Chronic dehydration is widespread and impairs both physical and cognitive function, while acute overhydration is rare but dangerous. Drinking water first thing in the morning can improve alertness, support metabolic and cardiovascular health and aid kidney function. Optimal daily water intake is individual, but general guidelines suggest 2.0–2.7 liters for adult women and 2.5–3.7 liters for men. Consistent hydration throughout the day is more critical for health than the specific timing of water consumption. Simple indicators like urine color can help individuals monitor and adjust their hydration status effectively. For decades, public health messaging has centered on the simple directive to drink eight glasses…

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