Diabetes is a condition that results in high blood glucose levels from the lack or ineffective use of the hormone called insulin. The body uses insulin to absorb glucose from the bloodstream into other cells to provide energy. A person with diabetes doesn't use insulin effectively, doesn't make enough insulin, or doesn't make insulin at all.
Elevated blood glucose levels may increase the buildup of plaque inside the coronary arteries, causing coronary artery disease, or CAD. In addition, high blood glucose can cause inflammation inside blood vessels, which can aggravate problems related to CAD.