There is a famous saying in the school: "Training that can't eliminate fatigue is dangerous." Professor Yang Zeyi, a researcher at the Nutrition Center of the Institute of Medicine of the State Sports General Administration, told the reporter that science includes scientific nutritional supplements. However, at present, there are very few sports nutritionists who give guidance to the crowd in China, and the public generally lacks the concept and knowledge of sports nutrition. Sports nutrition needs experts to guide Professor Yang to engage in sports nutrition for a long time. He said: "Some people think that' eating and drinking after exercise' is to supplement nutrition; Others think that' if you want to lose weight, you have to eat and drink'. In fact, this is not true. " Eat, drink and "don't eat or drink" don't pay attention to the balance of energy and nutrition, and train the next day. "Sports nutrition needs professional guidance. Sports nutritionists mainly provide reasonable guidance on sports and nutrition for people of different ages, different constitutions and different needs, and at the same time teach people to eat reasonably and achieve their goals. Fitness, muscle gain, slimming, shaping and recovery, different fitness groups need different sports nutrition guidance. "Sports nutrition guidance is a very important link in the scientific and technological content of mass fitness. In the United States, whether a health club is equipped with nutritionists is an important indicator to measure whether the club is perfect and professional. In this respect, we obviously have a big gap with developed countries. Professor Yang said that it is very important to supplement water, sugar and salt during exercise. But many people don't understand science when they exercise. " Professor Yang reminded: First of all, you should pay attention before, during and after exercise. It is not advisable to "drink without thirst". When people feel thirsty, the body is already in a state of mild dehydration. When the water loss of sweat reaches 2%-3% of body weight, the exercise ability will decrease. The resulting decrease in blood volume will overload the heart. Add120-240ml of water every15-20min. Secondly, fruit juice, tea, carbonated drinks and white water are not suitable for drinking during exercise. Sports drinks should be selected to replenish energy and lost electrolytes, vitamins and water in time. There are five principles of exercise: in addition to supplementing water during exercise, sugar and protein should be supplemented in time after exercise to help the muscle particle structure recover. Fitness enthusiasts should pay attention to the following issues: first, choose the types and quantities of food for three meals reasonably, not just according to their own preferences. Second, we should pay attention to the intake of staple foods, such as rice, noodles and steamed bread. The staple food is rich in carbohydrates, which can provide sufficient energy for athletes. Third, the ratio of animal protein to plant protein should be appropriate to avoid eating too much meat. Eat more milk and soy products. Fourth, eat more fruits and vegetables, especially raw ones, to reduce the loss of nutrients. Fifth, eat less or no fried food and fat pork.