High-dose DHA reaches the brain but fails to protect memory

 

What further research will your competent? doctor initiate to figure out how to successfully prevent cognitive decline? Oh sorry; YOUR DOCTOR PLANS ON DOING NOTHING, RIGHT!

You are finding out now that you don't have a functioning stroke doctor/hospital even after unsuccessfully getting you 100% recovered! THAT IS DOCTOR FAILURE!

High-dose DHA reaches the brain but fails to protect memory

High-dose DHA successfully reached the brains of older adults at increased risk of Alzheimer's disease, but the two-year clinical trial found no improvements in memory or brain structure, challenging assumptions that greater omega-3 delivery alone can slow cognitive decline.

A clinical trial published in eBioMedicine found that high-dose docosahexaenoic acid (DHA) supplementation successfully increased brain DHA levels in older adults at risk of dementia, including those carrying the APOE ε4 Alzheimer's risk variant. However, despite reaching the brain, the supplement did not improve cognitive performance or brain structure over two years, raising new questions about how DHA is used within the brain.

Why APOE ε4 alters brain DHA metabolism

DHA is a fatty acid that is part of the nerve cell membrane, playing a key role in synaptic function and modulating neuroinflammation. Its levels tend to be lower in the presence of dementia-linked changes like amyloid deposition and cognitive decline, and in patients with late-onset Alzheimer's disease (AD).

The APOE ε4 gene variant is the strongest genetic risk factor for AD. Previous research suggests it is associated with accelerated DHA catabolism and lower plasma and cerebrospinal fluid DHA levels in people with AD dementia compared with non-carriers.

Observational studies have suggested modest associations between higher omega-3 intake and lower risk of cognitive decline, but randomized trials have produced inconsistent results. Of 24 randomized trials in people without dementia, only five reported positive cognitive effects following DHA supplementation. Conversely, no improvement was seen in patients with AD.

Thus, two important questions remain unanswered: is early intervention necessary in patients with low omega-3 levels before dementia sets in, and are higher doses required to ensure adequate brain uptake? Previous imaging studies suggest that younger cognitively healthy carriers have increased brain DHA incorporation, which may reflect greater DHA demand, compared to non-carriers. This has not been studied in older adults prior to the onset of dementia.

In the current study, researchers investigated whether high-dose DHA supplementation could effectively raise brain DHA levels and potentially support cognitive and structural brain health in older adults with low dietary omega-3 intake before dementia develops.

Testing high-dose DHA before dementia develops 

The investigators conducted a randomized, double-blind, placebo-controlled trial that enrolled 365 adults without dementia, aged 55–80 years, with low DHA intake and at least one dementia risk factor at baseline. Participants received either 2 g/day of DHA or a placebo for 24 months.

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The mean participant age was 66 years, with 58% being female. Approximately 47% of the participants were APOE ε4 carriers, and 39% were Hispanic.

The participants were first classified by willingness to undergo a lumbar puncture (LP) to obtain cerebrospinal fluid (CSF) for analysis. The two groups were assessed for the CSF DHA: arachidonic acid (AA) ratio after six months, which reflects the extent to which DHA is delivered to the brain. Various brain volumes were also assessed.

Increased DHA delivery

The 365 participants were divided into two arms: 181 in the LP arm and 184 in the non-LP arm. In both arms, DHA supplementation significantly increased the CSF DHA/AA ratio at six months compared with placebo, indicating successful delivery of DHA to the brain. There was also a 17% increase in CSF DHA. The red cell omega-3 index also increased from 4.9% to 11%.

The increases in DHA delivery to the brain and in the red cells were independent of APOE ε4 status. This suggests that the gene variant did not influence this process.

However, APOE ε4 non-carriers showed greater improvement in cognitive scores than carriers, with a mean improvement of 3.8 and 1.6 in the two groups, respectively, regardless of treatment group. Importantly, the study demonstrates that inadequate brain delivery is unlikely to explain the disappointing results of previous DHA supplementation trials, because high-dose supplementation successfully increased CNS DHA levels.

