Research published in Physiology & Behavior shows that morning hydration can rapidly influence brain function by counteracting the mild dehydration that commonly occurs overnight.
Studies in this journal report that water intake improves attention, reaction time, and subjective alertness, particularly when consumed soon after waking. The mechanism is physiological rather than stimulatory, as hydration supports cerebral blood flow and neural metabolism without relying on caffeine. In contrast, coffee’s cognitive effects depend on caffeine absorption, which takes longer to peak. These findings suggest that drinking water upon waking can activate brain function more quickly than coffee, as it addresses the body’s immediate physiological needs.
Binod Kumar Simkhada
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