How about staying lowcarb but not quite so low start at 50 carbs and see how it goes. If you need the structure there are other plans that might work better. I don't why a person with blood sugar problems would want to eat much in the starch department and anything but the fruits that are low glycemic.

Many years ago I was diagnosed as diabetic. I panicked and cut all high glycemic foods out no candies, fruit, grains etc. In 3 months I lost 30 pounds and I wasn't even trying to lose weight. I tested my blood sugar all the time and walked and walked. I'd never heard of lowcarb and have no idea if I was in ketosis but the weight sure came off fast. So don't be discouraged you can personalize lowcarb and end up with something healthy for him.