I haven't read "Good Calories, Bad calories" but I would suggest it also. It would fill the gap in your knowledge in this case.
Several people are thriving on meat only. In this case you might lookhttp://www.dirtycarnivore.com
forum. There are several studies under the scientific section.
I looked through the site and they are misinformed themselves. First of all the paleolithic diet contained a lot of plant material including seeds and roots. I have been over all this before with other people and posted all sorts of evidence to prove this fact.
They also make mention that the compounds in plants such as alkaloids can evoke an immune response. So what? Many of these alkaloids can also prevent allergic responses such as ephedrine, pseudoepehdrine, etc
Furthermore they are apparently unaware of the well known fact that animal PROTEINS happen to be very common allergens. So why are they trying to mislead people about the real facts?
This is a great example of why I tell people to do their own independent research and not rely on claims from sales and opinion sites for their "facts".