Olive oil is a great option for lowering cholesterol for a few reasons. It is high in monounsaturated fats, which raise HDL or "good" cholesterol, and one study speculated that it could also help prevent atherosclerosis by acting directly on the arteries.
Substituting olive oil for other fats, like butter, can also decrease the number of saturated fats you consume, leading to lower LDL.

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