Sam....I find that very interesting.
Some years ago at GF I went on what was then called the Atkins Diet.
According to the Atkins book I had to also used Ketos sticks to measure effectivness of the diet on my urine.
My British Aviation Doctor went ballistic at my six monthly renewal when he asked me if I was dieting and said he would ground me unless I ceased this diet immediately and rightly or wrongly he said Ketos production in urine was a first sign of diabetic coma.
I have no real opinion either as I have had no medical training but I felt pretty rough on this diet and suffered constipation.
However I did loose weight quickly.
Further more today the local Norfolk & Norwich Hospital here was reported in the local press not to prescribe the Atkins diet but no reason was published. From what I hear down the pub most of the blokes wives are on it and if they loose enough weight it will be worth going home sober!