Popular diet pills work fast to help you lose weight, lose fat and lose pounds. These popular pills and drugs alter one of the fundamental processes of the human body, weight regulation, either by supressing your appetite, by increasing body metabolism, or blocking digestion of food. The pills work by using pharmacological agents that help you lose weight, pounds and fat. For most people, diet restriction and exercise are still the best way to lose weight safely. But starting and maintaining a weight-loss program is not easy, so people look for popular diet pills and drugs to start losing weight, fat and pounds. You should avoid any popular diet pills that work with drugs or other ingredients withdrawn from the market because of health and safety concerns. Here are the popular diet pills and how they work to lose weight, fat and pounds.