Lunch boxes are divided into three sizes, because simple meals can be divided into muscle-increasing meals, fat-reducing meals and nutritious meals. The box of fat-reducing meals is set at 800 ~ 850 ml. Generally speaking, for people who want to lose weight, the food should be low-carbon, low-calorie and low-calorie, and the staple food, such as salad, should not be used. The lunch box for muscle-strengthening meal is set at 1000- 1200ml. Muscle-building meals are generally eaten by healthy and muscular men. The lunch box for nutritious meals is set at about 1000ml. As for ordinary people who want to eat light food to recuperate their bodies, they just need to satisfy themselves that they can eat normally and have enough nutrients needed by the human body.

The principle of fitness diet is:

1, choose a high-low carbon diet

When people lose weight, they plan to eat a low-carbon diet for a long time, which will bring other harm to their health. Therefore, when the exercise intensity is the greatest, they should arrange the most carbohydrates for nutritional supplement, and it is better to eat a low-carbon diet when the exercise intensity is not great.

2. Choose foods with high fiber and low fat.

Foods with high cellulose can make people feel full quickly, and at the same time, they can avoid eating more foods with high fat and high calorie, and eat less foods with particularly high fat such as fat meat, braised pork and hamburgers, so as to avoid fat accumulation in the stomach.

3. Foods rich in water

In the process of exercise and fitness, the human body will lose a lot of water, especially in hot weather or in a closed space for high-intensity exercise, and the water in the body will lose a lot. So you need to replenish water, you can drink some functional drinks or water, and you can also eat some fruits and vegetables with enough water.

4. Food rich in protein

Muscles are made up of protein. For people who exercise, they need to take enough protein to keep fit. Therefore, every time you exercise, you should pay attention to the right amount of protein.