Runaway sexual selection effects generally don't result in beneficial traits; reduced melanin is beneficial in less sunny climates, because cholecalciferol (so-

Runaway sexual selection effects generally don't result in beneficial traits; reduced melanin is beneficial in less sunny climates, because cholecalciferol (so-called “Vitamin D₃”, even though it's not a vitamin) synthesis requires sun exposure. And yes, having less of something is correctly called “losing” it in the English language. That was not a correction.