Regular, moderate exercise can increase the amount of brain tissue in the elderly and help keep their minds in good shape, a new study shows.

With all the press they are getting lately, omega-3s look to be among the superheroes of nutrition. This month, a study showed they appear to slow mental decline in those who have mild Alzheimer's disease, and Spanish researchers found that eating walnuts, rich in omega-3s, might be better for arteries than olive oil.

Diabetes, obesity, and coronary artery disease are risk factors for Alzheimer disease that can be improved with diet.