I was just reading in the maizagne, taste for life , March 2013 and article of interest to tai chi practitioners. The article on page 46, states, A healthy diet and plenty of exercise go hand in hand in helping to prevent Alzheimer's disease and related cognitive decline as we age. If you're looking for a good exercise option, consider tai chi. Researchers found increases in brain volume and improvements on test of memory and thinking in older adults who practiced tai ch three times a week. Studies have shown that dementia and the gradual cognitive decline that precedes it are linked to shrinkage of the brain as nerve cells and their connections are lost. Speaking from personal experience and as a senior citizen, tai chi has improved my quality of life.