Card is short for calorie. Kcal = 1000 calories (calories)

Card is the abbreviation of Calorie, transliterated from English Calorie (abbreviated as cal). It is defined as the heat required to raise 1 g of water to 1℃ at1atmospheric 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.

Extended data:

Heat not only provides energy for people's exercise, daily work and life, but also provides energy for human life activities, blood circulation, breathing, digestion and absorption. People who lose weight can burn fat through exercise, which can accelerate calorie consumption and achieve the goal of healthy weight loss.

Calories come from carbohydrates, fats and protein.

Heat generated by carbohydrates = 4 kcal/g.

Heat generated in protein = 4 kcal/g.

Heat produced by fat = 9 kcal/g.

References:

Baidu encyclopedia-calories