According to the book Calories and protein Intake published by the World Health Organization, a healthy adult woman needs to consume 1800 ~ 1900 calories every day, while men need 1980 ~ 2340 calories.

Calories, abbreviated as card and cal, are transliterated from English. It is defined as the heat required to raise 1 gram of water to 1 degree Celsius at 1 atmospheric pressure. Calorie is a kind of calorie unit, which is widely used in nutrition measurement and fitness manual. The international standard unit of energy is joule.

There is no uniform standard for calorie intake, which should be calculated according to everyone's weight and activity. The heat required by human body varies from person to person, and the main factors affecting heat are labor intensity, age, climate change, body shape, weight and health status.