How can I suppress my hunger to control how much I eat?

Eat! But eat smart. If you're always hungry, you're probably not eating enough of right foods. It's not just number of calories but also composition of those calories. Carbohydrates tend to get burned up quickest, although you can choose healthier low glycemic carbs w/lots of fiber. Protein sticks around longer & delays hunger. Choose lean meats, fish, chicken, even beans. Don't forget healthy fats like fish & veggie.