Eating a well balanced diet, containing a variety of cereals, grains, protein, dairy products and carbohydrates. Many young girls do not consume enough to grow and maintain healthy bones. The recommended amount is 1000mg of calcium per day. It is important to remember fat does not equal calcium. Many low fat dairy products are high in calcium.
Osteoporosis is largely preventable for most people.
Educate yourself and as soon as possible begin preventative actions. Eat a well balanced diet and have regular meals. Aim to be in a healthy weight range- don't diet excessively. Exercise regularly, but don't over do it. If you smoke, consider stopping.