I don't remember if Taubes said it in GCBC but I know he mentions in Why We Get Fat that there is no scientific evidence showing that vegetables will improve your health. I personally like the taste of vegetables with my meat and I don't think it hurts your diet at all. Some of the benefits are that it can help alleviate constipation (when you eat mostly protein and fat people tend to get constipated), and veggies will also help balance your PH since meat is mostly acidifying and veggies are generally more alkaline.
"If man made it, don't eat it" - Jack Lallane
People say I am on a "crazy" diet. What is so crazy about eating veggies, fruits, seafood and organ meats? Just because I don't eat whole wheat and processed food doesn't make my diet "crazy". Maybe everyone else with a SAD are the "crazy" ones for putting that junk in their system.