High-Dose DHA Fails to Improve Cognitive Decline in Trial

Can high-dose fish oil help prevent Alzheimer's disease? A recent clinical trial published in eBioMedicine suggests the answer is no—at least for cognitively healthy older adults at increased risk for dementia.Researchers followed 365 adults for two years, comparing 2 grams of the omega-3 docosahexaenoic acid (DHA) with placebo. DHA successfully reached the brain, with cerebrospinal fluid levels increasing by 17 percent.But that brain delivery didn't translate into clinical benefit. Participants taking DHA showed no improvement in memory, overall cognitive function, or hippocampal volume compared with placebo. Results were also the same regardless of APOE epsilon 4 status, a major genetic risk factor for Alzheimer's disease.Safety findings were reassuring, with similar rates of adverse events between groups and few serious side effects.So what’s the takeaway? Simply getting more DHA into the brain may not be enough to prevent cognitive decline. Researchers believe future studies should focus on people with early Alzheimer's disease or mild cognitive impairment, and investigate whether DHA works better when combined with other therapies rather than used alone.This video is based on a recent Medscape Medical News article titled " Does High-Dose Omega-3 Benefit Cognition in Older Adults?" and was created using several editorial tools, including AI, as part of the process. Human editors reviewed this content before publication.