The difference between skim milk and whole milk is the difference in fat content, and the difference in the amount of fat-soluble vitamins. It is usually recommended to drink whole milk, which is more nutritious. Skimmed milk is suitable for patients with high blood fat and obesity. The fat content of skimmed milk is different from that of whole milk, as skimmed milk has almost 0% fat, while whole milk has about 5% fat. The fat-soluble vitamin content of skim milk and whole milk is also different, whole milk contains more fat-soluble vitamins, and the fat-soluble vitamin content of skim milk is lower. It should be noted that people who are allergic to proteins should not drink skim milk and whole milk to prevent allergic symptoms such as diarrhea, breathing difficulties, skin redness and swelling.