400 kilocalories a day is the average. Generally speaking, the daily calorie consumption of adults is about 2200-2400 kilocalories for men. Female: 1900-2 100 kcal or so.

1 kg coal with heat of 1000 calories is equivalent to 0. 143 kg standard coal. For example, 7000 kcal coal means that the calorific value of coal is 7000 kcal/kg, which is equivalent to engineering. 1 calorie = 1000 calories, which are mostly used in nutrition measurement and fitness manuals.

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Generally speaking, adults need at least 1500 calories a day to maintain body function, because even if they lie still, the body still needs energy to maintain body temperature, cardiopulmonary function and brain operation. Basal metabolic consumption varies with individual height, weight, age and gender.

Human survival needs energy, which is obtained from food. The calorie content in food is a measure of how much potential energy food produces. 1g carbohydrate contains 4 calories, 1g protein contains 4 calories, and 1g fat contains 9 calories.

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