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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https://www.sciencedirect.com/science/article/pii/S2274580726000932
Looking at the results, there seems to be no significant physical changes one way or the other, and the cognitive tests look to me like they have no clinical significance.
I’m not pushing fish oil. I think it is oversold, particularly if taken in capsules rather than from eating fish. But this study seems very underwhelming...
“I give up”
Indeed. I just heard a study where smokers with good Omega-3 levels live longer than non-smokers with low Omega-3 levels.
I was fortunate to never experience severe pain from the duodenal ulcer. I did have some excruciating pain in my esophagus. The acid reducer fixed that. Hopefully you are getting better with acid reducer. It's an unpleasant experience.
My local Safeway has lovely Alaskan Salmon slices in the freezer. Quite reasonably priced. I have salmon for dinner every third night. Pasture raised chicken thighs and organic tofu on other nights. Repeat. Tofu sucks but it has a lot of protein and sautéed with some kind of sauce on it makes it reasonably OK. Organic potatoes and veggies, all steamed to preserve vitamins. Easy.
Yogurt for dessert. But I just read or heard that most yogurt is total krep. Have to go buy the really pricey stuff filled with real probiotics at Natural Grocer. Luckily, they are in the neighborhood. They have excellent prices for things I couldn’t buy in any other store. Even great prices for Pasture-raised chicken and eggs, which most stores carry.
Yikes, that’s a lot of drugs. Never heard if any of them, Prayers that the new one works.
Eat we’ll, sleep well, and stay alive as long as you can. Living is fun
I wish I liked salmon, but I can’t stand the stuff. Cod is my favorite fish, but salmon has 10 times the amount of omega 3. You might try making your own yogurt.
I getGarden of Life Olde World Icelandic Cod Liver Oil at Amazon. Take it now and then. Pricey but reliably safe product. Also eat wild-caaught Alaskan salmon, a natural source. Safeway has it in the freezer. I would not eat any salmon that isn’t from Alaska. Neighbors Darlene and John buy salmon from China. They both recently were diagnosed with cancer. Cause and effect? Maybe.
LMAO. I tried, really I did, but my own yogurt was a total disaster. I’m not a good cook and hate cooking, so that may be why. I’ll just spend a few $$ and buy Nancys at the store. far cheaper than wreckage I’d cause throwing pots and pans around.
Cod is lovely and I just had catfish in New Orleans, which was incredibly good once I scraped all the flour and salt off it. Unfortunately, the catfish in the Safeway freezer here is from CHINA. They probably killed cats to pretend it was fish. Daisy would scratch my eyes out if I brought it into the house.
.................”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.”
It is my “expert “ observation that these researchers have Chop Suey for brains.
Researchers from China.....
Salmon is on my plate 1 or 2 times a week. Usually Texas Roadhouse. A trip to Natural Grocer is 55 miles one-way from the house. Before I retired and gas prices went up substantially, the trip to Idaho Falls happened weekly. Now it's 1 or twice per month.
[[found the adenocarcinoma of the Ampulla of Vater in the presence of high grade dysplasia.]]
Ugggh- that doesn’t sound good-
[[I did have some excruciating pain in my esophagus.]]
Sorry to hear that- Must have been miserable! Sore throats are bad enough, but acid reflux can make it seem like heart attack happening- I used to carry tums when the pain started in throat, would radiate to arm, and I’d start sweating profusely. Every time though the tums would tame the flame- so i knew it wasn’t heart attack, but wow it sure felt like it coulda been-
- The pain in mine was excruciating- I went into convenience store bathroom, was standing at sink, and room began to spin wildly- I grabbed the sink and thought “This is bad”- next thing i knew I was coming to wedged between the toilet and wall (Disgusting filthy floor!) and blood covered me and the walls, in all directions-
I stumbled out of the room and a cop was in a car sitting right in front of the bathroom, and saw me, and rushed out- asked a few questions, ran to bathroom, and turned white- He ran into store and called the health center-
Doc had to give me transfusion- Said i was lucky to be alive considering how much i had lost- Said i likely would never get off PPI’s and told me to take peptol fairly steady-
[[Hopefully you are getting better with acid reducer.]]
