“Researchers prospectively evaluated the lipid profiles of 227,359 individuals who had health check-ups in primary care centers in the city of Campinas, Brazil, between 2008 and 2010. In this analysis—the largest study to date to evaluate cholesterol levels by season—data reveal that low density lipoprotein (LDL) or “bad” cholesterol increased an average of 7mg/dL during the winter compared to summer. Researchers say this moderate, but significant, increase in LDL cholesterol was enough to result in an 8 percent overall increase in the prevalence of high cholesterol during the winter.”
“The shorter days of winter also mean less sun exposure and subsequently lower concentrations of vitamin D. Vitamin D has been shown to improve the ratio of bad to good cholesterol.”
The argument then is this: is it the high cholesterol or the low vitamin D which is problematic?