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Explain hydration and water needs as you would to a capable student, in 3-4 sentences.

Your body needs water to regulate temperature, transport nutrients, and support every cell function—you lose water constantly through breathing, sweating, and waste elimination, so you must replace it regularly. While the old "8 glasses a day" rule is a rough guideline, your actual needs vary based on your size, activity level, climate, and diet (foods like fruits and vegetables contribute water too). The best indicator of proper hydration is pale yellow urine; dark urine usually signals you need more fluids, while clear urine might mean you're overhydrating. Listen to your thirst, but also drink proactively during exercise or hot weather since thirst sometimes lags behind actual need.