According to the food and nutrition board (fnb) of the national academy of sciences, of kilocalories should come from fat.

The food and nutrition board (FNB) gives the dietary reference intakes for Energy, Carbohydrate, Fiber, Fat, Fatty Acids, Cholesterol, Protein, and Amino Acids.
According to the food and nutrition board (FNB) of the national academy of sciences, 20% to 35% of kilocalories should come from fat. In contrast, 45 to 65% of kilocalories should come from carbohydrates and 10 to 35% should come from protein. However, the specific percent depends on the gender, the age, and very important the physical activity.

1. protection 2. homeostasis 3. storage4.blood formation5.bone marrow 6.movement