Final answer:
The common sources of trans fatty acids include margarine, fried foods, and commercially baked goods, which can increase 'bad' cholesterol and risk of heart disease.
Step-by-step explanation:
The common food sources of trans fatty acids are typically found in processed and prepared foods. Among the options provided, margarine, fried foods, and commercially baked goods are the usual suspects when it comes to high trans fat content. This type of fat is considered the most unhealthy and is linked to an increased risk of high cholesterol, heart disease, and stroke. Margarine, certain types of peanut butter, and shortening represent artificially hydrogenated trans fats, which can increase levels of low-density lipoproteins (LDL), also known as "bad" cholesterol.
It's important to read food labels carefully to identify trans fats; labels are required to display trans fat content. These are often seen in the list of ingredients as "partially hydrogenated oils." Given the health risks, many fast food restaurants have reduced or eliminated trans fats from their products, and it's advisable for individuals to minimize their intake of such fats.