Low glycemic is not low carb, but instead refers to the glycemic index of the food. To oversimplify, how fast the particular starches (complex carbohydrates) are broken down into simple sugars. Professional bicycle racers consume up to 7000 kcals per day, sometimes more, yet most of the carbohydrates are of low glycemic value (considering that the professional road races can be anywhere from 4 to 8 hours).
The blood sugar response and attendent insulin response is blunted in both Low Carb and the so called "Low Glycemic" diets. The "low Glycemic" diets are the first steps for the medical establishment toward "discovering" what Atkins was saying 30 years ago. It is all in the insulin level and dietary ketosis.
Mark my words - within 4-5 years we will hear from these same twerps that dietary ketosis is good for you. It used to KILL YOU.