Is Bart Simpson fat

In one episode he weighted 239lb, and another much later episode he weighted 241lb. However he weighted 260lb in Season 2 episode 18 intitled "A brush with greatness"he was trying to lose the weight by dieting. The most he has ever weighted was 315lb in the episode intited "King Sized Homer"(Season 7 episode 7).The least he has weighted was probaby 140lb-150lb, I don't know the exact weight but that took place in the 12 season 15 episode intited "Hungry, Hungry Homer".