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Cholesterol is a waxy, fat-like substance.
It is a very important part of our lives - it insulates nerves and helps to produce certain hormones. But cholesterol is also something that we need to keep a careful eye on. It can become a problem if you have too much of it in your body. Cholesterol travels through the blood stream in special carriers called lipoproteins because it cannot dissolve in the blood by itself. When we have too much LDL-cholesterol in our blood, it builds up in the walls of our arteries, eventually clogging them up.