High levels of it can increase the risk of heart disease and strokes - two of Britain's biggest killers. Dr Lizzie Kershaw-Yates, GP and medical team member at TheOnlineClinic, puts us straight about exactly what cholesterol is

It’s actually essential
We all need it – it’s a biological substance our bodies create (although some naturally create more than others). However, our Western diet is high in fat and sugar, which often leads to raised cholesterol levels.
A high level of cholesterol doesn’t necessarily mean you need treatment. It will depend on other things, including your family’s medical history and risk factors for cardiovascular disease.
What is the correct level of cholesterol?
The total cholesterol level (TCL) should be less than five mmol/l. Your doctor will also be interested in the ratio of HLD to TCL, which should also be five or less.

