Drink more milk every day. Milk is rich in protein, but low in fat. Of course, skim milk is the best, just like protein, but it has less fat than other milk.
Eat some coarse grains, oats, millet, beans and so on. Coarse grains are rich in dietary fiber and vitamin B, which will make you feel full and won't eat too much. It can also help some couples, because my friend lost weight with this, and it is difficult to see that she gave birth to a baby.