Meng Changhai, Department of Endocrinology, The First Affiliated Hospital of Henan College of Traditional Chinese Medicine Among many adolescent women who have weight loss as their goal, they are willing to pursue a painless and enjoyable way to lose weight, and dieting is the most respected. Dieting is a way to lose weight by controlling dietary portions and reducing energy intake, and is considered to be an effective way to lose weight in parallel with exercise. In life, we can often see a variety of ways to lose weight: one is to control the frequency of diet. For example, some people eat one less meal a day or only one meal, skip breakfast, or skip dinner; the second is to replace the diet with fruits and vegetables with sugar and water compounds to eliminate fat. Many beauty lovers replace every meal with apples and cucumbers; the third is starvation therapy. Some people are so eager to lose weight that they starve themselves, go on a hunger strike one day a week, do not eat or eat less, and some people even invoke the Taoist method of forbidden grain to lose weight; the fourth may be the cruelty therapy. Cruelty to what extent, such as some people eat, and then probe the throat to spit out. There is also a situation in dieting to lose weight, which is to prefer to eat nutrients instead of diet. Are so many ways of dieting for weight loss reliable or not? Can they achieve the desired weight loss effect? It must be seen realistically, and we often see some around us who achieve results through these ways, but soon the fat comes back on; there are also some who have no weight loss results from the beginning to the end. Why this happens, I personally believe that it is related to the choice of dieting and weight loss methods. We know that the occurrence of obesity has a lot of reasons, both congenital genetic factors, but also the acquired environment, there are primary obesity, but also secondary obesity, clinically to simple nutritional obesity is most common. This type of obesity occurs and energy absorption metabolism is closely related, because the body to the energy metabolism imbalance, resulting in the absorption of energy than the consumption of, thus leading to excess energy in the form of fat accumulation and obesity. From this pathogenesis, there should be two important aspects of weight loss: one is to control energy intake, and the other is to promote energy consumption. The two complement each other, and one cannot be separated from the other. The focus of diet therapy is to control energy intake. People want to lose weight by controlling their mouths and eating less, which is a very important way and method. But what are the criteria for controlling energy? This piece needs to have a grading according to the energy level, in general we can be divided into zero energy diet, very low energy diet, low energy diet, normal energy diet, high energy diet according to the level of dietary energy, different people can take different approaches. This different energy diet pattern is exactly the basis for taking a diet to lose weight. To carry out a scientific dieting method, it is necessary to choose the correct level of different standard diets. Zero energy diet is also known as starvation therapy, fasting therapy, where the patient is prohibited from ingesting food, and this approach is similar to the Taoist practice of puerperalism. The general choice of zero energy therapy is for patients with severe obesity without comorbidities, who are willing to cooperate and are eager to achieve results. The course of treatment usually lasts 10-14 days and requires that the body’s energy intake is almost zero during the treatment period, without eating any food containing energy. This kind of weight loss therapy reduces energy intake and also cuts off the source of other nutrients needed by the body, which will bring other serious sequelae to the body while reducing weight, and is risky and should not be used blindly. For obese patients, the corresponding training can be carried out if the situation permits, but need to be under the guidance of specialized personnel. The very low energy diet is more humane than the zero energy diet, where the patient can eat, but the energy is strictly limited and the meals are fixed. It is suitable for patients with simple severe obesity and is relatively humane compared to short-term fasting, avoiding the unbearable hunger and the resulting adverse effects. The food must contain high biological value (high quality) protein. The aim is to make the patient lose weight rapidly, to protect the other tissue components of the body as little as possible by virtue of the high quality protein supplied in the food, and to minimize the damage to the body caused by the negative nitrogen balance associated with weight loss. However, this method has a high recurrence rate. According to the data, after one course of treatment (3 months) with ultra-low energy diet, obese people can lose an average of 15-20 kg, but after 1-2 years of stopping treatment, 55% of patients return to their former weight. Low energy diet is generally relative to the normal diet level of the surrounding population, and is also a common way of dieting and weight loss in our daily life. It is mainly used for patients who are not too much over the standard weight and who have basically reached their ideal weight through ultra-low energy diet therapy to maintain their weight. This method generally focuses on vegetables, soy products and melons and eggplants, moderate amounts of eggs, small amounts of grain, and fish can be alternated with eggs. Low-energy diet therapy is a simple method, easy to operate, easy for patients to accept, is a theoretically more in line with the human physiological needs of weight loss method. However, it will cause obesity to rebound seriously because the patient cannot really reduce the energy in the diet, or when the energy in the diet is reduced at the same time, the physical activity is relatively reduced. The normal diet is mainly based on coarse grains and a large proportion of vegetables and fruits, which is the same as the dietary pattern of our traditional diet with many sugar and water compounds, low fat and low protein. It should be especially noted here that the normal level diet is relative, for some nutritional obesity patients, can be adjusted from the excess nutritional state to the normal human diet, in many cases is already difficult. Therefore, for some fat people, especially those who are over-nourished and have a strong appetite, we can consider returning their diet to the normal state first. This kind of people because of the long-term high nutrition adaptation is difficult to produce compliance, through a gradual return to the regular diet, and then adjusted to a low-energy diet after a period of adaptation, combined with exercise to achieve the desired results. In fact, each of these approaches has its strengths and weaknesses. Short-term fasting therapy provides almost zero energy, and although the weight loss effect is reliable, the damage to the body should not be taken lightly; ultra-low energy diet therapy must ensure the supply of various nutrients required by the body under the condition of limited energy supply, so it often needs to rely on special dietary formulas to achieve this purpose; low-energy diet therapy is similar to dietary control therapy for diabetic patients, which is simple and easy to implement and has less impact on patients’ health. Low-energy diet therapy is similar to dietary control therapy for diabetic patients, which is simple and easy to implement and has less impact on patients’ health, but the short-term weight loss effect is not as good as the above two methods. Based on the energy doctrine, we can easily grasp the existence of some dieting and weight loss phenomena, those patients with strong appetite simply rely on eating a few carrots, a few tomatoes is not necessarily reliable; patients with some complications to take some extreme and cruel diet diet, such as starvation therapy is dangerous; those who only expect to rely on a low-energy diet without taking the combination of exercise to lose weight For those patients who are on a low-energy diet without exercise, although they keep their mouths shut, they cannot consume enough energy to lose weight without exercise, and for those who vomit after eating into the stomach, the food will be vomited out together with stomach acid, which will easily lead to digestive dysfunction. Therefore, the selection of dieting methods for weight loss must adhere to several principles: one is to be scientific, this scientific is based on the accurate grasp of the patient’s physique, but at the same time to be able to know the metabolism of energy. Second, it should be long-term. Dieting and weight loss is a process, a process of returning to normal eating patterns from abnormal, therefore, years of habit change cannot be rushed, but must be gradual. Third, it is necessary to have perseverance. The primary difficulty in dieting to lose weight is the intolerable feeling of hunger. Many people because they can not resist hunger, after the strict eating requirements, but also secretly add food in private, drinking high-energy drinks. Therefore, if you want to lose weight, you have to withstand the temptation of food. Fourth, it is necessary to combine exercise and other ways and means. Dieting to lose weight is not adapted to lazy people, those who rely solely on the mouth to move the legs of the way to lose weight is not to achieve good results.