Teenage girls need adequate calories for their bones and organs to fully develop. Cutting too many calories may result in stunted growth. There are ways to minimize excess calories and still get needed nutrition. Use the Food Guide Pyramid to plan food choices. Make most choices from the bottom of the pyramid.
Whole grains provide a feeling of fullness and offer many choices.
Use fruits and vegetables for snacks or with meals. Protein foods also provide needed nutrition. Control calories by choosing lean and watching portions. And finally for a wonderful way to stay healthy, develop strong bones, and stay lean is to exercise - try to include aerobic activity most days of the week.