“The son of Adam does not fill any vessel worse than his stomach.
It is sufficient for the son of Adam to eat a few mouthfuls, to keep him
going. If he must do that (fill his stomach), then let him fill one third
with food, one third with drink and one third with air.” Prophet
Muhammed PBUH. Narrated by: al-Tirmidhi (1381), Ibn Maajah (3349).