Fish oil supplements have long been linked with a variety of brain benefits , but new research suggests that one of the omega-3 fatty acids these supplements contain could interfere with the brain's repair processes. A study of mice affected by mild traumatic head injuries showed that animals fed with diets containing the omega-3 fatty acid EPA ( eicosapentaenoic acid ) performed worse on spatial memory and learning tasks after the injuries. Rather than omega-3s aiding recovery as previous