1 kJ =238.9 calories =0.239 calories. Nowadays, kilojoules are often used to measure the calories contained in food and the calories consumed in a certain exercise unit time. People generally control their weight by controlling the calorie intake of food and exercise.
The daily intake of protein for normal adults should be10% ~15% of the required calories; The intake of carbohydrates should not be less than 55% of the daily calories needed by the human body; The intake of fat should not exceed 30% of daily calories.
Heat required by human body:
The daily calorie requirement of human body is about 1500 calories, which is related to physical activity. Generally, a person with a standard weight of 60 kg needs 1500- 1600 calories a day at rest. If it is moderate activity, you need 1800-2000 calories a day.
However, due to the reserve function of the human body, when our food intake is insufficient, the human body itself will generate heat, which mainly comes from the decomposition of sugar and fat in the liver. The decomposition of liver sugar can produce up to 720 calories of glucose every day. Therefore, a person needs more than 800 calories a day, which will not affect his health.