Yes, much better, thanks- (Not that i am taking the rights meds for it lol- just told doc today about my boneheaded mistake lol)
Wild Cod Liver Canned From Iceland
supposed to be the foi gras (sp?) of the sea
https://www.amazon.com/Wild-Liver-Canned-Iceland-4-27oz/dp/B08C7WX63H
No thankee.
Forgot to,mention, the duodenal ulcer,recently was due to really boneheaded mistake on my part... i didnt have my glasses on, and i combined what i thought was 2 bottles,of omeprazol... turned out it was flomax, so there i was taking flowmax instead of omeprazol, for who knows how long... that is what i thunk caused the ulcer.
Also forgot to mention that when i had the b,eeding ulcer, i was working at the time, but had gotten sick again and was losing strength and endurance, so i was, like a dummmy, taking aspirin to make it through the day, and herbs and vitimins. One of the herbs was Ginko Biloba... bad bad mistake for someone with bleeding ulcers, but i wasnt aware of that. That mistake nearly cost me my life.
To top that off, i was on prednisone at the time for the illness, at max dose, and i stopped taking it cold turkey. Noone ever told me not to. The headache i got from that was straight from hell.
That was a rough year.
I wont keep buggin ya, but i forgot to include context about my mistskes causing the health problems, so,they are a cautionary tale of sorts to those who might be as scatter-brained as me. Ive since learned to research before just trusting that a drug or herb is. Safe
Lol, it certainly looks like an “aquired taste” food item for sure
From the Study;
"Omega-3 supplementation encompassed several types, such as fish oil, flaxseed oil, and krill oil. For analysis, the exposure time point for omega-3 users was defined as the first follow-up visit after a participant reported initiating supplementation. Visits before and after this time point were classified as the non-exposure and exposure periods, respectively."
I know this is an observational study based on self reporting, but these are not equivalent "Omega 3" oils. Flax seed oil contains ALA and is not fish oil. And there is no control of dosage or omega 3 ratios of ALA, DHA, and EPA content or quality of the sources. Since observational, the participants probably utilized different brands from low end Walmart brands to Nordic Naturals Whole Foods higher end offerings.
In addition there is the issue of how source fish are processed and how it changes the final product. (I am not going to try to explain it...so)
Brave Search and summarizer gives:
Triglyceride (TG) form refers to omega-3 fish oil where EPA and DHA fatty acids are attached to a glycerol backbone, mirroring the natural structure found in whole fish. This form is generally considered more bioavailable than ethyl ester (EE) forms, with studies indicating it can yield up to 30% higher absorption of EPA and DHA into the bloodstream.
There are two primary variations of triglyceride-based supplements:
Natural Triglyceride (TG): This is the unmodified form directly extracted from fish. It typically contains lower concentrations of EPA/DHA (around 30% potency) but requires minimal processing and is often gentler on digestion.
Re-esterified Triglyceride (rTG): This is created by first converting fish oil into ethyl esters for purification and concentration, then reconnecting the fatty acids to a glycerol backbone. rTG offers the higher potency of concentrated oil with the superior absorption of the triglyceride structure.
When selecting a supplement, look for labels specifying "Triglyceride form," "rTG," or "Natural triglycerides" to ensure you are getting the more efficiently absorbed version. Products labeled simply as "ethyl ester" or "EE" are more processed, less bioavailable, and require consumption with dietary fat for optimal uptake."
Its possible that anyone taking the Ethyl Ester form (The cheaper form) is not even absorbing the a minimal dose with any positive effect. (I think that our body has to reconnect the glycerine backbone to the Ethyl Ester before using it) Given this, and making no difference between the the Omega 3 sources, and having no idea of the actual dosages used, I do not think that we should have much confidence in their suggestion that Omega 3s contribute to cognative decline. The opposite might be true and the lack of Omega 3s due to underabsorbtion, or use of an less favorable form of Omega 3s might be associated with the decline.
Hoping you can stay on a steady course now that you have zeroed in on the issue. Getting old isn't a game for the weak.
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