>>4335825Yes exactly
The ANF had just given up their hunter Gatherer diet, replacing all of their food with grains. The indigenous people of Europe were the WHG, who were very very brown despite living at ligh latitudes, because they had a diverse and meat rich hunter Gatherer diet, which especially included fatty fish and meat which was their main source of vitamin d, so they could thrive despite little sun and being brown
Grains have zero vitamin D, so there was widespread vitamin d deficiency and natural selection made the ANF and later, EEF skin lighter in tone, combined with their move to higher latitude