The ancients said: the disease enters from the mouth. According to the inference of modern medicine, the life span of human beings is far from the present age, but twice as long as it is now. How can we achieve natural life? Experts suggest that you use a casserole: Casserole does not contain any harmful elements to human body, frying and stewing does not have any qualitative change to food, plus a reasonable diet and scientific food preparation, it can naturally stay away from diseases and prolong life.