Fish

Essential fats are known omega-3s that have significant effects on the health of the brain. They are high in fatty fish, which are also great sources of other nutrients that support brain function, such as selenium and vitamin B12.

Due to the abundance of important nutrients, especially omega-3 fats, many studies have linked fish consumption to better mental performance and slower mental decline. One research of 76 Japanese adults found that eating more fish was associated with greater memory and brain function. Another study involving more than 17,000 schoolchildren discovered that, compared to those who had little or no fish, those who consumed 8 grams of fish daily had much better grades in German and mathematics.