The reason for the update is that the Committee believes that there is not enough scientific evidence to establish the risk of chronic diseases in healthy people, so it is impossible to determine the upper limit, but there is still a moderate to strong causal relationship and dose-response relationship between sodium and cardiovascular diseases, hypertension, systolic blood pressure and diastolic blood pressure.
Therefore, the latest report replaces the upper limit of sodium intake with an intake that reduces the risk of chronic diseases. The new standard is that the risk of cardiovascular disease can be reduced if the daily sodium intake of healthy adults is reduced to 2,300mg (5.8g of salt, about 1 teaspoon of salt), and further reduced to1.500mg (3.75g of salt, about half teaspoon of salt).
Sodium is a chemical element with chemical symbol Na and atomic number 1 1. Simple sodium does not exist in the earth's nature, because sodium will rapidly oxidize in the air and react violently with water, so it can only exist in the form of compounds. Silver white cubic structure metal. The new section has a silvery white luster and is oxidized to dark gray in the air.
Soft and light, the density is lower than water, and it hardens at -20℃. When it meets water, it reacts violently, generating sodium hydroxide and hydrogen, generating a lot of heat, which will melt itself and lead to spontaneous combustion or explosion. In the air, it burns a yellow flame.