According to the recommended index of China Nutrition Society, the daily calorie requirement for adult men in China is 2250-3000 calories and for adult women is 1800-2400 calories. Calories are necessary for all living things to maintain life and growth and development, so it is necessary to ensure sufficient calorie intake to maintain the normal daily activities of the human body. However, the caloric requirements vary according to the individual’s physical condition and activity level. In order to maintain normal body function, the minimum daily calorie requirement should at least meet the body’s metabolic rate, which is 6.25×height (cm) + 10×weight (kg) – 5×age – 161 for women and 6.25×height (cm) + 10×weight (kg) – 5×age for men. After calculating the minimum number of calories you need, you also need to evaluate your calorie requirements in conjunction with your regular exercise. For example, if a 20-year-old woman is 165cm tall, weighs 55kg and exercises less, her daily calorie requirement is approximately is 1815 calories. In daily life, carbohydrates, fats and proteins can be used to provide energy after oxidation in the body to ensure that the body can carry out various vital activities, which are collectively called caloric nutrients. A stable supply of calories can be ensured in daily life through a balanced intake of cereals, meat, eggs, milk and dairy products, as well as vegetables and fruits. It is important to note that while ensuring caloric intake, it is also necessary to ensure proper exercise to maintain a stable weight.