Endothelial function refers to how well the endothelium, a thin layer of cells lining blood vessels, works to maintain vascular health. This layer plays a crucial role in regulating blood flow, blood pressure, and the formation of blood clots. Healthy endothelial function helps prevent conditions like atherosclerosis, where arteries become narrowed due to plaque buildup. When the endothelium is functioning properly, it produces substances that promote relaxation and dilation of blood vessels. Conversely, impaired endothelial function can lead to cardiovascular diseases, as it may result in increased inflammation and reduced ability to regulate blood flow. Maintaining a healthy lifestyle can support optimal endothelial function.