There is a great deal of good research being done on Turmeric for Alzheimer's. Also my father is doing well on this, but he has also recently added BHT to his regime (in case of HSV infection).
Here is some research from Japan:
Effects of turmeric on Alzheimer's disease with behavioral and psychological symptoms of dementia
Ayu. 2012 Oct-Dec; 33(4): 499-504.
We describe here three patients with the Alzheimer's Disease (AD) whose behavioral symptoms were improved remarkably as a result of the turmeric treatment, which is the traditional Indian medicine. Their cognitive decline and Behavioral and Psychological Symptoms of Dementia (BPSD) were very severe. All three patients exhibited irritability, agitation, anxiety, and apathy, two patients suffer from urinary incontinence and wonderings. They were prescribed turmeric powder capsules and started recovering from these symptoms without any adverse reaction in the clinical symptom and laboratory data. After 12 weeks of the treatment, total score of the Neuro-Psychiatric Inventory-brief questionnaire decreased significantly in both acuity of symptoms and burden of caregivers. In one case, the Mini-Mental State Examination (MMSE) score was up five points, from 12/30 to 17/30. In the other two cases, no significant change was seen in the MMSE; however, they came to recognize their family within 1 year treatment. All cases have been taking turmeric for more than 1 year, re-exacerbation of BPSD was not seen. The present cases suggest a significant improvement of the behavioral symptoms in the AD with the turmeric treatment, leading to probable benefit of the use of turmeric in individuals with the AD with BPSD.
In India alzheimer is almost non existent and cancer is more rare, especially male types of cancer. Researchers found that it has to do with the consumption of large quantities of turmeric (also known as kunjit) in the curry. Especially the combination of chilly powder, turmeric and cauliflower and broccoli seems to do the trick. If you prepare a curry don't just use the herbal mix form the grocery but add your own paste of vegetable oil (arachide, sunflower or sesame oil), chilli powder and turmeric powder. Wash and cut the cauliflower and broccoli and let them sit for 15 minutes before cooking, as this improves the health benefits.