Reba - Season 5 Episode 7
Have Your Cake

Realizing that his wife, Barbra Jean (who was pregnant in real life at the time this episode was taped), has taken up eating as a hobby and gained quite a bit of weight as a result, Brock consults Reba on how best to handle the delicate situation. Ultimately, Cheyenne is the one who confronts Barbra Jean about her food addiction, suggesting that she and Reba go on a diet with her.