My neighbor, upon hearing of my recent interest in Indian cooking, said that jeera (cumin seed) is very good for you— it prevents Alzheimer’s.  Intrigued, I did some research on the web.  The first article I found says a healthful compound “curcumin” is contained in turmeric, haldya or holud.

India has one of the lowest rates of Alzheimer's disease in the world. A diet rich in curcumin, a spice used in yellow curry, may offer a potential explanation and a new therapy for the brain disorder, according to a new study (2001).

http://www.youngagain.com/cumin.html

A relative of ginger, turmeric is a powder ground from the root of a large-leafed Asian plant. Researchers believe the curcumin it contains fights disease partly by shutting down a powerful protein that promotes an abnormal inflammatory response in the body.

Science Turns to Turmeric