The people of Okinawa, Japan only eat until they are about 80 percent full, then stop — and the practice has been linked in multiple peer-reviewed studies to lower rates of cardiovascular disease, slower biological aging, and a measurable extension of healthy lifespan, in one of the simplest evidence-backed longevity practices ever identified

There is a phrase that Okinawans of an older generation often murmur to themselves before sitting down to eat: hara hachi bu. The Chinese characters mean, more or less, “stomach eight parts,” and the full sense of the saying is “eat until your stomach is eigh…

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