Eating sugar reasonably is good for health. Sugar is a safe and cheap energy source. Qian, a professor at Beijing University of Chinese Medicine, said: "Among the three alternative sources of life energy: sugar, fat and protein. No matter under aerobic or anoxic conditions, sugar can be burned in different ways to provide energy for human beings. Moreover, after sugar burns in the body to release energy, the final products are carbon dioxide and water, and carbon dioxide can be easily discharged through the respiratory function of the lungs, which has almost no harm to the human body. In contrast, protein will produce harmful substances such as ammonia in the process of decomposition, while fat will produce ketone bodies in the process of decomposition and metabolism, which is unfavorable to organisms. In addition, sugar is also an essential substance for human body. After being digested and absorbed by the human body, sugar is easily converted into glucose in the blood, that is, blood sugar. Under normal circumstances, blood sugar can pass through the barrier smoothly and become the energy source of brain tissue. Because brain tissue has almost no special dependence and sensitivity. Once the blood sugar is insufficient, it is easy to get confused. Nervous, unresponsive, tired, and even unconscious. On the contrary. Eating sugar can stimulate brain activity and improve function, which has been confirmed by researchers of MIT students in the United States. There must be enough sugar in the blood to fully supply the energy needed by cells. Studies show that when the sugar in food is exhausted, people are prone to burnout. When the blood sugar drops to 70 mg, people gradually feel hungry. Fatigue gradually forms fatigue. When blood sugar continues to drop, fatigue will become failure, and symptoms such as dizziness, weakness and instability will appear. Even abnormal heart rhythm, foot weakness or vomiting may occur. Sugar is not necessarily related to disease, and sugar is not the chief culprit of disease. Chen Junshi, a professor at the Institute of Nutrition and Food Hygiene, Chinese Academy of Preventive Medicine, pointed out: According to epidemiological research results, sugar intake is not directly related to obesity, but fat intake is closely related to obesity, and diabetes has nothing to do with how much sugar is eaten, because diabetes is caused by impaired islet function. Eating sugar is not directly related to the increase of blood lipid. It should be said that the main dietary factor affecting blood lipid changes is saturated fatty acids. Only when the intake of sucrose or fructose is high will the blood lipid increase, which is due to the unique metabolic pathway of fructose in the liver. Therefore, sugar will not cause an increase in blood lipids under normal intake. Sugar is not the cause of dental caries. As we all know, Britain has always maintained a high per capita sugar consumption, but the incidence of dental caries is low. In contrast, in China, where the consumption of candy in grocery stores is low, the incidence of dental caries is high. Professor Chen said: "People think that eating sugar often will lead to dental caries, because sugar exists in dental cavities for a long time and can become a bacterial culture medium that causes teeth. If you gargle or remove sugar in time after eating sugar, it will not cause dental caries. "China people should eat sugar properly. Jia Zhiren, president of China Sugar Association, said that the average annual sugar consumption of China people is only 8 kilograms, and the average daily consumption is only 2 1.9 grams. The average annual sugar consumption of Americans is as high as 70 kilograms, and the average daily consumption is 192 grams, which is far from the same. Another survey data shows that China's per capita sugar consumption ranks seventh from the bottom in the world, which is a very low level. Because of this, when the Nutrition Society of China revised the Dietary Guidelines for China Residents in April, 1997 deleted the article "Eat less sweets". There is no emphasis on controlling sugar intake. In fact, the human body needs a lot of nutrients, and excessive intake of any kind of food or essential nutrients will cause nutritional imbalance. Eating a lot of sugar for a long time is beyond the needs of the human body and the processing capacity of the liver, and it will also cause certain harm to the body. So learn to eat sugar scientifically and reasonably. The recommended intake of sucrose by nutritionists is 30-40 grams per day. The elderly control their intake due to physical adjustment. For people who are not suitable for eating sugar, such as diabetes, obesity, impaired glucose tolerance, hypercholesterolemia, coronary heart disease, etc., we must eat sugar in moderation under the guidance of nutritionists.