(FOXNEWS) — Even a slight change in our water levels can lead to dehydration. And if we constantly fail to top-up on H2O whenever we lose it (and we lose it a lot), then we may become chronically dehydrated. Thankfully, your body will let you know when this happens.

Water plays a key role in body temperature regulation. When we begin to overheat, we sweat. By sweating, we lower our body temperature through evaporative cooling. Because sweat is mostly made up of water, when we’re dehydrated, we’ll stop sweating and can quickly overheat. Anyone who’s ever suffered heatstroke understands the importance of hydration on a hot summer’s day!

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