The energy generated by 1g carbohydrate oxidation in vivo is 17. 15KJ.

The energy generated by 1g fat oxidation in vivo is 39.54KJ.

The energy generated by the oxidation of 1g protein in vivo is18.2kj.

The absorption rate of carbohydrates, fats and protein is 98%, 95% and 92% respectively. Therefore, the actual energy values generated by the oxidation of three productive nutrients in the body are as follows:

1g carbohydrate:17.15kj * 98% =16.81kj (4.0kcal).

1g fat: 39.54kj * 95% = 37.56kj (9.0kcal).

1g protein:18.2kj * 92% =16.74kj (4.0kcal).

Energy provided by protein = protein intake * 1 g energy provided by protein (i.e. 4.0 kcal).

Fat energy supply = fat intake * 1g fat energy supply (i.e. 9.0kcal).

Total energy = carbohydrate energy+protein energy+fat energy.

So 70*4 is kilocalories in protein, and 58.3*9 is kilocalories in fat.

Carbohydrate energy supply accounts for about 60% of total energy supply, which is an estimate. If the topic is to let you match meals, you can convert the amount of some staple foods you need according to 60% carbohydrate energy supply.

Energy supply varies according to food intake. When calculating the exact function number, it should be calculated according to the energy supply of protein and fat, and cannot be directly multiplied by 60%, unless the title clearly tells it that carbohydrate energy supply accounts for 60%.

In fact, the red line is the same. The topic is about the demand of protein and the percentage of fat energy supply, so it can be calculated directly. If you don't understand, look at the following equation:

Protein energy supply ratio = protein intake *4/ total energy intake * 100%.

Carbohydrate energy supply ratio = carbohydrate intake *4/ total energy intake * 100%.

Fat energy supply ratio = fat intake *9/ total energy intake * 100%

Knowing the fat energy supply ratio, multiplying the fat energy supply ratio by the total energy intake is not fat intake *9?

The same reason as above.

When you understand the above questions, you will naturally understand them.