Poop Sandwiches?

There's an interesting article on fast food on Forbes.com this week called What's Really In Your Fast Food?. It's worth a read but I especially liked this quote:

In an interview, Jahren, who is a geobiologist and professor at the University of Hawaii, even suggested that the nitrogen isotopic signatures found in meat products were so high that they were consistent with environments where animals had consumed their own waste.

Anybody up for Mickie D's for lunch?