Why Would You Want a Hot Drink on a Hot Day?

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It’s hot out there. How about a nice cold drink?
You hear the clink of ice cubes in a tall glass, see the beads of sweat condensing on the outside, and you just know you’re in for some serious refreshment.

So why does the rest of the world drink hot tea in hot weather?
Can a couple of billion subcontinental residents be wrong?

It’s counterintuitive, but there is basic brain science behind it. A hot drink tells the nerve receptors in your mouth that things are getting hot in there and it turns on a cooling response—basically it makes you sweat. It works with spicy foods too—the receptors in your tongue read ‘hot’ peppers in the same way as they read hot tea, so either way it triggers a message to the brain telling it to cool things off.

The increased rate of perspiration is key.
If you’re not much of a sweater, the heating power of the drink can exceed the cooling power of the sweat you produce. It adds heat to your body without the compensating power of perspiration and you end up just feeling flushed and even hotter. And if you are a big sweater, the moisture has to be able to evaporate from your skin, since the cooling effect comes from the transfer of body heat into the atmosphere via the perspiration. If you’re wearing too much clothing it can hold the sweat in, or if the day is muggy, the humid air won’t pull the moisture off of you.

Hot or iced- which should you choose?
Do you sweat some, but not too much? Do you like to expose a lot of skin in warm weather? Do you live in a dry, desert-like climate? Personally, I still would like a nice iced coffee, but feel free to give a hot one a try. If you are reasonably modest and live within about a two thousand mile radius of Washington D.C. you probably want to stick with iced.

 

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