Tomorrow We Diet! (1951)

Indeed, man craves to eat and George Geef (Goofy) is no exception. He eats like it's going out of style. Finally, his reflection in the mirror tells him he's getting too fat. Goofy starts showing all the signs of being overweight. When he gets into a taxi, the back tires deflate. When he gets into an elevator, the elevator remains grounded. Goofy's reflection "helps" him lose weight by refusing to let him eat. Geef thinks he can resist but is soon upset by all manner of temptations. He goes to bed but sleepwalks to the refrigerator only to discover it is empty. It turns out his reflection ate all the food telling him, "Eat, drink, and be merry, and tomorrow we diet!"