Cholesterol is a fatty substance produced by the liver that brings many important health benefits, such as making hormones and building cell membranes. High cholesterol means you have too much of the “bad” cholesterol. This is known as LDL cholesterol. It clings to the inside of arteries, thereby raising the risk of a blockage that can lead to a heart attack. If you have been advised to make dietary changes, there are a number of things to consider.