I just got done watching the show. He was on about halfway through the show doing a demo on the history of the cheesesteak (telling Philadelphians stuff they already knew...). He was there to plug the big Food Network show at the Ft Washington Expo Center. He'll be hosting a few rounds of Trivia Unwrapped through the weekend.
At the beginning of the show, co-host Lauren Hart mentioned DD when Marc was off camera. The other host said that they still show those shows even today. Marc shouted that he doesn't get paid a dime for them anymore. Funny stuff.
At the end of his segment, Hart dared him to eat a whole jar of Cheez Wiz. Marc said he'd opt for the physical challenge, pulling her off camera. Marc's still the best.