I imagine I would do better with more fish and seaweed. However, a recent talk at TED, http://www.ted.com/talks/nina_jablonski_breaks_the_illusion_..., implies that we are getting enough sun even at higher latitudes. Humans at higher latitudes seem to have quickly evolved to lighter skin colors to allow more Vitamin D production. Drastic movements between latitudes may cause more harm than good.