Fat

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The word "fat" can also mean that someone is obese.

Fat is something found in foods, and it is the most concentrated kind of energy that a human can use. It has 9 kilocalories in one gram. The other two types of energy that humans can use are carbohydrates and proteins. Those each have 4 kilocalories in one gram. The two types of fats are saturated and unsaturated.

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