Type III Diabetes?

"I think some day dementia will be seen as diabetes type III." David Ludwig, PhD

I heard part of the interview of the above author of Always Hungry and was surprised to again hear the theory that dementia may be caused by improper metabolism in the body.  His book sounds worth considering if we are going to eat in a way that supports the health of our bodies.  His book recommends good fat, little carbohydrates, very little sugar, lots of vegetables.  He also said there is no difference between the damage of sugar versus alternative sweeteners, and soda of any type is damaging.