Drinking milk and soaking oats in moderation at dinner will generally not gain weight. Oat is also a whole grain, rich in cellulose and low in calories. Milk is also a kind of food with low calorie and rich nutritional value. If you drink oat milk correctly and properly, you don't have to worry about gaining weight. Moreover, milk oatmeal can increase satiety, but it is not suitable for eating too much at night, otherwise it is easy to get fat.
At the same time, pay attention to the ingredient list when buying enough oatmeal. People who lose weight should eat pure oatmeal. There is nothing on the ingredient list except oatmeal. Of course, you can't just lose weight through diet. Proper exercise can achieve better weight loss. There is also the best choice for drinking oat milk to lose weight is pure milk, and the calorie of sweetened milk is higher than that of pure milk, which is not conducive to weight loss.
In short, you don't have to worry about getting fat if you drink some milk oatmeal at night, but everyone's physique is different, and whether you get fat or not varies from person to person. You can decide whether to eat milk oatmeal at night according to the actual situation.