What physical changes happen as I get older that cause my body to respond differently to exercise and diet?

Missing the days when you could eat everything and not worry about gaining a pound or feeling sluggish? So do most adults once they hit a wall where their metabolism starts to slow down from what it was when they were teens.

Metabolism is the process of how the body converts food into energy, and it determines the rate at which your body burns calories and how quickly you can gain or lose weight, according to the American Association of Retired Persons (AARP).

The first noticeable slowing of your metabolism usually happens around age 25, though it can happen sooner for some people. As we continue to age, our metabolism continues to slow down, and it is up to each individual to take steps to help it pick back up, according to the AARP.

You can help boost your metabolism by getting at least moderate exercise for 30 minutes or more at least four times a week, according to the AARP.

What you eat also affects your metabolism. Steer clear of processed food and things that are high in fat. Instead focus on eating whole grains, fresh fruits and vegetables and lean meats, according to the U.S. Department of Agriculture.

Talk to your physician for diet and exercise habits that would be beneficial for you to help boost your metabolism.

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