His private medical practice in Mamaroneck, New York is devoted solely to treating diabetes and prediabetes.
[1] He worked as an industrial-management engineer and director of research, development and marketing for Clay Adams, a manufacturer and supplier of medical laboratory equipment.
In 1969, he sought to acquire a blood glucose testing kit, which at the time were only sold to doctors.
A 1993 study supported Bernstein's position that tight control of blood sugar leads to better health.
Bernstein claims however that the hypoglycemia risk is even higher with the high-carb low-fat original ADA standard diet because it requires big doses of insulin.