There are sound physiological reasons for eating foods in compatible combinations. The principles of food combining are dictated by digestive chemistry. Different foods are digested differently. Starchy foods require an alkaline digestive medium which is supplied initially in the mouth by the enzyme ptyalin.
Protein foods require an acid medium for digestion- hydrochloric acid.
The undigested food mass can cause various kinds of digestive disorders. Undigested food becomes soil for bacteria which ferment and decompose it. Its by products are poisonous, one of which, alcohol, is a narcotic that destroys or inhibits nerve function. Acids neutralize the alkaline medium required for starch digestion and the result is fermentation and indigestion. Eat protein foods and carbohydrate foods at separate meals.