1. Brain Foods – Walnuts. Interestingly enough, walnuts actually resemble small brains. Perhaps this is a clue that we should eat them. A study conducted in the 2007 found that a diet including more than 2% walnuts was able to reverse brain aging, including age related motor and cognitive defects. Walnuts are rich in antioxidants which fight against free radical damage to the brain cells’ DNA.