Why is physical activity important for a healthy weight?

As we age, a decrease in our physical abilities leads to a decrease in our metabolic rate (amount of energy used in a given period), which in turn contributes to weight gain. Regular physical activity is important for good health, and it's especially important if you're trying to lose weight or to maintain a healthy weight.

•When losing weight, more physical activity increases the number of calories your body uses for energy or "burns off." The burning of calories through physical activity, combined with reducing the number of calories you eat, creates a "calorie deficit" that results in weight loss.
•Most weight loss occurs because of decreased caloric intake. However, evidence shows the only way to maintain weight loss is to be engaged in regular physical activity.
•Most importantly, physical activity reduces risks of cardiovascular disease and diabetes beyond that produced by weight reduction alone.