I hate to say this, but from what I read he was low on calories 4-5 weeks, not months. I'm also thinking he was sneaking more than a couple of salads and some water in a day. In the end I don't know if gaining 12% body weight is that awful in 2 months, although I agree it's not optimal. I don't know what he does normally in the offseason, but it may not be much. Some of these guys don't have to work that hard to compete,they just have most of it naturally.
My thought is he was depressed after the season between how he played, the team did and what happened to Demar and let himself go. So he got back on track and went from there.
Being an offensive lineman in the NFL is not a study on healthy living.