Calorie (abbreviated as Cal) is a physical energy unit, defined as the heat required to raise 1 gram of water at 1 atmospheric pressure (1 kloc-0/.325 kPa); But the "calories" used to describe the calories contained in food are often kilocalories, which is cal. One thousand calories equals 1000 calories.

Generally speaking, there are two kinds of calories:

Calories, also known as capital letter C, are most commonly used in food labels, which is equivalent to the heat required to raise 1 000 grams of water from 14.5℃ to 15.5℃ at1atmospheric pressure, which is about equal to the internal energy of 4 186 joules.

Xiaoka, also called cal, is equivalent to the heat required to raise 1 g water from 14.5℃ to 15.5℃ at1atmospheric pressure, which is quite common in scientific research literature. Small card = 1 big card (1 KI

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 China, calories are still widely used in Chinese mainland and Taiwan Province provinces due to tradition.

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1、? Joule has been widely used as the unit of heat in modern science, and "15℃ heat" is generally used in nutrition.

2、? Joules are widely used in Europe, while calories are used as the legal unit of food calories in the United States. Although Joule is also the legal unit in China, calories are still widely used because of the tradition in China.

3、? As the unit of measurement for calculating human daily calorie intake, calories are too small, so nutrition labels generally use kilocalories, commonly known as calories (symbol? Kcal, sometimes writing? Cal) as the unit; 1 calorie is equal to 1000 calories, that is, 4 186 joules. (One gram of protein and sugar can produce 4 calories, and one gram of lipid can produce 9 calories. )

4、? Nutritional advice on basal metabolic rate? (BMR), the average adult absorbs 1800 to 2400 calories a day, which is equivalent to 7500 to 10000 kilojoules. Too much or too little is unhealthy.