I would recommend reading this article on the Second Opinions website.
The article begins -
We have all heard the claims that a high blood cholesterol level is harmful: it increases the risk of a heart attack. We hear and see this message in news bulletins, magazine articles, advertisements for cholesterol-lowering foods — even breakfast cereals — and drugs several times every day. But is the evidence so clear?
Cholesterol is an essential chemical in our bodies with a wide range of uses and application. Just as our body temperature is held within very fine limits for the whole of our lives, so are hundreds of other processes and chemicals. We don't need to measure and 'correct' even one of them; our bodies can and do regulate these automatically within fine limits and with great accuracy. Unlike body temperature, cholesterol rises naturally as we age and the idea that everyone, young or old, male or female, should all have exactly the same amount of cholesterol in their blood is, frankly, ridiculous.
So, isn't it conceivable that if cholesterol isn't available in sufficient quantity, that deficiency could have catastrophic effects? Or that changing our levels of cholesterol artificially might be detrimental to our health?
Please click on the above link to read the full text.