Although a Inch concentration of cholesterol in the blood increases the body's ability to fight off infections it typically also increases the risk of dying from a stroke or heart attack, two of the most common causes of death However, in a recently completed ten-year study of people eighty-five and older, higher cholesterol levels tended to be associated with greater longevity.
Which of the following, if true, most helps to explain the contrast between the highlighted effect of high cholesterol levels and the result of the study?
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