Hi Scan
As per subject, I just reported on salutary results on Blood Pressure, Cholesterol (HDL & LDL) levels, & weight.
Atkins discusses your doctor's concerns in his book; says ketones produced by the diet is totally different situation from diabetes. I wouldn't recommend the diet unless you read Atkins book, "Dr. Atkins New Diet Revolution", wherein he discusses this issue. Constipation does occur during induction phase, and can be dealt with.
I understand the medical and dietary establishments have said the diet is dangerous, but the diet's 30 years old, has been used by thousands, and there has been no major increase in death and calamity among users; only weight loss, lowered Blood Pressure & cholesterol levels, and prevention of diabetes. However, I am not medically qualified either; just reporting my success.