Good nutrition is important, no matter what your age. It gives you energy and can help you control your weight. It may also help prevent some diseases, such as osteoporosis, high blood pressure, heart disease, type 2 diabetes, and certain cancers.But as you age, your body and life change, and so does what you need to stay healthy. For example, you may need fewer calories, but you still need to get enough nutrients.Requirements vary from person to person .