Exercise is linked to a lower risk of Alzheimer's disease among older people; now, research shows it can prevent brain fog at a much younger age, too. Japanese researchers assigned sedentary young adults to two groups; one took aerobic exercise classes, and the other did not. After 4 months, MRIs revealed that the nonexercising group experienced shrinkage of gray matter in some areas of the brain, while the active participants had no change.
Do this: Try a new fitness routine, or sign up for a new class at the gym. Besides the obvious benefit of getting a workout, trying something fresh can help stimulate the growth of brain cells.