Hadithcore
Riyad as-Salihin, 515

Miqdam bin Ma'dikarib (May Allah be pleased with him) reported:

I heard Messenger of Allah (ﷺ) say: "No man fills a container worse than his stomach. A few morsels that keep his back upright are sufficient for him. If he has to, then he should keep one-third for food, one-third for drink and one-third for his breathing." <b>[At-Tirmidhi, who classified it as Hadith Hasan]</b>.

وعن أبي كريمة المقدام بن معديكرب رضي الله عنه قال‏:‏ سمعت رسول الله صلى الله عليه وسلم يقول “ما ملأ آدمي وعاء شراً من بطن، بحسب ابن آدم أكلات يقمن صلبه، فإن كان لا محالة؛ فتلث لطعامه وثلث لشرابه، وثلث لنفسه‏"‏‏.‏ ‏(‏‏(‏رواه الترمذي وقال‏:‏ حديث حسن‏)‏‏)‏‏.‏ ‏"‏أكلات‏"‏ أي‏:‏ لقم‏.‏

References1 variant
In-Book Reference
Introduction, Hadith 515
Sharh · explanationclick to expand
<b>Guidance from the Hadith:</b><br> 1) It gives a great Prophetic advice regarding the protection of health by adopting an approach of moderateness in eating and drinking. This precludes the causes of illness.<br> 2) It points out the Prophet’s guidance in eating and drinking. This is part of the excellence of this blessed Shariah, which teaches its followers how to eat.