Trying to lose weight is a goal that shouldn't depend on pills. For some very overweight people, or for people with diseases that are complicated by their weight - medication maybe a helpful addition. Changing eating and physical activity habits helps with weight and improves your health.
Aerobic activity helps the heart and blood vessels pump better.
In addition, muscle mass develops making your body more lean - a good indicator of fitness. Use the pyramid to pick lower fat foods - a good way to control calories. Foods on the bottom of the pyramid also provide valuable fiber, vitamins, minerals and phytochemicals which may help with disease prevention. So toss the pills and magic bullets and get moving with healthful eating and activity.