Eating fish at least twice a week helps our brain, improves our memory, decreases the risk of depression and increases children’s IQ, says Spanish cardiologist Guillermo Aldama, one of the leading experts on the Atlantic Diet. Spain has one of the world’s longest life expectancy and part of the secret of that longevity is a fish-rich diet. Not only is this diet beneficial to people's health, but it also is to the planet’s. Fish eating supports an exceptionally sustainable model.