I agree with bata.
Protein helps to keep you from getting hungry. You can get this supply of protein in something as simple as a glass of milk.
Also, milk on the form of yogurt or cheese is an important source of B complex vitamins such as riboflavin and B12, as well as minerals like zinc, magnesium and particularly calcium.
When you plan to loose weight, better include milk [Low Fat] or milk in other form in your breakfast. Hence, protein helps you to keep you from getting hungry mid-morning.