The fat content of Whole milk is 3.0%, that of semi-skimmed milk is about 1.5%, and that of whole skimmed milk is as low as 0.5%. There is a kind of "thick milk" abroad, and the fat content can be as high as 4.0%.
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In fact, milk contains many vitamins, among which fat-soluble vitamins A, D, E and K are all hidden in the fat of milk. If the fat in milk is removed, these vitamins will be lost, which is not good for children's growth and development.
Therefore, many countries stipulate that extra vitamins A and D must be added to skim milk. In addition, the reason why milk has a special aroma depends entirely on the volatile components in fat. If there is no fat, the fragrance will be insufficient and the milk will taste tasteless.