All the fans of the show knew he had drug/alcohol problems, you can even know which years were the worst for him.
Season 3 (1996/1997), he was almost anorexic, scrawny as hell.
Then he went to rehab and looked normal in season 4, then he had a relapse and to overcome this relapse: food became his new addiction, he looked more and more chubby as season 5 and 6 went through. He reached a peak of weight in the season finale of season 6.
Season 7 (2000/2001), between season 6 and 7, probably tired of his chubby look, he went back to drugs and alcohol. He lost tons of weight in a very small amount of time, and it was obvious it wasn't sports. Then he probably went to rehab and replaced his addiction by food again, at the end of season 7 he was chubby again. He kept this look for all of season 8. Then during season 9 he went back to a normal weight, similar to the weight of season 1/2, same for season 10.
I've watched this show too many times
