You may be surprised by the ingredients that could be hiding in your pizza. founder Vani Hari said major pizza chains were reluctant to divulge ingredients in their pizza. Through an investigation, she learned that some pizza places are using ingredients that contain MSG, a flavor enhancer commonly added to Chinese food, soups, canned vegetables and processed meats.

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Hari also found that some chains add trans fats to their cheese.

Learn more about these hidden ingredients in the video above.