Cholesterol in a blood vessel, illustration. Cholesterol is a lipid, a fat-like substance. High blood levels of LDL (low-density lipoprotein) choleste

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Cholesterol in a blood vessel, illustration. Cholesterol is a lipid, a fat-like substance. High blood levels of LDL (low-density lipoprotein) cholesterol compared to HDL (high-density lipoprotein) cholesterol are thought to raise the risk of atherosclerosis, the build-up of fatty deposits on artery walls. This is a major cause of heart attacks and strokes.

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Photo credit: © ELLA MARU STUDIO/SCIENCE PHOTO LIBRARY / Alamy / Afripics
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