Polyunsaturated fats are found primarily in common cooking oils like safflower, corn, soybean, cottonseed, sesame, and sunflower oils. These oils are also used as ingredients in foods. But be cautious. Sometimes these healthful fats are changed into saturated fats. Research has shown that substituting monounsaturated fat for saturated fat also reduces blood cholesterol levels.
Dietary cholesterol is a waxy, fat-like substance found in foods that come from animals.
Although it is not the same as saturated fat, dietary cholesterol also can raise your blood cholesterol levels. Therefore, it is important to eat fewer foods that are high in cholesterol. Your liver makes enough for your body's needs. There is no need to consume any additional cholesterol. Egg yolks, liver, kidney, brains and sweetbreads are particularly rich sources of cholesterol.