Big Mac, hold the isotopes, please!

I admit to eating a couple if Big Macs a year. And yes, I read Michael Pollan's Omnivore's Dilemma, so I do so with a certain amount of guilt and shame. But I may finally be forced to go cold turkey(burger?) and give them up for good, especially after reading this article on Forbes website that I was alerted to on Mark Bittman's bitten blog about what exactly may be in that 100% all beef patty. Ah, McDonald's, we had a good run, but I'm afraid it's over. It's not me, it's you!