I can see why this would work. It cuts out all of the processed junk that is in the modern american diet. I mean, how many cavemen had diabetes?
I think developing type II diabetes was impossible for our hunter-gatherer ancestors. Carbohydrates are not abundant in the wild, they would have consumed much less carbohydrates and refined sugar.
Low Carb High Fat diets are becoming more popular. Many doctors are having success treating diabetes using this diet.
It is hard to go on any type of restrictive diet. Madison Avenue does a very effective job at getting people to want food that is not healthy. Education is the key and even our schools feed us unhealthy items.
What's important is that you cut down carbs and fats, which causes obesity. Obesity is one factor associated with DM II. Plus, exercise is necessary.
There is research going back to the 1980's which proves that type II diabetes can be reversed with a proper diet that is low in carbohydrates and focuses on using healthy forms of fat. UCLA even did a study on it and found that most would even show improvement in as little as three weeks.