To lose 50 pounds is never an easy thing to do but people have done it before you, so its entirely within your power. I say this only to be honest with you: you have to be committed to the plan, but you can succeed if you set your mind to it. I can only suggest a way in which you can do it. If you are otherwise healthy there is no reason why you should not try to lose weight quickly.
To lose 50 pounds fast, you need a diet which will provide a fast and continuous weight loss. Fast because you want to get thin as soon as possible and because the fast weight loss will motivate you to stick with the plan, continuous because it takes time to lose 50 pounds. To do so, you need a diet which will work in the long term and not just in the short term. Thats why you need to be extra careful when choosing a diet to follow; it has to be one you can follow more than a couple of weeks. Quite frankly, almost any diet will do. Its the reduction in calories that will cause you to lose weight. Pick a low calorie plan that contains foods you can see yourself eating for a while. Diets like a cabbage soup diet or grapefruit diet is not a good idea if you do not like cabbage soup or grapefruits!
The difficult part of losing 50 lbs as fast as possible is the hunger and cravings that will result with the drop in calorie intake. For this reason, I recommend using a tool that will help eliminate hunger and cravings so that you are able to stay on your diet. Diet pills will this but I dont recommend them. I recommend a natural food product such as one of the cookie diets. I make this recommendation because cookie dieting will eliminate hunger and cravings so that you can stay on a low calorie diet. Ultimately it is hunger or cravings that make us fall off our diet. If you use a program like cookie dieting, the cookies will take care of the hunger and cravings and you have just won more than half the battle!
How does this diet work? On a cookie diet program you eat about 6 of the hunger-fighting high protein/fiber/whole grain cookies throughout the day and a sensible, low-calorie dinner. This results in a daily calorie count of around 800 to 900 calories. Of course, you could eat more calories and slow down your weight loss, but the goal here is to lose the weight as quickly as possible.
How much can you lose with this diet? It really depends on your starting weight and a lot of other factors like how strictly you stay true to the plan. If you are very overweight and you stick to the plan, you could lose 50 pounds in as little as 4 months which is very impressive. You may lose even more weight initially if you limit carbohydrates. A recent study showed that combining cookie dieting with a low-carb diet such as Atkins® resulted in greater weight loss than simply dieting alone.