Final answer:
The 2015-2010 Dietary Guidelines for Americans recommend limiting trans fats, found in processed foods like certain margarines and baked goods, due to their association with increased risk of heart disease.
Step-by-step explanation:
Based on the 2015-2010 Dietary Guidelines for Americans, foods that should be limited due to the content of trans fatty acids include processed foods such as commercial baked goods, some desserts, certain types of margarine, frozen pizza, microwave popcorn, and coffee creamers. Trans fats are considered unhealthy because they can increase the risk for high cholesterol, heart disease, and stroke. Foods that list partially hydrogenated oils in their ingredients often contain trans fats.
Margarine, some peanut butter varieties, and shortening are examples of products that contain artificially hydrogenated trans fats. These trans fats have been shown to elevate levels of low-density lipoproteins (LDL), commonly known as "bad" cholesterol, which may lead to plaque buildup in the arteries and subsequently heart disease. It's essential to check food labels for trans fat content to minimize intake.