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Body Water Percentages
- Adult men's bodies are about 60% water, while women's are closer to 50% due to higher average body fat.
- Infants have a higher water percentage (around 65%) and the elderly have less water than younger adults, often below 50%.
Water Input and Thirst
- Daily water intake is roughly 2100 ml from food and drinks, plus 200 ml produced metabolically.
- The body has a strong thirst reflex regulated by the hypothalamus, so listen to it for hydration.
Water Output
- Insensible water loss (breathing, skin) is about 700 ml daily, and is difficult to control.
- Other losses include sweat (100 ml at rest), feces (100 ml), and urine (1400 ml, but highly variable).