noun
eating until 80% full; moderation in eating
A traditional Japanese dietary principle of stopping before feeling completely full, often phrased as 腹八分目に医者いらず (eating to 80% fullness keeps the doctor away).
健康のために腹八分目を心がけている。
I try to eat until I'm 80% full for my health.
腹八分目に医者いらず
There is a saying that eating to 80% fullness keeps the doctor away.