Adopted children and food obsession?

I myself have food issue...not sure if it is because I am adopted. I grew up in a great home with plenty of food, but my parents never gave me sugar foods etc, so when I moved out that is what I went too. All the stuff I couldn't eat growing up! What I do for kids is we eat things high in fiber and protien. I find that fills everyone up, and the weight stays of those that need it, like my adopted DS! But keeps the rest of us in line:) We have oatmeal, yogurt in the morning etc. My friend has a adopted daughter who eats and eats, so she will allow seconds but only of veggies...no meat or potatoes or bread. So you could think about that, if she has finished seconds of veggies, she will allow seconds of meat,veggies and potatoes. We also switched plates around, we use smaller plates for meals, so we end up eating smaller amounts, but the eye thinks it is eating a big amount:) Hope this helps!