heat adaptation

Heat adaptation refers to the physiological and genetic adjustments humans make to survive in hot environments. The primary challenge in hot climates is dissipating body heat, rather than conserving it. This is typically achieved through sweating. However, in humid heat, the evaporation of sweat is hindered, increasing the risk of overheating.

Individuals adapted to humid heat are often tall and thin, maximizing surface area for heat radiation. They tend to have less body fat and wider nasal passages, as warming inhaled air is not beneficial. Dark skin is also common, offering protection from solar radiation and potentially lowering the sweating threshold. In dry heat, such as desert conditions, adaptation focuses on efficient sweating and managing water loss, leading to individuals who are typically thin but not necessarily tall.12