Which is unfortunate for those who follow their high carb plant eating styles because based on what RawNut said, low poly and high saturated fat in the blood is essentially a marker for eating high carbohydrate. Concerning sunny versus less sunny areas I'm not sure there would be a difference because so many people have erroneously been told by doctors to fear the sun, douse themselves in vitamin D blocking sunscreens (sun's UVB radiation gives us the vitamin D), to stay indoors during the middle time of day, the only time of day when UVB is available. All in the name of supposedly avoiding skin cancer while ironically increasing risk of more potentially lethal internal cancers due to the resulting vitamin D deficiency. Plus I read someplace that the vitamin D recommendations may be off by something like ten-fold due to a supposed mathematical calculation error. If so that would make current recommendations about ten times lower than people might actually need. As one of the findings of this study, vitamin D deficiency: not good.