Hydration After 50: Why Men Need More Water Than They Think and How to Get It By Chris McCarthySeptember 29, 2026October 7, 2026 Categories: Hydration, Nutrition & Meals Tags: nutrition Thirst is the mechanism the body uses to signal the need for water. In younger adults, it works reliably: the hypothalamus detects rising plasma osmolality as body water decreases, triggers the thirst sensation, the man drinks, and the balance is restored before meaningful dehydration develops. It is one of the more elegant self-regulating systems in...