Do not try to lose weight too rapidly. Crash diets and diet pills that promise weight loss are usually bad for you and actually don't help keep the weight off in the long run. Resist the urge to take the "easy" way out and instead stick with a healthier lifestyle. This way you lose the weight and improve your health, helping you keep the weight off in a way that won't harm you in the long run.
Here's something else most people probably don't know: Fidgeting is good for you. It's considered a nonexercise physical activity, and it's an important way to burn energy. You get more health benefits if, in addition to exercising, you are a more fidgety, more active person the rest of the day. This means gesturing while you're talking, tapping your foot, just moving around.