A new study suggests that foods rich with the antioxidant called flavonoids, especially berries, may offer protection.
It's believed flavonoids may be bolstering the ability of nerve cells to handle oxidative stress.
But not all flavonoids are created equal.
Those found in berries and other red or purplish fruits and vegetables were the ones that protected both men and women.
The study was funded by the National Institutes of Health.