This theory that Al Zheimer is due to a form of Diabetes does not have much support from the key thought leaders currently. [Disclaimer: I worked on Al Zheimer]. For all we know, it may be a combination of several factors and not a single one.
Just for your information then, "Alzheimer" is a simple name, not a compound one and "Al" here is not a prefix (if anything, it should be broken down into "alz heimer").
I am not saying they are right. I was just adding comments on what the experts in the field are thinking about. Besides, there are some clinical trials ongoing to treat "Brain Diabetes" as a way to fight Al Zheimer but nobody expects much from them, including investors. It's probably not that simple.
From "investors" word, I assume they are trying to treat it by adding medications?
What about removing carbs? Though, investors would be really disappointed..