If he is undertreatment for Alzheimer's I would expect him to be taking Donepezil and Namenda.
If they even suspect Alzheimer's they should know he will be basically out of his mind in a year or two.-Tom
In dementia, the brain has a problem taking in glucose, as the cells have become insulin resistant.
Ketones are readily accepted by the brain, and are the preferred fuel.
In extended fasts, the brain has been shown to run on 66% ketones, 33% glucose.
It has been shown about three tablespoons of MCT oil (throughout the day) can restore about 10% of brain function. MCT oil is rapidly converted to ketones in the liver.