7700 kilocalories is equal to one kilo of fat.

Each gram of fat will produce 9 kilocalories, and to reduce 1 kg of fat, 7700 kilocalories must be consumed.

The main sources of fat are cooking fat and the fat contained in the food itself. The fat content in nuts is the highest, and all kinds of meat are in the middle, but the content in rice, noodles, vegetables and fruits is very small.

Energy metabolism:

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 for survival and get it from food.

The calorie content in food is a measure of how much potential energy the food produces. 1 g carbohydrate contains 4,000 calories, 1 g protein contains 4,000 calories, and 1 g fat contains 9,000 calories. Generally, food consists of these three substances.

Therefore, as long as we know the contents of these three substances in food, we can know how many calories or how much energy food contains.