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Get the trans fat facts

You may have heard about these man-made fats, but what's so bad about them, and how do we avoid them? Are they one key to our growing obesity problem? We got the skinny on trans fats from WebMD Weight Loss Clinic Dietitian Kathleen M. Zelman, MPH, RD/LD

The opinions expressed herein are the guest's alone and have not been reviewed by a WebMD physician. If you have questions about your health, you should consult your personal physician. This event is meant for informational purposes only.

Moderator: Welcome to WebMD Live, Kathleen. To start, tell us what exactly trans fats are.

Zelman: Trans fats are basically vegetable fats that have been changed chemically by a process known as hydrogenation and typically they take a healthy fat, such as corn oil or soybean oil and make it solid. They're frequently found in foods that contain some kind of fat, such as:

  • Cookies
  • Crackers
  • Fried foods (like fried chicken)
  • French fries
  • Doughnuts
  • Margarine

The advantage is that the fat generally has a longer shelf life, or in the case like crackers, gives them a crisper texture. It's a product that's been used in food manufacturing for quite some time.

The problem is that the body treats the hydrogenated fat like it's a saturated fat, similar to butter or animal fat. As most of us know, saturated fat is the culprit that clogs arteries. So in essence trans fats, while initially a healthful oil that's unsaturated, becomes a saturated fat through this process of hydrogenation and is linked to causing heart disease.

Moderator: Recently, there was a change announced in labeling rules, so now trans fats will be required on food labels. What are we looking for on those labels, as far as numbers and amounts of trans fats?

Zelman: The new rule will not go in effect until Jan. 1, 2006, so manufacturers have plenty of time to phase in the new labels. Hopefully, we'll start to see these changes on the nutrition fact panel sooner than that.

Savvy consumers should look first at the total fat content at one serving of the food product. First and foremost the total amount of fat is the most critical aspect. As a nation we've been urged to lower our total amount of fat to less than 30% of total calories. That's the most important issue -- lowering our fat content. The second most important issue is that the saturated fat and the trans fatty acids be as low as possible. So it's better to choose a food that is higher in monounsaturated fat or polyunsaturated fat than saturated fat or trans fatty acids.

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