Tropical people work all year in the sunlight. Without the dark skin, you get terrible sun burn and skin cancer. When I worked in Africa, we had to remove skin cancers from our albino patients.
But in northern climates, the problem is that a dark skin prevents the sun from letting your body develop vitamin D, so you are more prone to ricketts.
Women with ricketts develop deformed pelvises, and they die in childbirth...
Within a few generations, darker skinned people die out... And vitamin D can be found in some foods, especially salmon and fish...hence the absense of ricketts in Eskimos.
“Within a few generations, darker skinned people die out...”
Modern man has been living in northern Europe more than 5,000 years.
