Get the Most Out of What You Put In

The human body is an efficient machine that requires a great deal of fuel to conduct daily activities, build or maintain body tissue and organs and regulate how our bodies work. Here's a basic look at how what we take in gets used by the body during exercise. Click on the different elements to explore how the process works in the body. For more fitness and nutrition news, click here.

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Reporting by Brenna Maloney; Graphic by Laura Stanton; Interactive Design by Wilson Andrews -- The Washington Post

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