My lunch is 2 peanut butter sandwiches w/ choc milk. i want a flat stomach. how do i modify this lunch or should i eat a completely diff lunch?

Change diet: First, if u want to lose weight to get a flat stomach - change your diet - that is not healthy or low fat at all. You have the carbohydrates from white bread plus the chocolate & milk. Milk is not healthy at all & chocolate milk is even worse. Peanut butter is good only if it is natural peanut butter with nothing added like corn syrup - check the label. Better is fruits, veggies, whole grains.