You would think, but it seems like players in the past who were notorious for being fat or heavy and had a lot of power, who then went on to lose weight and get in better shape before a season, would often have lower power numbers. But then again I'm only really recalling Prince Fielder when he took on that vegetarian diet after his 2007 breakout year, lost weight, and then lost over 100 points to his SLG and OPS, so I really don't have a lot of frame of reference. There haven't been a lot of "fat" power hitters out there. Off the top of my head I can only think of David Ortiz, Mo Vaughn, Cecil Fielder... and I'm drawing a blank now. Babe Ruth Rusty Freaking Staub and Greg Luzinski were the fat power hitters I remember from my childhood. John Kruk is someone I remember from the 80s. Kruk wasn't really much of a power hitter.