Body temperature measures the internal temperature of the human body.

Body temperature is correlated strongly with ⟐ Metabolism, according to ⟐ Ray Peat. The idea is that a higher metabolism = more energy = more heat generated by the body.

This is in contrast to some people like Brian Johnson, who are trying to slow down their body and lower their body temperature. They believe that this will slow down their biological clock and allow them to live significantly longer.