“You are what you eat,” right? Well, according to the National Institute on Aging (NIA), what you put into your mouth could be influencing your cognitive health and performance. A healthy diet of fruits, vegetables, lean meats, fish, poultry, low-fat/nonfat dairy products, and whole grains is essential, as is limiting fats, sugars, and salt. But here is the best of the best when it comes to boosting the brain.