The study was reported Wednesday at an American Heart Association conference in New Orleans and was also published online by the Annals of Internal Medicine.

Many of the studies did not specify causes of death, but researchers believe patients died of all the usual causes, including heart disease and cancer.

According to the study, people taking daily doses of 400 international units or higher are 10 percent more likely to die than those taking 200 units or less.

Studies also show that healthy people who eat vitamin-rich food seem to have less heart disease.

(Agencies)