Mark Bittman writes in the New York Times’ Opinionator column today:
In limited quantities, meat is just fine, especially sustainably raised meat (and wild game), locally and ethically produced dairy and eggs, the remaining wild or decently cultivated fish.
No matter where we live, if we focused on those — none of which are in abundant supply, which is exactly the point — and used them to augment the kind of diet we’re made to eat, one based on plants as a staple, with these other things as treats, we’d all be better off. We can’t afford to wait to evolve.
Interesting, quick read about the global trend towards eating more and more factory-farmed meat and non-local produce: http://opinionator.blogs.nytimes.com/2011/05/31/meat-why-bother/