Refers to the minimum intake to maintain normal physiological function and good health.

2. Supply (RDA):

On the basis of physiological needs, considering the safety factor of the population, determine the appropriate dietary intake.

Reasons for safety factor:

Individual differences, stress needs, nutrient loss in food processing, differences in digestion and absorption rate, food production and supply.

RDA= thermal energy = physiological demand

Nutrient RDA= physiological requirement +2SD