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How do you limit these harmful fats? Print out this list of 10 foods to beware and take it to the supermarket!

Trans fatty acids -- better known as "trans fats" -- have emerged as the food industry's newest bad boy.

Trans fats are formed during a process called hydrogenation, which converts a relatively healthy, unsaturated liquid fat -- like corn oil or soybean oil -- into a solid one. This gives the fat longer shelf life, so it's convenient for restaurants and food manufacturers.

The problem: The body treats hydrogenated fat more like saturated fat, like butter or animal fat. Saturated fat has long been known to clog arteries -- and some studies indicate trans fat may be a bit more evil. But on food labels, trans fatty acids are not included under "saturated fat."

What to Do, What to Do...

To help consumers, the Food and Drug Administration is requiring that all food labels list trans fats by January 1, 2006. Until then, how can you know which foods are safe and which contain these stealth fats?

For guidance, WebMD turned to the nation's nutrition gurus -- the experts at the American Dietetic Association (ADA).

"Until now, consumers were really in the dark about trans fatty acids. In fact, most people are probably very confused right now," says Cindy Moore, MS, RD, an ADA spokesperson. Moore is also director of nutrition therapy at the Cleveland Clinic Foundation.

Here are four ways you can make healthier choices at the supermarket. Immediately below these suggestions, we list the top 10 types of food loaded with trans fats. Print out this list to become a wise, safer shopper.

#1. Limit or avoid both saturated and trans fats types of fat.

There's no magic number to shoot for here, no "X" grams of trans fatty acids allowed in your daily diet, Moore tells WebMD. Just realize that the more fast food and packaged food you eat, the more trans fats you are getting in your diet.

#2. Use nutrition labels to estimate the trans fat content in a product.

Add up the saturated, monounsaturated and polyunsaturated fat. If they are less than the "total fat" number, the remainder is likely trans fat, says Moore.

#3. Remember: Reduced-fat and fat-free foods will have virtually no trans fat in them.

#4. Look for the term "partially hydrogenated oil" on the package ingredients list.

If partially hydrogenated oil is first on the list -- the product may contain trans fat.

Some manufacturers have already changed their recipes and formulas to reduce trans fats to less than 0.5% of fats. The ingredient list may state "partially hydrogenated oil," but if the packaging says "Contains No Trans Fats," you can believe it, says Moore.

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