His major contentions are that this diet must be deficient in vitamins and minerals because it does not include grains and dairy, and is (in his view) too expensive to feed a teenage boy. That was actually a real argument on his part.
Those nutrients which are found in fortified grains (bread, pasta, rice) and dairy are found in much lower levels compared to the wide spectrum of fruits, vegetables, nuts and seeds your typical "paleolithic dieter" consumes.
Have questions as to whether you're getting the necessary amounts of vitamins, minerals and other nutrients from your diet? Consult a Naturopathic doctor- a doctor who's also an expert in nutrition! You deserve the best information and guidance, it's your health we're talking about here!
Thank you for reading, please contact me with questions, comments and feedback!