Yes... I think I read something about this recently, on one of the other blog sites. There is, apparently, something with milk protein, casein, that could be carcinogenous. However, the other milk protein, whey, is apparently just the opposite and helps in healing and the whole food shouldn't be a problem.
There's another substance involved, however. I think it was at Free the Animal that I read this.
Start weight: 250 - 06/2009
Current weight: 199