When new vending machines are installed in Springfield Elementary, Bart quickly becomes a junk food junkie. Bart's steady diet of processed foods shockingly leads to his massive weight gain and ultimately a heart attack. He is then put on a strict diet but is unable to adhere to it. The Simpsons perform an intervention and he is shipped off to Serenity Ranch - - A Forced Starvation Facility. He cheats on his diet there as well until he finds out that his family has turned their home into a hostel working day and night to please demanding and unfriendly foreigners to pay for his stay at Serenity Ranch. In the end, Bart smashes the vending machine that made him fat in the first place and gives the money to his family.