This intervention is also primary in nature, given that it underlines the need for social changes, such as improved diet and education amongst the poor, to reduce the prevalence of the disorder. Source:

Israeli-Korn, S.D.; M. Masarwa; E. Schechtman; A. Abuful; R. Strugatsky; S. Avni;

L.A. Farrer; R.P. Friedland; R. Inzelberg. (2010). Hypertension increases the probability of Alzheimer's disease and of mild cognitive impairment in an Arab community in northern Israel. Neuroepidemiology, 34(2):99-105.

Behavioral

Recent studies, according to PubMed, show a mild improvement in AD patients using the herbal supplement ginkgo. One literature review studied seven trials involving 1,800 participants, all using...

The supplement trials were conducted for periods of varying duration. Patients taking a higher dose of the ginkgo extract (240 mg per day) improved in their daily functioning to a moderate degree in acts of self-care. This suggests a tertiary intervention -- using high levels of the supplement in a patient manifesting the early symptoms of the disorder may improve symptoms and reduce caregiver stress.
Source:

German Institute for Quality and Efficiency in Health Care (IQWiG). (2008). Ginkgo in Alzheimer's disease. Final report A05-19B. Version 1.0. Cologne: IQWiG. Accessed

Through PubMed October 10, 2011 at http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0005095/