It's plain as day for everyone who has even tried a natural lifestyle. People without the self-control to make a lifestyle change are going to debate around in circles all day because it's the only thing they're good at. Not even worth arguing anymore, I don't even visit the other forums (except The Lounge) because there's no real information there.
As for the bias, I think it's obvious and necessary. I don't have a problem with Dan saying what he wants because it's his site, and in the long-term it's created a community of people who can discuss it.