Health in Islam: A saying from our Holy Prophet of Islam (Peace be upon him) on eating, sleeping and talking

The Holy Prophet (saw) said:

"There are three traits which Allah loves (in people): briefness in speech, short (legnth) of sleep and small (portion) of food; which there are three traits which He dislikes (in them) Loquaciousness, oversleeping, and over eating."

Ithna ashariyyah p. 92

Imam Ali (as) has said:

"Over indulgence of food causes various kinds of diseases."

Qurar-ul-Hikam, P. 359