Joba Chamberlain is a topic of conversation for gaining about 15 pounds.
Excess weight does not necessarily make a for bad pitchers.
Check out a list of familiar names with hefty frames and their career won-loss record:
Babe Ruth (94-46)
Cy Young (511-36)
Wilbur Wood (164-156)
Fernando Valenzuela (173-153)
David Wells (239-157)
Luis Tiant (229-172)
Bartolo Colon (153-103) In spring training with the Yankees.