In northern latitudes people have less melanin to promote the manufacture of vitamin:

Question

Quizplus · Accepted Answer

Melanin is a pigment that protects the skin from UV radiation, but it also reduces the production of vitamin D in the skin. In northern latitudes, where there is less sun exposure, people with lighter skin have evolved to produce less melanin in order to maximize vitamin D synthesis. Therefore, people with less melanin in northern latitudes are at a higher risk of vitamin D deficiency, which can lead to several health problems.

In Northern Latitudes People Have Less Melanin to Promote the Manufacture