# Hydration and Health
Confidence: high
Last verified: 2026-05-22
Generation: ai_assisted


## TL;DR

Water is essential for every bodily function: temperature regulation, nutrient transport, waste removal, joint lubrication. Daily intake: men ~3.7L, women ~2.7L (from all sources, not just drinking). Dehydration impairs cognition, mood, and physical performance at just 1-2% body water loss.

## Core Explanation

Urine color: pale straw = hydrated; dark yellow/amber = dehydrated. Thirst is a late signal — by the time you're thirsty, you're already 1-2% dehydrated. Water-rich foods (cucumbers, watermelon) count. Hyponatremia: drinking too much water dilutes blood sodium — rare but dangerous (endurance athletes). Tap vs. bottled: no health difference in most developed countries.

## Further Reading

- [Dietary Reference Intakes for Water (IOM, 2004)](https://www.nap.edu/catalog/10925/dietary-reference-intakes-for-water-potassium-sodium-chloride-and-sulfate)