherer ancestors would have had occasional days without food, and the body is designed for this fact. There’s very conclusive research that demonstrates caloric restriction greatly increases the lifespan of lab mice (by around 40%!), and very likely in people too. There are biological process that are activated to allow the body to cope with harder times, in a similar that other stressors like exercise promote health benefits. When you think about it, the fact that we’re constantly in a fed state, 24/7, and that many of us have never really experienced true hunger, is a pretty weird thing, and probably not “natural”.
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