They have an interview with Dean Ornish of www.pmri.org
He cites a few articles such as "A look at the Low-Carbohydrate Diet" by Steven R. Smith, M.D. (n engl j med 361;23 2009). He references this article in explaining
"that high-protein, low-carbohydrate diets accelerate atherosclerosis (blockage in arteries) through mechanisms other than traditional risk factors such as changes in cholesterol and triglycerides."
I downloaded this article and it seems that they came to this conclusion by conducting studies studies on mice. I don't know how much we as people relate to mice. But that seems a bit odd.
Smith's article did cite an article called "A Randomized Trial of a Low-Carbohydrate Diet for Obesity" by Gary D. Foster et al. (N Engl J Med 2003;348:2082-90). This study actually used a fair amount of people. Here is their summarized conclusion.
"The low-carbohydrate diet produced a greater weight loss (absolute difference, approximately 4 percent) than did the conventional diet for the first six months, but the differences were not significant at one year. The low-carbohydrate diet was associated with a greater
improvement in some risk factors for coronary heart disease. Adherence was poor and attrition was high in both groups. Longer and larger studies are required to determine the long-term safety and efficacy of low-carbohydrate, high-protein, high-fat diets."
What is missing from these studies is exercise in their test subjects. If Primal Blueprinters didn't follow the general guidelines for play or exercising, how would our increased fat and protein intake affect us?
Oh, and I have all of these articles available if anyone is interesting, just send me an message.