While I had active CFS, I had a SPECT scan. The radiologist read the abnormal results as early Alzheimer. “Early” does not mean starting, but before the typical age of onset. At the same time, I was having severe memory issues (since disappeared).
In a recent New Scientist article, , I read how anti-tumor necrosis factor-α (TNF-α) was being used successfully for slowing the progress of Alzheimer’s Disease. I was not surprise because I was talking several anti-TNF-α supplements as part of my research approach.
- Histamines and Anticoagulants: Turmeric, Alpha Lipoic Acid reduced TNF
- Tulsi (Ocimum sanctum) 
- Neem [many studies]
On the flip side, some foods like honey  increases TNF.
Also, in my series on Crohn’s disease, many of the supplements listed were known to reduce TNF .
So if you have memory problems, you may wish to increase your anti-tnf supplements (and make sure that you check all of them to see if any increases TNF )