Firstly, I'll state that I am a Dodger fan...
Secondly, most of the reports I've read say he's gained 20 pounds of muscle...officially, on the Dodgers site at MLB.com he is reported as gaining 25 pounds of muscle.
Thirdly, if it's not muscle, he's not going to be able to lie about it for long...hence, why lie in the first place...and since Lo Duca is a stand-up guy in my book, I can't see him lying or using steroids period.
Gaining 20 to 25 pounds of muscle in 6 months, using only natural supplements, is not a medical impossibility...nor would I say it's even a medical improbability if the person is dedicated enough...I've gained 20 pounds of muscle in 3 months before, drinking only whey protein shakes to supplement my workouts...of course, I went from 170 to 190, while Lo Duca's gone from 185 to 205/210...and while I have a few inches on Lo Duca, he wore out and lost weight during last season, so some of that weight was replacing former mass he already had.
I think someone wrote that professional body builders can't gain 30 pounds of muscle in a year...I completely agree...but because body builders have already nearly maxed out the possible muscle that they can obtain, they are less likely to put on more muscle mass at any sort of significant rate...a normal person can gain muscle with relative quickness, with a large calorie intake, lots of protein, and a rigorous workout regemine.
Lastly, I'm sure he was disappointed the way he's tailed off the past two seasons after the break. I think it's logical that he would try to make himself stronger/more fit. And Lo Duca using steroids just seems absurd to me. He is a role model for Italian-Americans and he is fully aware of the responsibilities that come along with that job. He is constantly giving back to the community and I have seen or heard nothing that would indicate to me that he is using.