>>12413453Apart of the white adaptation is to synthesis vitamin D. People with agriculture had very limited diets so they would not receive vitamin d through their diet of just potatoes or whatever, so they became more fair to get it from the sun. Inuits and Alaskan natives already get vitamin D from their diverse diets of tasty fish guts and so forth, that way they aren't vitamin D deficient that would warrant the adaptation for light skin.
