Protein..

Protein is found in every cell of the body including the brain, so it's important to get enough of it through your diet. That said, of all the protein-rich foods out there, some may benefit your brain more than others.

As for which proteins support your brain the most, we asked a neurologist who told us that you can support your cognitive functioning over the years by adding more fatty fish to your routine.

Fatty fish, which includes salmon, black cod, anchovies and bluefin tuna, is high in protein and other nutrients like omega-3 fatty acids (a type of "healthy fat"), making it a nutritious addition to any diet.

For example, a 6-ounce filet of cooked salmon provides 43.2 grams of protein and 246 percent of your Daily Value (DV) for omega-3 fatty acids, per the USDA.