It is therefore, necessary to avoid acid fruits in the same meal as sweet fruits or starches. Thus tomatoes should not be eaten with starches especially potatoes or bread. Refined sugar products are also acidic, both in the mouth and in the bloodstream. The acidifying of the saliva by sucrose is one of the main causes of tooth decay. It can also cause severe damage to the digestion.
Food combining is designed to facilitate easier digestion.
Starches, fats, green vegetables and sugars may be eaten together as they require either an alkaline or neutral medium for their digestion. Similarly, proteins, green vegetables and acid fruits may be eaten together as they require an acid or neutral medium for their digestion. But starches and proteins, fats and acid fruits, should not be eaten together as a general rule, if best results are required from the ingestion of the foods eaten. This in brief is the whole basis for successful food combination. An important point to remember about meals is that the smaller the number of courses they consist of, the better it will be.