Those of us who saw him in HS and community college in KC know that he hasn't changed much in size or appearance since then.
If he's on the juice, it's well hidden. Contrast that Barry BOnds' vast body changes over the last 10 years.
Well, if Pujols was 245 pounds in high school, I would be surprised. But regardless, there are all kinds of different anabolic steroids and HGH derivatives that professional athletes are using. Some bring about dramatic noticeable physical changes and some are more subtle. The effect also varies depending on each player's chemical makeup and how their body reacts to this stuff as opposed to how some other guy's body reacts to it. That's one of the reasons why some guys immediately start getting injured once they go on the juice, and other guys, like Bonds, don't.