Eat seafood meal once a week to stay sharp

The study group also completed annual food frequency questionnaires, allowing the researchers to compare participants' reported seafood intake with changes in their cognitive abilities as measured by the tests.The questionnaires included four types of seafood: tuna sandwiches; fish sticks, fish cakes and fish sandwiches; fresh fish as a main dish; and shrimp, lobster and crab. The participants were divided into two groups: those who ate at least one of those seafood meals per week and those who ate less than one of those seafood meals per week.