注意看下面这段英文

• Oxidized cholesterol, formed when polyunsaturated vegetable oils (such as soybean, corn, and sunflower oils) are heated. A primary source is fried foods. This oxidized cholesterol (not dietary cholesterol in and of itself) causes increased thromboxane formation—a factor that clots your blood. Two of Dr. Kummerow's papers also pertain to how these oils harden your arteries and play an important role in the development of atheorosclerosis. As noted by the New York Times,10 these oils are precisely the types of fats that Americans have been, and still are, urged to consume in lieu of saturated fats like butter.