Competitive athletes or people who train at high levels of fitness cannot follow this diet because of low glycogens. Humans are physically impaired if you take away their carbs.
Carbs are a primary source of ATP. Theres nothing wrong with carbs, it's just a matter on how you balance you low glycemic and high glycemic carbs and keeping it at a 50-55% of your dietary intake. This also builds up your arteries when you get older.
I'm not even trying to argue with you. I used the diet for a about 3 months only to loose body fat. I'm not saying it's the new way of life or something like that. Or maybe we have a different understanding what the word "diet" means