Scientists noticed that heart attacks in men seemed to vary according to whether they lived in higher latitudes, or were enduring the winter months - and they attributed this to the availability of sunshine - and the sunshine vitamin, vitamin D3.

The authors of the study write: "This pattern is consistent with an adverse effect of hypovitaminosis D [vitamin D deficiency], which is more prevalent at higher latitudes, during the winter and at lower altitudes"

Even when other risk factors were taken into account, the researchers determined that  men with high levels of vitamin D had approximately half the risk of heart attack as men whose levels were inadequate.

I'd take odds that the same is true for women.  Perhaps they won't be so sexist next time!!

Men With Vitamin D Deficiency May Have Increased Risk Of Heart Attack