08/15/2011 03:19 pm ET | Updated Oct 15, 2011

Cast Of 'It's Always Sunny In Philadelphia' Introduces Fat Mac (VIDEO)

Fans of "It's Always Sunny In Philadelphia" are well-aware of Rob McElhenney's 50-lb weight gain for season 7, having already seen the teaser for the new episodes. But AOL recently stopped by the set to chat with the star's compatriots to find out how they're adjusting to the new Fat Mac. They seem to be vacillating between giddy amusement and tentative concern.

What do you think of actors losing and gaining weight for roles? More importantly, if you had to gain 50-lbs for a role, what would you eat?