Why a cooler body might age more slowly
Core temperature is the temperature deep inside the body, where organs function—not the reading at the skin or the temperature of a hand. A naturally lower core temperature has been associated with longer life in humans and other animals, prompting a question: could running slightly cooler reduce some of the wear that accumulates over time?
One proposed link is metabolism. Cells use chemical reactions to turn food into usable energy. Those reactions can also generate free radicals—reactive molecules that may damage cell components if they build up faster than the body can manage them. A cooler metabolic pace might produce fewer of these molecules, potentially reducing one source of cellular damage.
An association, not a temperature prescription
The idea is plausible, but it does not show that lowering a person’s temperature will extend their life. Temperature and metabolism are influenced by many factors, and an observed link cannot by itself establish which causes which—or rule out other explanations. Core temperature also changes with time of day, activity, illness, and other conditions, so an isolated reading is not a measure of someone’s aging rate.
The useful implication is narrower: body temperature may be one clue to how energy use and aging are connected. It is not a reason to try to become colder. The proposed benefit concerns a naturally occurring pattern, not deliberate cooling, which can be harmful and is not established as a longevity strategy.
