While working out, Stan is able to meet a personal trainer named Zack, who is depicted as being verbally abusive while also wearing a trucker's cap, and he's able to help him with his constant workout routine.
Shortly after, he is eventually suspended from the CIA for his "weight problem" when he passes out during a physical after taking just a couple of steps past the starting line.
Steve then decides to dump Debbie due to him thinking that it will help make his father feel better after believing that she was the source of Stan's weight problem.
During Steve's date with Veronica, Roger ends up going out with Debbie in the same restaurant at the same time while pretending to be part of an Anne Rice fan club.
Just then, Francine and Hayley both show up to confront Stan after they discovered his secret, and Steve becomes quite upset with his father after realizing that breaking up with Debbie didn't help him in any way.
[2] Daniel Solomon of Cinema Blend called the episode the best of the season: "The device that the writers use to display Stan's problem is both a visual metaphor for the distorted self-image of people with anorexia, as well as a narrative twist for the audience".