Have you been popping omega-3 pills hoping to improve your memory or keep your brain sharp as you age? New research suggests they may not deliver the cognitive benefits many people expect.A clinical trial, published in the journal eBioMedicine, found that omega-3 supplements did not improve memory, cognition, or brain health in older adults at risk of Alzheimer's disease.Omega-3 fish oil and algae-based supplements have long been promoted as a way to protect against dementia and Alzheimer's disease. However, the new randomized, double-blind, placebo-controlled trial — considered the gold standard in medical research — found no evidence that these supplements slowed cognitive decline or protected the brain.The study was led by researchers at the University of Southern California and included 365 adults aged 55 to 80 who rarely consumed fish, a natural source of omega-3 fatty acids."We all wish there was a silver bullet for preventing Alzheimer's, but our findings showed that fish oil supplements do not appear to protect brain health," said Hussein Naji Yassine, director of the USC Center for Personalized Brain Health and lead investigator of the study."While omega-3s play an important role in forming brain cell connections needed for cognition, our results do not support fish oil supplements as a preventive measure against Alzheimer's," he added.How The Study Was Conducted?Also read: Kim Kardashian Says She Takes 35 Supplements Daily, Suffers From 'Pill Fatigue'Researchers recruited 365 adults who were considered at elevated risk for Alzheimer's disease. Nearly half (47 per cent) carried the APOE4 gene, the strongest known genetic risk factor for late-onset Alzheimer's.Participants were randomly assigned to receive either a daily omega-3 supplement or a placebo. The supplement contained 2,000 mg of docosahexaenoic acid (DHA), an omega-3 fatty acid essential for brain function.The researchers first examined whether DHA from the supplements could reach the brain. By measuring DHA levels in cerebrospinal fluid — the liquid surrounding the brain and spinal cord — they found a 17 per cent increase after six months, confirming that the nutrient successfully reached its target.The team then assessed memory and cognitive performance at the beginning of the study and again two years later.Despite higher DHA levels in the brain, participants who received the supplements performed no better on memory and cognitive tests than those taking the placebo. Brain scans also revealed no difference in shrinkage of the hippocampus, a memory-related brain region that commonly deteriorates with aging and Alzheimer's disease.What Works Instead? A Healthy LifestyleThe researchers emphasized that maintaining overall health remains the most effective strategy for preserving brain function and reducing Alzheimer's risk."Staying healthy throughout life remains the most powerful tool we have for reducing Alzheimer's risk, including regular exercise, quality sleep, and a balanced diet," said Yassine.He compared brain health to maintaining a vehicle."Living a healthy lifestyle is the brain's equivalent of getting regular car maintenance and high-quality oil changes. The brain is more likely to lose function if health issues elsewhere in the body go unaddressed, just as an engine eventually fails without proper maintenance."Read More: Sickle Cell Disease: Why India Must Add Curative Treatment to Meet Its 2047 Elimination Goal What's Next?Yassine and his colleagues are now investigating why omega-3 supplements can successfully reach the brain yet fail to produce measurable cognitive benefits.The team is also exploring new therapies that could help the brain make better use of omega-3 fatty acids and potentially preserve cognitive function as people age.