Your Brain Is Starving, and It's Not for Food

Jul 20th 2026 11:34pm EDT

STORY AT-A-GLANCE Your brain is about 75% water, and even mild dehydration slows focus, memory, reaction time, and mental clarity long before intense thirst appears Researchers found that 56% of older adults in a two-year cognitive study were physiologically dehydrated, even though most consumed what guidelines considered enough water Dehydration interferes with blood flow, oxygen […]

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