I am pretty sure Dr. McDougall is vegan not vegetarian.

My husband went to a McDougall lecture at the VegFest in Portland 2009. Afterwards, he came home telling me that olive oil and most oils are bad, and that people should eat foods in their whole form - such as eat olives not olive oils. A friend couple of ours are followers of the McDougall diet, and they eat oil-free as much as possible. I personally don't adhere to this prescription but I can see the merits of this diet path.