I don't know how low carb the intervention actually was though, low glycemic load could mean anywhere from Atkins to something more like the Zone.

The low glycemic index diet for epilepsy bothers me for the same reason you give. It sounds like the sort of higher carb, lower glycemic index diet as used in the mainstream, by the name, but it's actually only about ten percent carbohydrate--more liberal compared to 4:1 or 3:1 diets, but still low enough in carbohydrate that most of the power of the diet is going to come from carbohydrate restriction rather than the nature of the carbs.

Most of my carbs do end up being low glycemic index, but that's because two and a half fruit loops really isn't as satisfying as a bunch of buttery spinach.