Take care of your stomach/body; moderation in eating and looking after one's health is important—an admonition to care for oneself.
夜遅くにたくさん食べるのはよくないよ。腹も身の内だからね。
It's not good to eat a lot late at night. Take care of your stomach—your body matters.
忙しくても休憩を取って食事をすること。腹も身の内だよ。
Even if you're busy, take breaks to eat. Look after your stomach and body.
暴飲暴食は避けよう。腹も身の内ということを忘れずに。
Avoid binge eating. Don't forget that you should take care of your body.