Fruits, grains, legumes as well as vegetables are particularly rich in antioxidants and accompanying substances know as phytochemical elements, that act as true natural pharmaceuticals. Fruits and vegetables also provide an excellent source of vitamins, minerals and fiber. and are low in calories. Foods can prevent and cure diseases, but they can also cause them. Therefore, the best diet is not one that includes ‘ a little of everything” but one that avoids the harmful and makes moderate use of the beneficial ones.
Source: -Foods that Heal, Natural Remedies Encyclopedia