Dr. Matt and Dr. Mike's Medical Podcast Fluid Balance and Hydration (re-release)
Oct 18, 2025
Dive into the fascinating world of fluid balance and hydration! Discover why understanding body water is crucial for kidney health and fitness. Learn how water content varies by age and sex and explore the essential sources of hydration. The hosts break down daily water needs, routes of loss, and the science behind osmosis and tonicity. Enjoy insightful case studies on sweating, diarrhea, and the impacts of electrolytes. Plus, tips on recognizing dehydration symptoms that can help keep you healthy and hydrated!
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Body Water Varies By Age And Sex
- Adult males are about 60% water while females are about 50% due to higher average fat content.
- Infants have ~65% water and elderly under 60% because muscle loss reduces body water.
Daily Water Input Totals About 2.3 L
- Average daily water input is
2.3 liters including metabolic water (200 mL). - Most intake comes from drinks, with food contributing the rest.
Typical Daily Water Losses Add Up To Intake
- Insensible losses (breathing, skin) are ~700 mL/day and renal loss averages ~1.4 L/day.
- Total average daily output equals input at ~2.3 L, keeping fluid balance.