Including seafood or other foods containing omega-3 fatty acids at least once a week in your diet may protect against age-related memory loss and thinking problems, says a study.The age-related memory loss and thinking problems of study-participants who reported eating seafood less than once a week declined more rapidly compared to those who ate at least one seafood meal per week."This study helps show that while cognitive abilities naturally decline as part of the normal ageing process, there is something that we can do to mitigate this process," said study senior author Martha Clare Morris from Rush University Medical Centre in Chicago, US.