What is the practical way to calculate one-third for food, drink, and self, and how can the stomach be practically divided into three parts as mentioned in the hadith: "Sufficient for the son of Adam are a few mouthfuls to straighten his back; but if there is no escape, then one-third for his food, one-third for his drink, and one-third for his self"? And how can this hadith be reconciled with the hadith of Abu Hurairah, in which the Prophet, peace and blessings be upon him, asked him to drink until he was full?

The hadith (definition): "Enough for the son of Adam are a few morsels to keep his back straight. But if he must, then one third for his food, one third for his drink, and one third for his breath" is a hasan (definition) sahih (definition) (good and authentic) hadith. The matter of this division depends on each individual according to their needs, so one should not exceed the amount of sufficiency lest harm befall them. The levels of food intake are three: necessity, sufficiency, and excess.

Filling the stomach with food is harmful to the heart and body if it is continuous or frequent. However, occasional satiety is permissible. There are examples of the Companions experiencing satiety. The intention behind "one third" is not precise exactitude but approximation, and it does not contradict the permissibility of non-harmful satiety that does not burden the stomach.