Kilojoule is a unit of heat, joule (abbreviated as kJ, not to be confused with kg, which is kg) is a unit of heat and work in international units, and kilojoule refers to 1000 joules. 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 calories consumed in food and the calories consumed in exercise.

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.

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

Generally speaking, adults need at least 1500 kcal of energy every day to maintain body function, because even if you lie still, your body still needs energy to maintain body temperature, cardiopulmonary function and brain operation. Basal metabolic consumption will be different due to the differences of individual height, weight, age and gender. Human beings need energy to survive and get it from food.