In the ancient Chinese Nei Jing: Su Wen, it has been mentioned that “poisons attack evil, five grains are for nourishment, five fruits are for help, five animals are for benefit, five dishes are for enrichment, and the odors are combined and taken to replenish the essence.” The idea of balanced diet is proposed. Modern medicine has proved that abnormal sugar regulation, hypertension, dyslipidemia and obesity in MS are all related to unhealthy factors sufficiently and poor diet, so a reasonable diet is the basis for controlling MS. According to the newly revised 2011 Dietary Guidelines for Chinese Residents by the Chinese Nutrition Society, children and adolescents should maintain a variety of foods in their diet, pay attention to the balance of meat and vegetables, and ensure the intake of fish, meat, milk, beans and vegetables. Three meals a day, with an interval of 4~5 hours between meals; the ratio of the three meals should be appropriate, according to the proportion of energy provided to the total energy of the whole day, 30%, 40% and 30% respectively; the proportion of protein, fat and carbohydrate for energy supply are 12%~14%, 25%~30% and 55%~65% respectively. In the control of total energy intake at the same time, to ensure the adequate supply of protein, vitamins, minerals. Specifically for each nutrient, there are different requirements. On the basis of limiting fat in the functional ratio of less than 30%, increase the content of monovalent, polyvalent and ω3 polyunsweet fatty acids. Protein intake should reduce the intake of “red meat”, pig, beef and sheep protein often mixed with a large amount of fat and cholesterol; while the corresponding poultry, fish, beans, nuts rich in ω3 fatty acids, should increase intake. The actual “high glycemic index” foods, such as refined rice, refined flour, potatoes, etc.; and “low glycemic index” foods such as coarse grains, whole grains, etc. contain long-chain sugar structure, slow decomposition after use, slow rise in blood sugar, should eat more. Excessive supplementation of dairy products can lead to increased incidence of prostate cancer in men and ovarian cancer in women. For adolescents, excessive dairy products can lead to reduced iron absorption and overload on the kidneys, and can even cause urinary tract stones, so it is more appropriate to control below 500ml per day. For obese children, full-fat milk should be avoided as much as possible. The intake of fiber should be increased, and the increase of fiber intake has a positive effect on both slowing down the rise of blood sugar after meals and lowering blood pressure. Sodium intake should be reduced, and the average sodium content of the Chinese diet far exceeds the WHO recommendation of no more than 6 grams of salt per person per day. In addition to a reasonable dietary institution, good eating habits should be maintained. Bad eating habits include skipping breakfast, fast, chewing less eating, eating in a non-hungry state, eating while watching TV and eating before going to bed, etc.