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Cholesterol is transported in the bloodstream via lipoproteins, including LDL, which is often linked to heart disease. An egg yolk contains about 200 milligrams of cholesterol, while the body synthesizes around five grams daily in the liver.
Cholesterol is essential for nerve function, red blood cell function, hormone production (estrogen, testosterone, etc.), vitamin D production, and bile salt creation. It's a critical component of cell membranes. Eliminating cholesterol entirely would be fatal.
LDL plays a role in the immune system by inactivating bacteria and neutralizing toxins. Some research indicates that individuals with higher LDL levels live longer. Atherosclerosis occurs in arteries, not veins, due to the significantly higher blood pressure in arteries.