Metabolism is your engine it's the rate at which your body converts food into power. Some people talk of having a "fast metabolism" when they eat a lot and don't gain pounds, while for them they have a "slow" one and pounds just pile on in no time. But metabolism's not just a question of pounds it's connected to your power, hormones, and even your body's responses to food and physical activity. Put your knowledge to the test on this hidden engine in you!
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