ייִדישער מחשבֿה אויף ירמיהו 31:30

If his illness was due to habitually eating food harmful to him (ex. too much spicy food), the way of his healing would be to abstain from this food or others similar, and to habitually eat foods of an opposite nature and composition (ex. non spicy), until he returns to his original state. When his health is restored and he reaches a balanced state, he can eat foods midway both types of nature and composition (mildly spicy), and the verse already compares moral iniquities to bad food as written: "But every one shall die for his own iniquity. He who eats the sour grapes, his teeth shall be set on edge" (Yirmiya 31:29).