Cardio, Cardio, Cardio. Try not to eat any carbs past 3 or 4. Limit your red meat intake to once a week. You want to eat leaner meats with less fat. Chicken breast is ideal as well as fish. Eat a ton of veggies to fill you up. Eat nuts, for snacks. There are also really good nut butters to spread on a slice of healthy whole wheat bread as a snack.
They key to your success will be about moderation though. You need to watch your caloric intake.