Hydrogenated Fats are most often found in fried foods, peanut butter, packaged foods, fast foods, and microwave popcorn. Of all the fats that we consume, hydrogenated oils are said to cause the most negative effects to your health. While most people have heard about the dangers of trans fats, some don’t realize that even if a product claims to be “trans-fat free,” if it contains hydrogenated oil it still has a few trans fats. One of the worst traps that a runner can fall into is consuming a lot of protein bars. Make sure to check the label since many of these on the market contain hydrogenated oils.