Question: what is high cholesterol

Matt Bawn answered on 8 Mar 2018:

Cholesterol is a waxy substance found in human blood, the body needs it to be able to make cell membranes (what protects cells from their surroundings) enabling them to adapt and change shape rapidly. Humans normally produce cholesterol in the liver but you can also get it from food such as egg yolks or cheese .

Increased levels of cholesterol in your blood can:
“build up in the artery wall, restricting the blood flow to your heart, brain and the rest of your body. It also increases the risk of a blood clot developing somewhere in your body.” … https://www.nhs.uk/conditions/high-cholesterol/

which also states:

As a general guide, total cholesterol levels should be:

5mmol/L or less for healthy adults