Can I lose weight through diet alone? Or do I need to exercise, too?Daily physical activity can help you control your weight and can reduce your risk of chronic disease. That’s why it is the foundation of the Harvard School of Public Health’s Healthy Eating Pyramid. Aim for at least 30 minutes a day of physical activity; many people will find that 60 minutes a day is helpful for weight control. For more information on the benefits of physical activity, read the article about