Dehydration occurs when fluid loss exceeds intake. Even mild dehydration (1-2% body weight) reduces concentration, increases fatigue, and causes headaches.
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Pro Tip
Start each day with a large glass of water - overnight you lose fluid through breathing and can be mildly dehydrated on waking.
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Did You Know?
The 8 glasses a day myth has no scientific basis. Individual needs vary hugely by body size, climate, and activity level.
References
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