That's an interesting study, but like Oak, I tend to believe that my body does better on more protien. Additionally, I've recently discovered that my mood swings to the 'dark side' when I don't get enough fresh veggies in my diet (daily), so it really, really is a balancing game.

I think that part of it is quality of life versus quantity. Maybe I could live longer if I ate less protien, but then I'd be hungrier, have less energy and less ability to do the things I love doing...so it's kind of a trade off.