Stop eating! Best way is to cut calories and increase exercise.
Buy very little food. In order to lose weight, a person must use up more calories each day than he takes in. That means he will be hungry, but should only eat a little (not enough to get full). Losing 1-2 lbs a week is a good way to judge if the plan is working. Save money by drinking tap water and buying uncut veggies, whole wheat bread, and little or no sauces. Small fast-food items are ok (whopper jr. Without mayo).