You should eat 1200-1500 calouries per day, while doing exercise. This will help you lose the weigh quickly and still keep you healthy and fit. Make sure you dont skip meals or eat any lower than 1000 calories because this will cause your motabalism to slow down, in the long run causing you to gain weight.
Even if your tring to eat lose weight you should still eat the 2000 calories suggested, just eat them in healthy foods and moderation , take breaks for snacks in between classes, when you get home after school have a snack. 6 small meals is healthier than 3 larger meals.
The key is to consume less than you put out. The minimum intake you should have is 1200 calories. No adult woman should ever be consuming less than this, if you do - your body will start to feed on your muscles and store all the calories you consume as fat. That's far from what you want to be doing.
Make sure it's healthy foods, and spread over approximately 3 meals and 3 snacks in a day - this will boost your metabolism.
If you squeeze in a half hour on an elliptical at the gym every day, you'll probably drop those lbs in a week or so.
Slowly Over about a month Trim your diet down to A one egg breakfast and milk then a small but healthy lunch then a dinner of soup no bread . Bread is yeast and yeast if loaded with crabs