The other part of the energy balance equation is physical activity. The Dietary Guidelines are complemented by the
2008 Physical Activity Guidelines for Americans issued by the Department of Health and Human Services (HHS) in an
effort to provide evidence-based guidelines for appropriate physical activity levels. The 2008 Physical Activity Guidelines provide guidance to Americans aged six and older about how to improve health and reduce chronic disease risk through physical activity. Increased physical activity has been found in scientific studies to lower the risk of heart disease, stroke,high blood pressure, Type 2 diabetes, colon, breast, and lung cancer, falls and fractures, depression, and early death.

Increased physical activity not only reduces disease risk, but also improves overall health by increasing cardiovascular and muscular fitness, increasing bone density and strength, improving cognitive function, and assisting in weight loss and
weight maintenance.

• Even small amounts of activity are beneficial to your health.

• More substantial health benefits are obtained by doing at least two hours and thirty minutes per week of moderate-intensity, or one hour and fifteen minutes per week of vigorous-intensity aerobic physical activity, or an equivalent
combination thereof. Aerobic activity has better benefits if performed for at least ten minutes at a time, spread
throughout the week.

• More extensive health benefits occur when moderate-intensity physical activity is increased to five hours per week,or to two hours and thirty minutes of vigorous-intensity aerobic physical activity, or a combination thereof.
Additional health benefits are gained by going beyond these recommended amounts of physical activity.

• Muscle-strengthening activities at moderate or high intensity involving all major muscle groups two or more days
per week provides additional health benefits to aerobic exercise.

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