Do you know that there’s silly putty hiding your food? Apparently there is, and lots of it, too. According to food activist, Vani Hari, also known as the Food Babe, the chemical called dimethylpolysiloxane is found in many of the foods we consume.

Not only is it used in the gooey children’s toy, but it can also be found in caulks, adhesives, aquarium sealants, polishes, cosmetics and silicone-based lubricants to name a few. The Food and Drug Administration (FDA) first approved its use in 1998 and popular fast food items like, Chick-fil-A Chicken Sandwiches, McDonalds French Fries, KFC Mash Potatoes and Biscuits, Taco Bell Cinnamon Twists, Five Guys French Fries, and Dominos Bread Sticks all contain this ingredient, Hari points out on her popular blog.

“The FDA allows dimethylpolysiloxane to be preserved by several different chemicals that don’t have to be listed on the label either, including formaldehyde,” Hari writes.

Dimethylpolysiloxane is also a foaming agent made of silicone that’s a staple in the famous McDonald’s chicken nugget. Despite no conclusive findings from the World Health Organization (WHO) linking the chemical to any specific disease, there may be some potential health risks. Marion Nestle, a New York University professor and author, says that dimethylpolysiloxane might not pose any health risks, but she advocates for not eating any food with an ingredient you can’t pronounce, CNN reported.

Conversely, physician and author, Dr. Joseph Mercola says that non-food ingredients, especially those found in McDonald’s foods, can seriously harm your health. “This shouldn't come as any great surprise,” he writes in the Huffington Post, “After all, how healthful can something be that shows no signs of decomposing after being left on a counter for more than a decade?”

Proven health risks or not, if you’re eating fast food, you’re most likely eating an ingredient found in non-food items. Are you eating silly putty?