Girls grow faster during adolescence than at any other time in their lives save infancy. That requires a mountain of vitamins and minerals best found in food, totaling an average of 2,200 calories a day. But all too often teenage-girls don't eat a balanced diet and don't get the nutrients they need. For instance, they often don't get enough calcium, which can lead to osteoporosis, or iron, which can lead to anemia.
Refocus your teen's diet to include at least five servings of fruits and vegetables and three, eight-ounce glasses of milk a day. Keep nutritional snacks like cut up fruit, pretzels, cheese sticks, individual yogurts and butter-free popcorn, on hand. Don't bring soft drinks into the house. Set a good example by eating nutritiously yourself at home or while dining out.