"...it has been qualified as a fad diet by the National Health Service of England and American Dietetic Association."
"A criticized 3 week trial with the Paleolithic diet, in 20 healthy volunteers of which 6 dropped out and only 6 of the remaining had complete dietary information available, showed variable results. During the trial calorie consumption decreased 36% leading to significant weight loss. However, adverse changes in serum calcium were observed.[147] The NHS Knowledge Service states that there are several limitations to this particular study and that "readers should not draw too many conclusions from it."[148] Also, the Halford Watch refers to this study as "bad science".[149]"