As odd as that sentence sounds (say it over and over again, it doesn't get any less strange) - according to this morning's Journal-Sentinel, Prince Fielder has indeed gone off the meat.
Apparently his wife is to blame, as she gave him a book detailing life in a meat slaughterhouse. Prince was so disgusted that he said he couldn't imagine eating meat again.
The whole story is here.
While this seems a little strange, it could be a boon in disguise. Prince is a big dude at a young age and anything to help him be healthy is a positive.
But don't worry, his wife says that if his power slumps at all, she'll make him a big steak.