Pure milk is not necessarily skim milk. Classified from the point of view of fat content, pure milk actually contains three kinds of pure milk such as whole milk, low-fat pure milk and skimmed pure milk, which means that skimmed milk is one of them, and you need to pay attention to checking the label when you buy it. If it is labeled skim milk, then it will have less fat in it, if it is not specifically labeled, it usually contains fat. Skimmed milk is actually the fat content of pure milk to remove part of the fat content to reduce its fat content to 0.5% or less, so as to reduce the intake of fat, mainly for dyslipidemia and obesity, weight loss crowd. It can control the total calorie intake, so as to play a certain effect of calorie control. For healthy people as well as teenagers, they can choose the right milk according to their needs.