A diet alone will result in failure, and you will either gain more weight or at least pop back up to your old weight as result. One selection is to have less slices of pepperoni on your pizza, or you might substitute it for a more healthy spicy meat such as chorizo or also Canadian bacon which are both complete of flavor.
All it takes is selecting healthy foods in common sense amounts and just getting some activity in a few days weight loss a week. If you need to know how to lose weight, then eventually you discover the most basic principle of weight loss: what you put in your mouth has a profound effect on how much weight you lose. It is much healthier to change your eating patterns to lose weight than to take any type of pill. This ensures that you act now and not put it off till later.