The Real Meaning of 'Zero Trans Fats'
In any grocery, you'll see many products boasting "zero trans fats." Yet this does not necessarily mean there is absolutely no trans fat in the product.
"Even though the label states "zero trans fats," one serving of the food can contain up to 0.5 grams of trans fat, according to the law, and still be labeled trans-fat-free," explains Elizabeth Ward, MS, RD.
The same guideline exists for saturated fats. Only when the food label states "no trans fats" does it really mean there are none.
The problem is that small amounts of these artery-clogging fats can add up quickly, especially if you eat several servings each day of foods that contain up to 0.5 grams per serving.
For example, popcorn can be an excellent source of fiber, is a whole grain, and can be low in calories. But if you eat several cups of microwave popcorn, the trans fat can really add up.
"Most people eat three cups at a sitting, which is three times the serving size and can have as much as 1.5 grams of trans fats," says Ward, author of The Pocket Idiot's Guide to the New Food Pyramids. "The same goes for trans-fat-free cookies that are easy to eat by the handful and add up quickly."
How to Find Trans Fats on Labels
The only way to be sure you're getting a truly trans-fat-free food is to check the list of ingredients on the label. Avoid products containing "partially hydrogenated fats or oils" (the main source of trans fats) or "shortening." Also keep in mind that some manufacturers are listing components of food ingredients separately so they can move trans fats lower on the list of ingredients.
Michael Jacobson, executive director for the watchdog group Center for Science in the Public Interest, suggests looking beyond trans fats when you're reading labels.
"There is a frozen ice cream snack that claims zero trans fat, yet has 20 grams of saturated fat in one serving," he says. "So even though it has no trans fats, it contains a day's worth of saturated fat and is anything but healthy.
"Trans fats are the worst fats, even more so than saturated fats, but you must evaluate a food on the entire profile, including calories, total fat, saturated fat, vitamins, mineral, sodium, sugar, and fiber."