Calories come from carbohydrates, fats and protein.

Heat energy generated by carbohydrates = 4 kcal/g

Heat generated in protein = 4 kcal/g.

Heat generated by fat = 9 kcal/g

1, staple foods: such as rice, porridge and noodles. If 80 calories are used as a unit of calculation, the calories of a bowl of rice 1/4 bowls, half bowls of porridge or half bowls of noodles of ordinary size commonly used in daily life are equivalent to 80 calories.

2, meat, tofu, eggs: 37 grams of lean meat and 20 grams of fat are 80 calories. 125 grams of milk, two teaspoons or half a tablespoon of oil are all 80 calories. It is worth noting that 1 boiled egg has 80 calories, but 1 fried egg has 120 calories.

3. Vegetables: 600 grams of any vegetable is equal to 80 calories.

4, seafood: 100 grams is about 80 calories.

5, fruits: 300 grams of watermelon, two oranges are 80 calories.

Extended data:

Daily calorie requirement

1, the daily calories needed by adults = the basic calories needed for basic metabolism of human body+the calories needed for physical activity+the calories needed for digesting food.

2. The heat required for digesting food = 10% x (the minimum heat required for basic metabolism of human body+the heat required for physical activity)

3. The daily calorie required by adults = 1. 1 x (the minimum basic calorie required by basic metabolism of human body+the calorie required by physical activity).

Male: 9250-10090kJ.

Female: 7980-8820 kilojoules?

Baidu encyclopedia-food heat meter

People's Network-How many calories do adults need in a day?