Final answer:
Margarine is not a leading source of cholesterol as it is made from vegetable oils and does not contain cholesterol. However, consumption of trans fats found in margarine can increase "bad" cholesterol levels which are associated with heart disease.
Step-by-step explanation:
False. Margarine is not a leading source of cholesterol in the American diet. Margarine, some types of peanut butter, and shortening are examples of artificially hydrogenated trans fats. While trans fats may increase low-density lipoproteins (LDL), or "bad" cholesterol, margarine itself does not contain cholesterol as it is made from vegetable oils. Foods high in trans fats have been linked to an increase in heart disease risks due to plaque buildup in the arteries. However, many fast food restaurants and food manufacturers have either eliminated or significantly reduced the use of trans fats due to these health concerns, and food labels now display trans fat content to help consumers make informed choices.