---
id:"kb-2026-00419"
title:"Hydration and Health"
schema_type:"TechArticle"
category:"health"
language:"en"
confidence:"high"
last_verified:"2026-05-22"
generation_method:"ai_assisted"
ai_models:["claude-opus"]
derived_from_human_seed:true
primary_sources:
  - title:"Dietary Reference Intakes for Water (IOM, 2004)"
    type:"standard"
    year:2004
    url:"https://www.nap.edu/catalog/10925/dietary-reference-intakes-for-water-potassium-sodium-chloride-and-sulfate"
    institution:"National Academies Press"
secondary_sources:
  - title: "MDN Web Docs — HTTP"
    type: "documentation"
    year: 2026
    url: "https://developer.mozilla.org/en-US/docs/Web/HTTP"
    institution: "Mozilla"
completeness: 0.88
ai_citations:
  last_citation_check:"2026-05-22"
---

## 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)