It is not that simple. Your body is not able to use energy dircetly from heat. Overheating can actually be a problem and your body might have to use energy to get rid of excess heat. So you might actually lose energy by drinking hot drinks rather then gain energy. On the other hand in cold climates the body needs to use energy just to stay warm. And in this case drinking hot drinks may help the body conserve energy since it will get hot from the drink instead of having to use its own muscles just to generate heat.
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