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Posted on 05/04/2026 8:35:08 PM PDT by Red Badger
Omega-3 supplements are popular among many older adults to help combat age-related issues. They are often marketed as supporting cardiovascular health and reducing the risk of cognitive decline and dementia. However, a new study published in The Journal of Prevention of Alzheimer's Disease suggests that these oral capsules may actually be linked to a faster decline in cognitive function.
Many senior citizens swear by oral supplements and the benefits they bring. However, the scientific evidence is mixed. While animal and observational studies have indicated possible protective effects on the aging brain, controlled trials with humans have not shown such cognitive benefits.
To try to find definitive answers about whether the supplements actually slow cognitive decline, researchers from China used long-term patient data from the Alzheimer's Disease Neuroimaging Initiative (ADNI) and studied highly detailed brain scans.
The omega-3 paradox
The study examined cognitive and brain imaging changes over five years in 273 omega-3 users and compared them with a control group of 546 non-users. These were matched for age, sex, genetics, and diagnosis.
The results revealed that participants taking omega-3 supplements showed a more rapid decline across the three primary cognitive assessments (MMSE, ADAS-Cog13, and CDR-SB) each person completed during the study.
FDG hypometabolism mediates the association between omega-3 supplementation and cognitive decline. Credit: The Journal of Prevention of Alzheimer's Disease (2026). DOI: 10.1016/j.tjpad.2026.100569 This pattern remained the same regardless of genetics. Both groups had the same number of people with the APOE ε4 gene, which is associated with increased risk for Alzheimer's. This suggests the difference in decline was unlikely to be explained by this major genetic risk factor alone.
To see why this might be the case, the researchers studied brain scans to look for physical changes. The faster decline did not appear to be caused by the typical signs of Alzheimer's, such as the buildup of amyloid plaques or abnormal clumps of tau proteins.
Glucose and the aging brain
Instead, the scans revealed a significant drop in brain glucose metabolism, which the research team believes may be linked to omega-3 supplementation. This reduction is often associated with synaptic dysfunction, meaning that while the physical structure of the brain may remain relatively intact, communication between brain cells may be less efficient.
"Omega-3 supplementation may be associated with accelerated cognitive decline in older adults, potentially through adverse effects on cerebral synaptic function rather than classical AD proteinopathies," wrote the study authors in their paper.
The team points out that their results are not conclusive. This was an observational study, not a clinical trial, that identified an association rather than a definitive cause. Nonetheless, it's a correlation that needs further investigation.
"These findings challenge the prevailing view of omega-3 as uniformly beneficial and highlight the need for a cautious reassessment of its widespread use for cognitive protection."
Written for you by our author Paul Arnold, edited by Gaby Clark, and fact-checked and reviewed by Robert Egan—this article is the result of careful human work. We rely on readers like you to keep independent science journalism alive. If this reporting matters to you, please consider a donation (especially monthly). You'll get an ad-free account as a thank-you.
More information
Zheng-Bin Liao et al, The association between omega-3 supplementation and cognitive decline in older adults, The Journal of Prevention of Alzheimer's Disease (2026). DOI: 10.1016/j.tjpad.2026.100569
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Only one third of people who smoke die of it!
cause or effect? Those suspecting they have problems are more likely to take the supplement, so it’s not a good study.
I was taking 30 mg of Prevacid which worked very well- had ot take for bleeding ulcers which dern near done me in- anyway- insurance quit paying and demanded i be given omeprazol instead- they put me on 20 mg. long story short- just got out of hospital recently for duodenal ulcer that had me doubled over in pain for almost 2 weeks- couldn’t stand it anymore- and went in- they put me on 40 mg, 1 pill twice a day mornin night- so far it ‘seems to be’ working, but we’ll see-
Under doctors direction I’ve been taking omega 3 for 4 years. No cognitive decline noted. It has stuned my beeber however
Yeah, I don’t buy this.
