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It isn't mystery meat - it's more like mystery fat. And the kids in the Plum Borough School District have been eating it and liking it.
The secret ingredient is a plant-based fat substitute called Z Trim.
It's been in the school's popular ranch dressing for months, quietly reducing the fat and calories students are getting when they load up their salads and chicken with it.
"It's really good. Better than my ranch at home," says 16-year-old Juliann Sheldon, who used the dressing to top off her salad of lettuce, baby spinach, chunks of chicken and croutons.
The Plum Borough district in suburban Pittsburgh is believed to be the first school district in the country to use the fat substitute. School officials say the dressing's flavor is preserved, even though fat and calories are cut.
"Sometimes getting healthy foods into (students) isn't always the easiest thing to do, if they know about it," said Maryann Lazzaro, the district's food service manager and a registered dietitian.
The district began using the product 10 months ago, but just told the students about the switch Thursday.
"I think it tastes the same as it did before," said Tina DeLuca, 16.