The authors hypothesize that simply improving DHA delivery to the brain may not be sufficient to enhance cognitive function, given the enzymatic catabolism of DHA within synaptic membranes, which are crucial for cognitive processing.

There was no difference in brain volumes or in cognitive performance over the whole study period between the intervention and control groups. Adverse events were comparable between groups, and the treatment was generally safe and well-tolerated.

Strengths and limitations

The sample included White and Hispanic participants with a high proportion of APOE ε4 carriers. The low baseline omega-3 intake, CSF DHA measurement, and multiple outcome assessments, coupled with a stringent trial design, were among the study’s strengths.

However, it had several limitations. The participants were relatively young, well-educated, and at an early stage of disease, which might have limited their ability to detect treatment effects over just 24 months.

The study showed a relatively high dropout rate at 38%. Most of this was related to the coronavirus disease 2019 (COVID-19) pandemic. The consequent reduction in sample size might have affected its ability to detect smaller effects on cognitive function or brain structure. Those who dropped out of the study were more likely to be Hispanic, to have lower education levels and baseline cognitive scores, and to have lower plasma DHA concentrations than those who completed the study, which might have affected the generalizability of the findings.

The study used a single supplement, but the authors point out that this could be insufficient in the face of multiple disease processes affecting neuronal health and DHA metabolism in the brain. This is even more true when the participants have vascular risk factors like hypertension and physical inactivity, all of which need to be addressed simultaneously.

The current study included only cognitively healthy individuals, but future studies may benefit from testing supplementation in individuals who already have biochemical signs of early neurodegeneration, such as elevated biomarkers (phosphorylated tau in blood, advanced imaging markers) or more granular neuropsychological testing to detect small changes in executive function. This would improve the detection of treatment changes. A longer follow-up may also be necessary.

Conclusion

The findings show that high-dose DHA supplementation can substantially increase brain DHA levels within six months in older adults at risk of dementia, regardless of APOE ε4 status. Conversely, this did not translate into observable improvements in cognition or brain structure over 24 months.

These results suggest that high DHA intake alone may not be sufficient to improve cognitive outcomes or preserve brain structure in relatively healthy older adults over a 2-year period, despite adequate brain delivery. They also imply that APOE ε4 carriers experience normal DHA delivery to the brain before dementia, despite the dysregulation in established dementia reported in prior research.

Future research should focus on examining DHA metabolism in the brain rather than on additional supplementation trials. Because brain DHA delivery was successfully achieved without improving cognition, future work should focus on how DHA is processed and used within brain cells rather than simply increasing DHA intake.

Download your PDF copy by clicking here.

Journal reference:

• Yassine, H. N., Pour, S. G., Juarez, M., et al. (2026). CNS target engagement of high-dose DHA supplementation in older adults at risk for dementia: a randomised, double-blind, placebo-controlled trial. eBioMedicine. DOI: https://doi.org/10.1016/j.ebiom.2026.106316. https://www.thelancet.com/journals/EBIOM/article/PIIS2352-3964(26)00198-2/fulltext

Fish Oil-Derived DHA Reaches Brain but Does Not Prevent Cognitive Decline: Study Finds

 What further research will your competent? doctor initiate to figure out how to successfully prevent cognitive decline? Oh sorry; YOUR DOCTOR PLANS ON DOING NOTHING, RIGHT!

You are finding out now that you don't have a functioning stroke doctor even are unsuccessfully getting you 100% recovered! THAT IS DOCTOR FAILURE!

Fish Oil-Derived DHA Reaches Brain but Does Not Prevent Cognitive Decline: Study Finds

7 Best Brain-Boosting Superfoods to Eat for Neuroplasticity After Stroke to Optimize Recovery by Flint Rehab

 These should all be in your diet protocol if your doctor and dietician ARE ANY GOOD AT ALL! Oh sorry, not good, you have NO diet protocol, do you?

Let's check how long incompetence has existed for each one!

