"The son of Adam never fills a vessel worse than his stomach, The son of
Adam only needs a few bites that would sustain him; but if he insists, one
third should be reserved for his food, another third for his drink and the last
third for his breathing."
Ailment attack and harm our bodies and alter its normal functions due to excess amount od substances we consume... traceable to overeating or consuming more than what the body needs. When we habitually fill our stomachs with all types of food, some of which may not easily be digestable, we end up with various types of illness. On the other-hand, when one eats moderately, the body will get maximum benefit from such moderate diet, as opposed to when one overeats. So, keep to this Noble Hadith when it comes to food and drink.