Cholesterol

Cholesterol is any of a class of certain organic molecules called lipids. It is a sterol, a type of lipid. Cholesterol is biosynthesized by all animal cells and is an essential structural component of animal cell membranes. When chemically isolated, it is a yellowish crystalline solid.

Many different factors can contribute to high blood cholesterol, including lifestyle factors like smoking, an unhealthy diet and lack of exercise, as well as having an underlying condition, such as high blood pressure or diabetes.