The Japanese have an expression, hara hachi bu, which means, roughly speaking, “belly 80 percent full.” Hara hachi bu is shorthand for an ancient injunction to stop eating before feeling full. Nutritionally, the command makes a great deal of sense. When people eat, their stomachs produce peptides that signal fullness to the nervous system. Unfortunately, the mechanism is so slow that eaters frequently perceive satiety only after they have consumed too much—hence the all-too-common condition of feeling bloated or sick from overeating.
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