Calorie (Cal for short), transliterated from English calorie, is defined as the heat required to raise 1 gram of water 1 degree Celsius at 1 atmospheric pressure; Calorie is an energy unit, which is still widely used in nutrition measurement and fitness manuals. The international standard energy unit 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 China, calories are still widely used in Chinese mainland and Taiwan Province due to its tradition.

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The role of calories

All the calories our body needs come from food. When eating, the chemical action of human metabolism breaks down food and converts it into energy. Daily activities, from breathing to running a marathon, are driven by burning calories.

Burning heat is one of the metabolic processes. If the body needs enough oxygen, water and food, cells will work actively and burn calories at the best speed. Therefore, a healthy diet, good digestion, proper minerals and vitamins, and regular exercise are indispensable.

If there is insufficient nutrition, the efficiency of metabolism will decrease, making cells work slowly, and the speed of burning calories will be greatly reduced. The "unused" calories will accumulate to form fat and increase weight.

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