Calorie (Cal for short), transliterated from English Calorie, is defined as the heat required to raise 1 gram of water to 1 degree Celsius at 1 atmospheric pressure; Calorie is an energy unit, which is still widely used in nutrition measurement and fitness manual. The international standard unit of energy is joule. As the legal unit of food calories, joules are widely used in Europe, while calories are used in the United States. Although Joule is the legal unit in Chinese mainland and Taiwan Province Province, it is still widely used in Chinese mainland and Taiwan Province Province because of tradition.

Extended data

There are three kinds of calories in food.

There are three kinds of calories in food: protein's calories are the basic nutrients to strengthen muscles, mainly from meat, dairy products and eggs, with 4 calories per gram; Carbohydrate calories are the main energy source of human body under normal circumstances, which are contained in rice, flour, noodles, bread, cereals, vegetables and fruits, and each gram of calories is also 4 calories; Fat contains 9 calories per gram, which is found in both oil and cream.

There is also a kind of heat called "deficiency heat", which refers to those foods that only provide energy but have low nutritional value, such as cold drinks, alcohol and fast food.

The ideal calorie ratio of each meal is probably: carbohydrate 65%, fat 20%, protein 15%.

Irving Wooler is an American biochemist and nutrition expert who has written more than 20 professional books. He said that the best calorie ratio varies from person to person, and the general principle is that carbohydrates should not be too much or too little, and fat and protein should not be completely shut out.

Reference materials? Calories-Baidu Encyclopedia