Men who have low levels of vitamin D may increase the risk of frequent headaches, a new study from Finland suggests. - From Live Science
Nearly 70 percent of the men in the study had blood vitamin D levels below 20 nanograms per milliliter (50 nanomoles per liter), which is generally considered the threshold for vitamin D deficiency.
Low vitamin D levels are a particular concern in Finland and other Nordic countries, because these countries are farther north and have less exposure to sunlight, which the body needs to make vitamin D, the researchers said.
(In the United States, vitamin D levels are usually reported in ng/ml, while in other parts of the world, they are reported in nmol/L.) Men with the lowest vitamin D levels (below 11.6 ng/ml or 28.9 nmol/L) were about twice as likely to have frequent headaches, compared to men with the highest vitamin D levels (above 22 ng/ml or 55 nmol/L.) The study adds to a growing body of evidence linking low vitamin D levels to an increased risk of certain diseases and conditions, including headaches.
The new study is one of the largest to look at the link between vitamin D and headaches, the researchers said.
However, the study was conducted at a single point in time, so the researchers cannot tell which came first, the low vitamin D levels or headaches, the scientists said.