Snack on nuts (and pass on the packaged stuff)

Nuts may be high in calories and fat, but they're packed with fat-soluble vitamin E, known for its brain-protective qualities.

Grab a handful at least five times a week instead of processed snacks like chips or pastries. Check the list of ingredients and opt for the dry-roasted or raw, unsalted kind without extra sodium, sweeteners or oils. (Hint: No-stir peanut butters have stuff added.)