PTH and diabetes mellitus: Study findings have inversely associated risk factors for CVD with serum 25(OH)D levels, including lower serum high-density lipoprotein cholesterol (HDL-C) levels, higher serum triglyceride (TG) levels [15], diabetes mellitus (DM) [8,19], increased blood pressure (BP) [15,20,21,22,23,24,25], dysfunctional changes in the characteristics of plasma lipids [26,27,28], inflammation [29] and increased serum parathyroid hormone (PTH) levels [30].