I say that healing is done in three things. One of them is the regimen and nutrition, the second is the use of drugs and the third is the use of an action with the hand. By regime we mean the regulation of a limited number of necessary factors that usually exist; this includes food. The prescriptions of the regimen correspond to the prescriptions of the drugs in terms of their quality. However, for nutrition, among these prescriptions there are special ones related to quantity, because food is sometimes forbidden, sometimes reduced, sometimes made in moderation, and sometimes increased in quantity.