Click the play button on the video window to the right to see the videoPHOENIX -- One trip to the grocery store and it's easy to find products that say zero trans fats.
But even with zero on the bag, you'll find ingredients like partially hydrogenated soybean oil. That is a trans fat.
A week after our story aired, Congressman Steve Israel of New York sponsored a bill called, Trans Fat Truth in Labeling Act of 2009.
Right now, measurements on a nutrition label can be off by 20%.
Here's a hypothetical example. Let's say there is .6g of trans fat per serving. Manufacturers can get away with saying it is .48g.
And if that new total is less than .5g, they are allowed to write 'zero'!
Israel's bill specifically addresses that issue. It states, if the food is less than point five grams then it should say so instead of zero.
And experts say that's not good for you. Trans fats provide a double whammy... They raise bad cholesterol and lower good cholesterol.
Studies show that just five grams of trans fat a day could increase your risk of heart disease by 25%.
For the original investigation, we asked the 18 companies in our story for comment.
Five told us they are in compliance with FDA guidelines and two told us it’s only in their seasoning, but still fall under guidelines.
But they won't be if Congressman Israel gets his way. Manufacturers will have 18 months to change their labels or simply get rid of their trans fats.