Viewing food in and of itself as medicine, as the Ayurvedic system dictates, does have benefit over the course of ones life. In our country and in the west in general, health concerns such as Alzheimers typically aren't much of a concern until individuals actually begin approaching the age of onset. Starting to ingest beneficial natural substances such as this at that point is of limited benefit, so larger dosages have been investigated in clinical trials, actually showing some promise. But achieving these higher dosages has been something of a challenge. This is what I was attempting to communicate in my original reply.
Prior to the economic crash in 2008, I did some catalog and website work for a well-known Ayurvedic company that produces nutraceuticals following Ayurvedic principals. I've studied countless clinical trials in order to understand their products well enough to write compelling sales copy that was not just truthful but clinically sound. This can be a challenge because of FDA regulations, and so I was limited to structure/function statements. I did, however, try a number of these nutraceuticals myself, and did find them useful and beneficial, speaking only for myself.
The joint health and the male-specific herbal preparations were to me especially impressive. But, men would have to be careful because the male-specific nutraceutical actually lowered PSA levels quite a bit. There was some controversy, that this might somehow mask prostate cancer, rather than being preventative. That Controversy may well have been resolved by now.
If you come across something that you believe is actually preventative or slowing regarding Alzheimer’s I’d appreciate it if you’d ping me. My mother has it and my father’s sister had it.