If you’re relying on omega-3 supplements—like fish oil or algae—to ward off Alzheimer’s or dementia, you might want to reconsider. A recent clinical trial has revealed that these supplements did not enhance memory, cognitive function, or prevent brain cell loss.
“Omega-3 supplements, in general, are ineffective on their own,” stated Dr. Hussein Yassine, the lead author of the study and a neurologist at the University of Southern California’s Keck School of Medicine.
He added, “Even with elevated omega-3 levels in the brains of participants, there was no cognitive improvement.” Yassine also leads the Center for Personalized Brain Health at USC.
So, what works? He emphasized that optimizing health through exercise, stress management, adequate sleep, and a plant-based diet, while incorporating omega-3s from sources like fatty fish, nuts, and seeds, is key.
Dr. Yassine noted that in Mediterranean cultures, high levels of omega-3 correlate strongly with good cognitive health. However, people there are not merely taking supplements; they are engaging in a lifestyle of regular exercise, social interaction, and lower stress.
He pointed out, “In this lifestyle context, omega-3s truly shine for brain health. But if you’re consuming a typical Western diet full of fast food and not exercising, our findings indicate that having more omega-3 won’t make much difference.”
After years of public belief that omega-3s could help protect against dementia, it’s time for a re-evaluation, says Dr. Richard Isaacson, a researcher in Alzheimer’s prevention, who was not involved in the study. He mentioned, “Omega-3s are vital for brain health, particularly for those with the APOE4 gene that heightens Alzheimer’s risk. However, they are less effective for individuals who haven’t optimized their overall health.”
CNN attempted to contact the Global Organization for EPA and DHA Omega-3s for comments, but received no response before the article’s publication.
Omega-3 fatty acids are crucial for survival. They can lower blood pressure, increase good cholesterol, and maintain cell health, potentially reducing risks for ailments like cancer, dementia, and Alzheimer’s.
These fatty acids are vital for brain health, constituting roughly 35% of the fats in the human brain. However, the body cannot manufacture omega-3s; they must come from dietary sources such as various fish, nuts, and seeds. Given that many people may not consume enough of these foods, supplements have gained popularity.
Fish oil supplements typically provide eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), both of which play distinct yet essential roles—EPA helps with inflammation and heart health, while DHA is foundational for brain and neurological health.
Some supplements derive omega-3s from sources like chia and flaxseed oil. A third type, alpha-linolenic acid (ALA), works as an antioxidant and can reduce heart disease risk.
Walnuts are a great ALA source, offering about 2.5 grams per ounce, which is nearly double the recommended daily intake. They also pack various nutrients that supplements often cannot provide.
Eating whole fish like salmon, which is rich in multiple essential vitamins and minerals, ensures a comprehensive intake of nutrients, not just isolated omega-3s.
However, the benefits are contingent on healthy preparation—frying fish can negate its omega-3 benefits, especially when paired with unhealthy sides.
The recent randomized, double-blind, placebo-controlled trial, published in the journal *The Lancet*, involved 365 participants aged 55 to 80 without dementia but with low omega-3 levels and at least one dementia risk factor.
Almost half of the participants had at least one copy of the APOE4 gene, making them prime candidates for omega-3 benefit, according to Isaacson.
The treatment group received a daily high-dose omega-3 algae supplement for 24 months, while the placebo group did not. Both groups also took a vitamin B complex.
Participants underwent various tests during the study, including MRI scans and cognitive assessments. The data showed a significant increase in omega-3 levels in blood cells and cerebrospinal fluid post-supplement, confirming that the fatty acids reached the intended areas. However, there were no noticeable improvements in cognition or the size of the hippocampus.
“Actually, we found no significant difference between those taking omega-3s and those on the placebo,” Yassine remarked.
The findings imply that omega-3 supplementation is merely a minor factor for those leading unhealthy lifestyles. “If individuals, especially those with one or more APOE4 variants, maintain low omega-3 levels but are healthy, they can mitigate Alzheimer’s risk by consuming fatty fish regularly and using a quality omega-3 supplement,” Isaacson noted. “But for those with unhealthy habits, omega-3s alone won’t be effective.”
