Dehydration
A deficit of total body water that impairs cellular function; caused by inadequate intake, excessive loss, or both.
Mild dehydration (1–3% body weight loss) can impair cognition and physical performance. Severe dehydration causes hypovolemic shock. Older adults and children are at highest risk due to reduced thirst perception and higher surface-area-to-volume ratio.
(Placeholder study content — expanded in the content build step.)
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