• blueberries (22 posts to January 2013)
• fish (21 posts to October 2012)
• fish oil (92 posts to June 2012)
• omega-3 (113 posts to June2012)
• leafy green vegetables (6 posts to November 2017)

• walnuts(16 posts to October 2014)
• avocados (12 posts to January 2015)
• tumeric(30 posts to March 2011)

• curcumin (25 posts  to March 2011)
• dark chocolate (23 posts to March 2014)

7 Best Brain-Boosting Superfoods to Eat for Neuroplasticity After Stroke to Optimize Recovery

7 Best Brain-Boosting Foods to Eat After Stroke

1. Blueberries

2. Fatty Fish

.

3. Leafy Green Vegetables

4. Walnuts

5. Avocados

6. Turmeric

.

7. Dark Chocolate

Full details at link.

Fish oil may be hurting your brain, new study finds

 Godawful click-bait headline! Ask your competent? doctor if stroke is not comparable to the events descried here. 

Fish oil may be hurting your brain, new study finds

Date:

April 26, 2026

Source:

Medical University of South Carolina

Summary:

Fish oil has long been praised as brain-boosting, but new research suggests the story may be more complicated. Scientists found that in people with repeated mild head injuries, a key omega-3 fatty acid in fish oil—EPA—may actually interfere with the brain’s ability to repair itself. Instead of helping recovery, it appears to weaken blood vessel stability, disrupt healing signals, and even contribute to harmful protein buildup linked to cognitive decline.

A new study from the Medical University of South Carolina is raising fresh concerns about fish oil supplements, especially for people who experience repeated mild traumatic brain injuries. Writing in the journal Cell Reports, researchers report that these widely used supplements, often promoted as protective for the brain, could actually interfere with healing after injury.

The research was led by neuroscientist Onder Albayram, Ph.D., an associate professor at MUSC and a member of the National Trauma Society Committee. His team focused on the biological processes involved in repairing blood vessels in the brain after injury.

Rising Popularity of Omega-3 Supplements

Interest in omega-3 fatty acids, the key components of fish oil, has been growing rapidly. According to Fortune Business Insights, these supplements are now appearing not only in capsules but also in drinks, dairy alternatives, and snack products.

That surge in popularity does not surprise Albayram. "Fish oil supplements are everywhere, and people take them for a range of reasons, often without a clear understanding of their long-term effects," he said.

"But in terms of neuroscience, we still don't know whether the brain has resilience or resistance to this supplement. That's why ours is the first such study in the field."

Albayram collaborated with Eda Karakaya, Ph.D., Adviye Ergul, M.D., Ph.D., and several other researchers at MUSC and partner institutions. Among them was Semir Beyaz, Ph.D., at the Cold Spring Harbor Laboratory Cancer Center in New York.

EPA Identified as a Potential Weak Point in Brain Recovery

The team discovered what they describe as a context-dependent metabolic vulnerability. In simple terms, this means that changes in how cells use energy may reduce the brain's ability to recover under certain conditions. This vulnerability appears to be linked to the buildup of eicosapentaenoic acid, or EPA, one of the main omega-3 fatty acids found in fish oil.

In their experimental models, higher levels of EPA in the brain were associated with weaker repair after injury.

Albayram noted that not all omega-3s behave the same way. Docosahexaenoic acid, or DHA, is well known for its beneficial role in the brain and is a major part of neuronal membranes. EPA, however, follows a different pathway. It is less incorporated into brain structures, and its effects can vary depending on how long it is present and the surrounding biological conditions. Because of this, the long-term impact of omega-3 intake on brain recovery and blood vessel adaptation has remained unclear.

Experiments Link Diet, Brain Biology, and Recovery

To better understand these effects, the researchers used a series of models to connect diet, brain function, and healing. In mice, they examined how long-term fish oil use influenced the brain's response to repeated mild head impacts. Their focus was on signals related to blood vessel stability and repair.

They also studied human brain microvascular endothelial cells, which form part of the barrier between the brain and the bloodstream. In these cells, EPA, but not DHA, was linked to reduced repair capacity, aligning with the findings from the animal models.

