First, in fact, after degreasing or semi-degreasing, the fat content is 0.5% and 1% ~ 2% respectively, while the whole fat is only 3%.
That is to say, 100g has only 3g fat, and our body also needs to consume a certain amount of fat every day. However, this 3g fat only accounts for a small part of our body's needs, so it has no effect at all.
Second, although the fat content of skim milk is below 0.5g per100g, it tastes like milk mixed with water! At this time, some idiots will eat melon white. In order not to taste so bad, they added some messy things! Like sugar! A spoonful of sugar is much more than that 2.5g of fat!
Third, whole milk is more likely to feel full, so you won't be hungry easily, and then you will eat less, so you will consume less calories, which is more helpful for you to lose weight.