Fat-like substances in the blood are called lipids and are an important component of living cells. Cholesterol is one type of lipid, and there are two types of cholesterol. LDL, which is often called the “bad” variety, transports cholesterol from the liver to the blood vessels. Too much cholesterol can clog them. HDL or “good” cholesterol helps the cholesterol travel from the blood vessels to the liver for disposal. Triglycerides are lipids that enter the bloodstream through the food we eat; they store energy until the body needs it.

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