The higher the score, the more content there is on the nutrition label, which is marked by the percentage of nutrient content in the nutrition reference value (NRV), and the pruning interval is specified as 1. The calculation formula is: x/nrv× 100% = y%, where: X= the content of a nutrient in food NRV= nutrient reference values y% nutrient = calculation result.
The nutrition reference value of food labels is a reference standard for comparing the contents of food nutrients on food nutrition labels, and it is also a reference standard for consumers to choose food. Nutrient reference values is based on recommended intake (RNI) and appropriate intake (AI) of dietary nutrients for residents in China. International organizations and countries basically have their own national NRV, and the formulation of NRV in China is also in line with the world.
It can be used to compare and describe the content of energy or nutrients, such as the percentage of nutrient reference values (NRV%). Specify the interval of contract modification as 1, such as 1%, 5%, 16%, etc. When nutrition claims and zero values are used, they are used as standard reference values. X= the content of a nutrient in food; NRV= recommended daily intake of this nutrient; Y%= nutritional reference value.
Recommended intake refers to the nutrient intake that can meet the vast majority (97%-98%) needs of a certain gender, age and physiological state; Appropriate intake refers to the intake of certain nutrients in healthy people obtained through observation or experiment.
The main purpose of RNI is to serve as the target value of daily intake of this nutrient by individuals. RNI is ear-based. If the standard deviation of the ear is known, RNI is defined as the ear plus two standard deviations, that is, RNI = ear +2SD. If the information about demand change is insufficient to calculate SD, it is generally assumed that the coefficient of variation of the EAR is 10%, then RNI= 1.2×EAR.
RNI plays a limited role in evaluating individual nutritional intake. If the individual's intake is lower than RNI, it can be considered that there is a risk of insufficient intake; If the average intake of individuals reaches or exceeds RNI, it can be considered that there is no danger of insufficient intake.
Dietary intake or any other single index can not be used as the basis for the average individual nutritional status. Intake is often lower than RNI, which may mean that further biochemical tests or clinical examinations are needed to evaluate their nutritional status.