FDA warns Parmesan fraud has become a serious problem for American consumers. Tests show products described as "100 percent Parmesan" routinely have cut-rate substitutes — like wood pulp, and cheaper cheeses such as cheddar, Swiss, and mozzarella. Apparently wood pulp in grated cheese products is used for a long time, mostly because cellulose in it helps prevent the grated cheese from clumping together while inside the package. http://www.grubstreet.com/2016/02/parmesan-cheese-fraud.html?mid=twitter_nymag I've never been fond(u) of parmesan, mostly because of its weird taste. Now I know why.