A Pennsylvania school district has given 'mystery meat' a new twist by providing 'mystery fat' as a fat substitute for its salad dressings.

And the good new is, the kids love it, according to an Associated Press article.

The secret ingredient is a plant-based fat substitute called Z Trim. The district began adding it to the ranch dressing served with salad and chicken for 10 months, but just told the students about the switch Thursday.

Z Trim, which has no fat, is made from the hulls of corn, oats, soy, rice and barley. It was developed by a scientists at a U.S. Department of Agriculture lab in Illinois in the mid-1990s.

Sold as a gel or powder, it can be used in dressings, dips, sauces, baked goods, processed meats, snack foods, cookies, pies and other foods. However, it can't fried.

Check out the full story and read more about Z Trim.

-- Amanda Barrett, amNY.com