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In mouse brains exposed to repeated mild impacts, repair of tiny blood vessels faltered when EPA levels were elevated.<\/p>\n
By tracing those changes, neuroscientist Onder Albayram at the Medical University of South Carolina (MUSC<\/a>) documented how EPA redirected the brain\u2019s recovery away from rebuilding damaged vessels.<\/p>\n Early recovery after injury appeared normal, but months later the same brains showed worsening movement and memory problems.<\/p>\n That delayed pattern points to a hidden vulnerability that only emerges over time, setting up the need to understand why EPA behaves differently from other omega-3s.<\/p>\n EPA vs. DHA<\/p>\n Fish oil contains omega-3 fatty acids<\/a>, fats the body uses in cell membranes and signaling, but its two main players behave differently.<\/p>\n One player, docosahexaenoic acid (DHA), helps build nerve-cell membranes and tends to stay built into brain tissue.<\/p>\n EPA, in contrast, is less fixed in those membranes and can enter injury-related metabolism.<\/p>\n Under repeated injury, that freer chemistry mattered, because the brain appeared to use EPA in ways that narrowed repair options.<\/p>\n Injuries changed the stakes<\/p>\n Repeated mild head injuries<\/a> can stretch recovery, especially when a person has had earlier concussions or repeated impacts.<\/p>\n In the mouse model, seven mild impacts over nine days produced similar early recovery times across diets.<\/p>\n Months later, fish-oil-fed injured mice performed worse on movement scores and spatial learning than the other groups.<\/p>\n That delay matters, because a supplement may look harmless during early healing while changing the brain\u2019s later repair path.<\/p>\n Brain blood vessels and EPA<\/p>\n Microscope work tied the behavior changes to the neurovascular unit, the brain\u2019s small-vessel support system.<\/p>\n Tiny vessel linings showed thickened support layers, narrowed openings, and stressed cell<\/a> nuclei after repeated brain injury exposed to EPA from fish oil.<\/p>\n Blood flow responses also weakened when sensory stimulation should have pulled more blood toward active brain tissue.<\/p>\n Even so, the blood-brain barrier, the border protecting brain tissue from blood contents, did not show major leakage.<\/p>\n Repair signals weakened<\/p>\n At the gene level, injured brains on the fish-oil diet turned down programs needed for vessel repair.<\/p>\n Those programs help angiogenesis, the growth of new blood vessels, by guiding vessel-lining cells into stable networks.<\/p>\n Support proteins that hold vessel walls together also fell, while genes tied to fat handling became more active.<\/p>\n That pattern suggests EPA did not poison the brain outright, but nudged injured vessels away from rebuilding.<\/p>\n Human cells confirmed<\/p>\n Human vessel cells gave the MUSC group a cleaner test of whether EPA itself could weaken repair.<\/p>\n Researchers exposed the cells to EPA or DHA while pushing them to use fatty acids, a fuel source from fats.<\/p>\n Only EPA reduced network formation, slowed wound closure, and weakened tight contacts between the cells.<\/p>\n That cell result strengthened the mouse finding, because the same repair failure appeared without the whole animal\u2019s many variables.<\/p>\n Disease tissue echoed<\/p>\n Donated brain tissue added a human clue, though not a direct test of supplement exposure.<\/p>\n In six men with chronic traumatic encephalopathy, a disease tied to repeated head impacts, and six controls, researchers measured fats and gene activity.<\/p>\n The disease tissue showed about 150% more EPA and DHA, plus an 80% rise in a fat linked to inflammation.<\/p>\n Those samples cannot prove fish oil caused damage, but they showed a matching pattern of vessel<\/a> and fat-use disruption.<\/p>\n A narrower warning<\/p>\n Popularity makes the finding harder to ignore, because many people treat fish oil as a simple health booster.<\/p>\n \u201cFish oil supplements are everywhere, and people take them for a range of reasons, often without a clear understanding of their long-term effects,\u201d Albayram said.<\/p>\n The result does not tell healthy adults to stop eating fish or discard supplements after one headline.<\/p>\n Instead, it warns that repeated head injury may change how the brain<\/a> handles one fish-oil ingredient.<\/p>\n Limits still matter<\/p>\n Several boundaries keep the finding from becoming a blanket medical rule. Animal experiments used male mice, and the donated disease samples also came from male donors.<\/p>\n Researchers lacked full details on each donor\u2019s diet, supplement history, medications, and vascular health.<\/p>\n \u201cI am not saying fish oil is good or bad in some universal way,\u201d Albayram said.<\/p>\n Brain repair needs context<\/p>\n The evidence frames EPA as a nutrient whose brain effects depend on injury, timing, and metabolism, not one fixed promise for every person who buys a bottle.<\/p>\n Future work from the MUSC group should track how EPA moves through the body and test whether different omega-3 choices can support injured vessels.The study is published in Cell Reports<\/a>.<\/p>\n \u2014\u2013<\/p>\n Like what you read? Subscribe to our newsletter<\/a> for engaging articles, exclusive content, and the latest updates.<\/p>\n Check us out on EarthSnap<\/a>, a free app brought to you by Eric Ralls<\/a> and Earth.com.<\/p>\n \u2014\u2013<\/p>\n","protected":false},"excerpt":{"rendered":"Researchers have found that a common fish oil component, eicosapentaenoic acid (EPA), impairs the brain\u2019s ability to repair…\n","protected":false},"author":2,"featured_media":637579,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[36],"tags":[49,48,84,395],"class_list":["post-637578","post","type-post","status-publish","format-standard","has-post-thumbnail","category-nutrition","tag-ca","tag-canada","tag-health","tag-nutrition"],"_links":{"self":[{"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/posts\/637578","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/comments?post=637578"}],"version-history":[{"count":0,"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/posts\/637578\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/media\/637579"}],"wp:attachment":[{"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/media?parent=637578"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/categories?post=637578"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.newsbeep.com\/ca\/wp-json\/wp\/v2\/tags?post=637578"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}