"Established science on seafood and health," said the group, "indicates that his claim of having sushi-related mercury poisoning is likely to be false."

Piven said last week he was leaving the production because his doctor had diagnosed him with mercury poisoning, related to his intake of sushi and Chinese herbs.

Click here to read a Boston Globe story on Piven and his alleged mercury posioning.

"The entire medical literature doesn't contain a single documented U.S. case of mercury poisoning from eating fish sold in restaurants and supermarkets," said CCF Director of Research David Martosko.