|MadSci Network: Neuroscience|
This is a difficult question, in that we still are not sure if there are certain "brain healthy" foods. While developing as fetuses we know that healthy brains need oxygen, and caloric support but as to specific foods it just isn't known. I think you need to think about what is healthy for the body as a whole is probably healthy for the brain. This includes the appropriate vitamins, minerals, proteins, fat, and carbohydrates that vary per age and gender. We know when the body and brain has been starved that a person does not think nor function as well. Some diets are healthier than others this includes diets that have more fruits and vegetables, using oils that are monounsaturated such as canola and olive oil, increasing intake of fiber, increase garlic intake (this may potentially help lower LDL or the "bad cholesterol"), eat less butter and margarine, eat less fatty meat, and use milk products with less than 2%fat. If a person can follow these things the brain should be healthy also.
Try the links in the MadSci Library for more information on Neuroscience.