Research indicates that staying physically active can help prevent or delay certain diseases, including some cancers, heart disease and diabetes, and also relieve depression and improve mood. Inactivity often accompanies advancing age, but it doesn't have to. Check with your local churches or synagogues, senior centers, and shopping malls for exercise and walking programs. Like exercise, your eating habits are often not good if you live and eat alone. It's important for successful aging to eat foods rich in nutrients and avoid the empty calories in candy and sweets.