Exercise makes you sweat. Heat makes you sweat. So does sweating even just from heat have any health benefits?
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Yes. Sweat is liquid. Liquid evaporates. Evaporation requires energy (specifically, thermal energy). While the liquid does take a lot of energy from the surrounding environment, it also takes a lot of that energy from your body. That means your body loses thermal energy, cools down. Cooling down can, and usually is a good thing.
Your body produces a lot of heat, one of the most important ways for your body to control the internal temperature is sweating. Without sweating, fevers are much more likely. You could end up getting a fever even without being sick. The reason above 104⁰ F is such a dangerous fever is because you get to temps where proteins start to denature (unravel). That’s bad. Like, really bad. So sweating cools the body and stops your cells from literally disassembling themselves.
Additionally, any toxins that are water-soluble can be dissolved in sweat as it leaves your body. As they will get left behind when your sweat evaporates, there’s always the possibility that some will re-enter your body, but some won’t.
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