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"Why does it feel so hot outside when it is 90 degrees if our body temperature is 98.6?"
This question comes up all the time, says Goldberg (most likely during the sweltering East Coast summers). The answer is found in the human body's way of regulating temperature. We're constantly producing heat as we burn calories and exert energy, says Goldberg, and the heat needs to escape. He explains that it's easier to release pent-up heat when the temperatures outside are moderate or cool. When the temps soar, the body increases blood flow to the skin to help the heat escape through sweat. The hotter it gets, the more sweat and energy the body needs to exert, and the harder it ends up working. As a result, you feel like you're burning up.