It’s an observational study, for one. Sample bias strikes me as an obvious issue.
Second, what is the composition of the omega3? If not DHA heavy, I have doubts.
Review
Our brains are mostly fat............
absolutely
no pills
Fish fat has a disgusting smell. That’s all you need to know to realize you should avoid it.
Fish liver oil was the only source of vitamin d in some places. That might have confused some and let them to believe that the fat was good.
I also take a load of supplements but I’m not kidding myself that any of it will make me healthier or make me live longer.
- - - - - - -
Foods have enough retinol. If you take it from supplements, it accumulates and causes problems, for example, bone problems.
the best I can do is smoked salmon in cream cheese on bagel chips.
Wash that krill and astaxanthin down with a cup of fresh ground and brewed coffee...mmmmmm, good!
So that’s why my dog licks his balls.
Chinook or Coho.
Question for you, ConservativeMind...
You know a lot about medicine. Do you believe this post?
Would stop taking Omega-3 because of this study?
There were no consequential issues with EPA or DHA until a brain injury occurred. Then, it was found EPA confused the ability of the brain's vascular system to properly heal, leaving cells a bit dysfunctional. DHA was seen as beneficial and truly helping in damage repair. In supplements, we usually get fairly more EPA than DHA. In our bodies, we can convert EPA to DHA, though, but it might be that processes to do that break down a bit, as we age.
Also, we don't pass much DHA or EPA into our brains, yet, our brains really need them. Processes to guide EPA and DHA into the brain can break down. People with the APOE4 gene (about 25% of the population) have this and they specifically do have transport mechanisms that break down early (late 20s).
There are specific ways to get these fats into the brain again. Plasmalogens and lysophosphatidylcholine bound to DHA and EPA get the fats there, through different mechanisms. My wife and I recently started taking these, a few months back. Specifically, they are a supplement with Hokkaido scallop oil plasmalogen and another with Lysoveta brand lysophosphatidylcholine.
We still take a teaspoon of Omega-3 fats on days we don't eat salmon or such, but we are taking the gel caps of the two supplements mentioned above, every day.
If trying to just optimize normal Omega-3 fat, I would favor getting more DHA and just some EPA, if not eating salmon or sardines.
The study examined cognitive and brain imaging changes over five years.
The results revealed, a more rapid decline across the three primary cognitive assessments each person completed during the study.
The team points out that their results are not conclusive. This was an observational study, not a clinical trial.
—
1. What was the source of the supplements? Some supplements are garbage. Others, like Andrew Lessman, are excellent.
2. How are the imaging changes linked to the cognitive test results?
3. No significance tests? Here, the probability of rejecting the null hypothesis (that Omega-3 supplements benefit the brain) is >> 5%.
Conclusions: the methods and results of this study are suspect.
I hope you are getting enough protein. There are supplements such as PreProtein which provide 15 grams of protein in a one ounce dose. Fairlife protein shakes are also lactose-free, and the chocolate variety is delicious.
Good luck to you.
Just wonder what Hokkaido scallops have that others don't have?
This is the only supplement with that in it I could find (Amazon):
It's 50 dollars for 30 gels!
I got them three at one time, using a promotion, and with the Subscribe and Save discount, for $107.
So, around $33 a bottle. We’ve taken these several months.
I will say the Lysoveta is newer and uses a different mechanism to get DHA and EPA into the brain and eyes. I believe both are useful approaches, but the Lysoveta (Accentrate Omega Max) at 1-3 capsules a day will likely be a cheaper way to get Omega-3 fats in the brain. We got this on a promo, but it was ultimately cheaper to get directly from Accentrate on a subscription.
Do note plasmalogens directly get incorporated into neuronal membranes, while The Lysoveta approach seems to get the stuff there for other processes to utilize. It seems likely the brain and eye activity differs between the supplements.
More on the Lysoveta approach, here: https://lysoveta.com/science/explore
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