No one likes when her face is too damp to apply makeup on summer mornings or when it seems like every white shirt you own is permanently discolored, but sweat is actually the body's (pretty brilliant) built-in cooling system. Your body temperature rises, your nervous system gives your sweat glands the green light, and moisture pops onto your skin, where it evaporates, cooling you down in the process.
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And yet, we're constantly at battle with our sweat: trying to make it stink less, trying to stop it altogether during an important meeting, then trying to lose buckets of it at the gym. But if you stop and pay attention, all that perspiration can actually teach you a surprising amount about yourself and your health. Here are a few things it's trying to tell you.