From MSN:

"As far as pizza toppings go, there's one ingredient that no one likes to see on their pie—and no, we're not talking about anchovies. We're referring to phthalates [PLASTIC!]. Researchers from The University of Texas Health Science Center at Houston recently examined 72 supermarket staples and discovered traces of the chemical in several groceries, including prepackaged pizza, meats and beverages. While the levels of the toxins still fall under what the Environmental Protection Agency considers safe, scientists are alarmed that this toxic compound is making its way into our diet at all. How did these chemicals leech into our dinner in the first place? Lead investigator, Arnold Schecter, MD, believes plastic packaging could be the culprit."