 person should not eat or drink anything except what is in accordance with the nature and balance of his body so that its temperament will be balanced. if something of his nature is wrong with him he should stick to food and drink and its opposite until he breaks what is wrong with his nature.
فينبغي للإنسان ألا يصيب من الأطعمة والأشربة إلا ما منها طبائع جسده وعدلها حتى يكون مزاجها معتدلا، وأنه إن بغى عليه شيء من طبائعه أن يلزم من الطعام والشراب وبضده حتى يكسر به ما بغى عليه من طبائعه.