Generally speaking, drinking milk in moderation will not make people fat, because milk is rich in nutrients such as protein and calcium, and its fat content is relatively low. Moreover, studies have shown that drinking milk in moderation also helps to lose weight.

However, if you drink too much milk or choose to add sugar and other high-calorie milk, it may lead to weight gain. Therefore, when choosing and drinking milk, you need to pay attention to the following points:

1. Choose low-fat or skim milk: Low-fat or skim milk has lower fat content, which can reduce the intake of fat and calories.

2. Control the consumption: drink milk in moderation, and the recommended daily consumption is 200-300ml. Excessive drinking may lead to excessive intake of protein, increasing the burden on the kidneys, and lactose in milk may be decomposed into glucose and galactose, increasing the risk of blood sugar fluctuation.

3. Choose unsweetened milk: If you like to drink milk with sugar, you should control your sugar intake and avoid taking in extra calories.

4. Pay attention to the time of drinking milk: It is best to drink milk at breakfast or dinner, and you can cooperate with some fiber-rich foods, such as whole wheat bread and oats, to help control your weight.

In short, drinking milk in moderation will not make people fat, but will help them lose weight. However, we should pay attention to the selection of appropriate types and drinking amount to avoid over-reliance or selection of high-calorie milk drinks.