If you want to gain weight, you need to create a calorie supply, meaning you eat more calories than your body needs. For example, Milk can help you get more calories because it’s full of proteins, carbs as well as calcium, and whey proteins.
Studies have proved that after a workout, drinking milk helps to build muscle more effectively than a soy-protein beverage. So, If you don’t workout, drink about one or 2 glasses of milk with your meal.