What is the Sunnah's teaching about moderation in eating?

The Prophet ﷺ taught that a person fills no vessel worse than their own stomach, and that it is enough for a human being to eat a few mouthfuls to keep their back straight — but if more is truly needed, a third of the stomach should be for food, a third for drink, and a third left for breathing and ease. This was not a strict medical formula so much as a call against habitual overeating, which the Prophet's own lifestyle modeled: simple meals, eating with gratitude, saying Bismillah beforehand, eating with the right hand, not criticizing food he disliked, and stopping before feeling completely full. This teaching sits alongside the Quran's broader command against excess in eating and drinking, forming a consistent Islamic health ethic centuries before modern nutrition science began emphasizing portion control and mindful eating. Practically, it's a useful mental checkpoint at any meal: eat to nourish and enjoy, not to reach the point of discomfort.

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