It's not the conversation one would expect to have with a professional fighter, particularly one who is fighting in a third different weight class, 35 pounds south of where he began. Lorenz Larkin, who began his mixed martial arts career as a 205-pound light heavyweight, said that one of the difficulties in competing as a welterweight is being forced to stay away from the fast food burgers he loves so much. Larkin, who faces heavy-handed Albert Tumenov Saturday in one of the better matches of UFC 195 at the MGM Grand Garden Arena, is his own man.