In one study, researchers measured vitamin D levels in 5,559 Korean men and women, aged at least 50, with CVD symptoms including chest pain, heart attack or stroke. Compared to those with the highest levels of vitamin D, those severely deficient in vitamin D—meaning 25 nanomoles per liter of blood (nmol/L) or less—were twice as likely to have CVD. This group also had other CVD factors including larger waist size, higher blood sugar levels, total circulating fats, and lower levels of HDL, the “good” cholesterol. Compared to those who were severely deficient, those with the highest levels of vitamin D—75 nmol/L or more—were half as likely to have CVD.
According to doctors, Koreans have far less CVD than the older U.S. population.