To extend the findings to real-world disease, the team analyzed postmortem brain tissue from individuals diagnosed with chronic traumatic encephalopathy (CTE) who had a history of repeated brain injury.

The researchers described the results as having "implications for precision nutrition, therapeutic strategies and the design of dietary interventions targeting brain injury and neurodegeneration."

Key Findings From the Study

The study identified several major patterns, which are summarized below along with simplified explanations.

EPA-driven neurovascular instability triggers perivascular tauopathy and cognitive decline following TBI.

"In a sensitive brain state modeled in mice, long-term fish oil supplementation revealed a delayed vulnerability. The animals showed poorer neurological and spatial learning performance over time, together with clear evidence of vascular-associated tau accumulation in the cortex, linking impaired recovery to neurovascular dysfunction and perivascular tau pathology," Albayram said.

EPA reprograms cortical transcriptional responses and suppresses angiogenic signaling following traumatic brain injury.

"In the injured cortex, the team observed a coordinated shift in gene programs that normally support vascular stability and repair," Albayram said. "The pattern included reduced expression of genes tied to extracellular matrix organization and endothelial integrity, alongside broader changes consistent with altered lipid handling after injury."

EPA utilization under permissive metabolic conditions impairs angiogenesis and endothelial integrity, recapitulating post-traumatic brain injury cerebrovascular dysfunction.

Albayram said that in human brain microvascular endothelial cells, EPA did not act as a universal toxin. "Instead, when cells were placed in conditions that encouraged fatty acid engagement, EPA was associated with weaker angiogenic network formation and reduced endothelial barrier integrity, matching key features of the neurovascular repair deficit seen in vivo."

CTE brain reveals neurovascular and fatty acid metabolic reprogramming consistent with EPA-linked vulnerability.

"In postmortem cortex from neuropathologically confirmed CTE cases with a history of repetitive brain injury, the researchers found evidence of disrupted fatty acid balance and broad transcriptional changes affecting vascular and metabolic pathways," Albayram said. "This human arm was used to provide translational context, asking whether chronic disease tissue shows convergent signatures of altered lipid handling and reduced vascular stability."

What the Findings Mean for Fish Oil Use

Albayram stressed that the study should not be interpreted as a blanket warning against fish oil. "I am not saying fish oil is good or bad in some universal way," he said. "What our data highlight is that biology is context-dependent. We need to understand how these supplements behave in the body over time, rather than assuming the same effect applies to everyone."

The researchers hope their work encourages a more careful look at omega-3 supplementation, both in clinical settings and among the general public. Their experiments focused on a specific scenario, repeated mild brain injury, and used CTE tissue to provide supporting observations rather than direct proof of cause and effect.

"As with any study, there are important boundaries," Albayram said. "In the human CTE tissue, we can observe patterns, but we cannot prove what drove them. We also cannot capture every variable that shapes omega-3 handling in real life, including overall diet, health status and lifestyle."

Next Steps in Understanding Omega-3 Effects

The team plans to continue investigating how EPA moves through the body, including how it is absorbed, transported, and distributed. They are especially interested in the mechanisms that control fatty acid movement.

"This paper is a starting point," Albayram said, "but it is an important one. It opens a new conversation about precision nutrition in neuroscience, and it gives the field a framework to ask better, more testable questions."

A new study from the Medical University of South Carolina is raising fresh concerns about fish oil supplements, especially for people who experience repeated mild traumatic brain injuries. Writing in the journal Cell Reports, researchers report that these widely used supplements, often promoted as protective for the brain, could actually interfere with healing after injury.

The research was led by neuroscientist Onder Albayram, Ph.D., an associate professor at MUSC and a member of the National Trauma Society Committee. His team focused on the biological processes involved in repairing blood vessels in the brain after injury.

Rising Popularity of Omega-3 Supplements

Interest in omega-3 fatty acids, the key components of fish oil, has been growing rapidly. According to Fortune Business Insights, these supplements are now appearing not only in capsules but also in drinks, dairy alternatives, and snack products.

That surge in popularity does not surprise Albayram. "Fish oil supplements are everywhere, and people take them for a range of reasons, often without a clear understanding of their long-term effects," he said.

