Tip: Current Food and Drug Administration guidelines allow manufacturers to say that their product is "trans fat free" if it contains less than 0.5 grams of trans fat per serving. Check the labels of processed food for "hydrogenated" or "partially hydrogenated" oils in the ingredients. These words signal that product may have up to 0.5 grams per serving. Eat a few servings, and this starts to add up.
The bottom line? Be an educated shopper: Know what to look for and the potential pitfalls. Try to do the majority of your shopping on the perimeter of the grocery store, limiting your trips down the inside aisles — where most of the trans fat culprits reside. On the perimeter, you can focus on fresh and frozen fruits and vegetables, lean cuts of meat and fish, and whole grains fresh from the bakery. Add a little olive oil, and you'll really be cooking!