This is a great book by Michael Pollan:
The Omnivore's Dilema (I think it's the one you guys were alluding to above.
I am an omnivore myself. Vegetables. Meat. Dairy. It's all good.
To me the conversation isn't about whether to eat meat or not. The conversation should be about sustainable, humane and healthy ways of harvesting our food. The industrialization of our food supply has contributed greatly to our own lack of health. There are better ways to make our food and there are much healthier ways to consume it.
I think we need to take a long hard look at what we've been eating, how much of it we eat and how it is produced.