"Lack of exposure of bare skin to sunshine is not the only biological consequence of modern life for which we must compensate; we must also return to the nutrient-rich foods on which our ancestors thrived and of which modernity has disposed: the fats and organs of animals raised on the pasture of mineral-rich soil, foods preserved by traditional fermentation rather than modern refrigeration, and the mineral-rich gifts of the oceans in which life originated."
Well put line from this article https://www.westonaprice.org/health-topics/abcs-of-nutrition/from-seafood-to-sunshine-a-new-understanding-of-vitamin-d-safety/#gsc.tab=0