Photo: KrystynaTaran/istockphoto

5 of 6
Frosting and Microwavable Breakfast Sandwiches

What's in them: Trans fats

The science: Women consuming the most trans fats had CRP levels 73 percent higher than women eating the least trans fats, according to a study in the Journal of Nutrition. (The high-intake group was eating 3.7 grams per day, while the lowest consumed 1.5 grams per day, on average. For someone eating 2,000 calories daily, the American Heart Association recommends capping trans fat at 2 grams per day, roughly the amount you'd get from 3 tablespoons of canned frosting.) Another study in the American Journal of Clinical Nutrition found that the more trans fats women ate, the higher their markers of systemic inflammation.

One more thing: By the end of 2018, you won't need to worry about trans fats in your foods anymore, thanks to a ban by the Food and Drug Administration. Until then, check ingredient lists for partially hydrogenated oil, and if you're buying packaged or processed foods, look for those that say "no trans fats" on the packaging, rather than zero grams listed in the nutrition label (companies can list zero grams if a product contains less than .5 grams per serving).