Applicable people are different: skim milk is suitable for adults, or people who have requirements for fat intake lose weight. Whole milk is generally suitable for growing children or people engaged in heavy physical activities.
The fat content is different: whole milk contains about 3.25% fat, while skim milk contains less than 0.5% fat. Because whole milk contains a lot of fat, the total calorie is high, and the calorie per 100 ml is about 60 calories. However, the calorie of skim milk is low, about 34 calories per 100 ml.
Different nutritional components: Although whole milk and skim milk are rich in protein, vitamins and minerals, the fat in whole milk contains more nutritional components such as vitamin A, vitamin D, vitamin K, phosphorus, calcium and lactose than skim milk.