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SCCholesterol is an essential lipid molecule required for normal cellular function. It is a key component of cell membranes, helping maintain their fluidity and structural integrity, and also acts as a precursor for steroid hormones, bile acids, and vitamin D. However, when cholesterol levels especially low density lipoprotein (LDL) become elevated, it can accumulate in the walls of arteries, forming plaques that lead to atherosclerosis. This condition narrows blood vessels, restricts blood flow, and increases the risk of cardiovascular diseases such as heart attack and stroke. Thus, the concept illustrates a fundamental biological principle: many substances are beneficial in moderate amounts but become harmful when present in excess.
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