Vitamin D deficiency in people could result in stiffer arteries, says a study. The results add to evidence that lack of vitamin D can lead to impaired vascular health, contributing to high blood pressure and cardiovascular disease, Xinhua reported quoting a study from the Georgia Tech Predictive Health Institute. Participants in the study who took high levels of vitamin D were able to improve vascular health and lower their blood pressure. Some 550 employees of the institute took part. The data was presented Sunday by Ibhar Al Mheid, a cardiovascular researcher, at the annual American College of Cardiology meeting in New Orleans.