A study of 2,200 people in their 40’s and 50’s found that the higher their levels of omega-3, the better they did in a test of complex reasoning. Omega-3 comes mainly from eating oily fish such as salmon and mackerel. Three quarters of those with the highest levels had a larger hippocampus, the brain region linked to memory and is suggested to delay dementia as people have more brain cells to lose before suffering memory loss.
In the study published in the journal Neurology, the study group was likely to have eaten at least one serving (3g) of oily fish a week.
