Mental abilities don't necessarily go downhill as we grow older. Alzheimer's disease is not a part of normal again, and many supposedly age-related changes such as memory loss may be related to lifestyle factors like eating, exercise stress and how much you use your brain. Healthy choices can prevent or delay some conditions that affect the brain, like stroke, heart disease and diabetes. Some researchers believe that similar choices can help delay or prevent the onset of Alzheimer's as well.

The bottom line? You can keep your mind sharp and healthy--and eating good food is a great first step.