Part of the reference to "National Food Safety Standards"? General Rules for Nutrition Labeling in prepackaged foods (GB 28050—20 1 1).
"3.4 The nutritional components of food should be marked with specific values, which can be obtained through raw material calculation or product testing."
2. Error is allowed in the nutrient composition table.
3. It can be inferred from the above table that the first column is the nutritional components that the standard-setters think are beneficial. Sodium is in the second column, so it can be considered that excessive consumption is not recommended. It's normal, and many doctors will also advise not to eat too salty.
Legally speaking, there is no heat hidden outside the label of "energy".
5. It is more convenient to compare NRV with similar products.