"But in terms of neuroscience, we still don't know whether the brain has resilience or resistance to this supplement. That's why ours is the first such study in the field."

Albayram collaborated with Eda Karakaya, Ph.D., Adviye Ergul, M.D., Ph.D., and several other researchers at MUSC and partner institutions. Among them was Semir Beyaz, Ph.D., at the Cold Spring Harbor Laboratory Cancer Center in New York.

EPA Identified as a Potential Weak Point in Brain Recovery

The team discovered what they describe as a context-dependent metabolic vulnerability. In simple terms, this means that changes in how cells use energy may reduce the brain's ability to recover under certain conditions. This vulnerability appears to be linked to the buildup of eicosapentaenoic acid, or EPA, one of the main omega-3 fatty acids found in fish oil.

In their experimental models, higher levels of EPA in the brain were associated with weaker repair after injury.

Albayram noted that not all omega-3s behave the same way. Docosahexaenoic acid, or DHA, is well known for its beneficial role in the brain and is a major part of neuronal membranes. EPA, however, follows a different pathway. It is less incorporated into brain structures, and its effects can vary depending on how long it is present and the surrounding biological conditions. Because of this, the long-term impact of omega-3 intake on brain recovery and blood vessel adaptation has remained unclear.

Experiments Link Diet, Brain Biology, and Recovery

To better understand these effects, the researchers used a series of models to connect diet, brain function, and healing. In mice, they examined how long-term fish oil use influenced the brain's response to repeated mild head impacts. Their focus was on signals related to blood vessel stability and repair.

They also studied human brain microvascular endothelial cells, which form part of the barrier between the brain and the bloodstream. In these cells, EPA, but not DHA, was linked to reduced repair capacity, aligning with the findings from the animal models.

To extend the findings to real-world disease, the team analyzed postmortem brain tissue from individuals diagnosed with chronic traumatic encephalopathy (CTE) who had a history of repeated brain injury.

The researchers described the results as having "implications for precision nutrition, therapeutic strategies and the design of dietary interventions targeting brain injury and neurodegeneration."

Key Findings From the Study

The study identified several major patterns, which are summarized below along with simplified explanations.

EPA-driven neurovascular instability triggers perivascular tauopathy and cognitive decline following TBI.

"In a sensitive brain state modeled in mice, long-term fish oil supplementation revealed a delayed vulnerability. The animals showed poorer neurological and spatial learning performance over time, together with clear evidence of vascular-associated tau accumulation in the cortex, linking impaired recovery to neurovascular dysfunction and perivascular tau pathology," Albayram said.

EPA reprograms cortical transcriptional responses and suppresses angiogenic signaling following traumatic brain injury.

"In the injured cortex, the team observed a coordinated shift in gene programs that normally support vascular stability and repair," Albayram said. "The pattern included reduced expression of genes tied to extracellular matrix organization and endothelial integrity, alongside broader changes consistent with altered lipid handling after injury."

EPA utilization under permissive metabolic conditions impairs angiogenesis and endothelial integrity, recapitulating post-traumatic brain injury cerebrovascular dysfunction.

Albayram said that in human brain microvascular endothelial cells, EPA did not act as a universal toxin. "Instead, when cells were placed in conditions that encouraged fatty acid engagement, EPA was associated with weaker angiogenic network formation and reduced endothelial barrier integrity, matching key features of the neurovascular repair deficit seen in vivo."

CTE brain reveals neurovascular and fatty acid metabolic reprogramming consistent with EPA-linked vulnerability.

"In postmortem cortex from neuropathologically confirmed CTE cases with a history of repetitive brain injury, the researchers found evidence of disrupted fatty acid balance and broad transcriptional changes affecting vascular and metabolic pathways," Albayram said. "This human arm was used to provide translational context, asking whether chronic disease tissue shows convergent signatures of altered lipid handling and reduced vascular stability."

What the Findings Mean for Fish Oil Use

Albayram stressed that the study should not be interpreted as a blanket warning against fish oil. "I am not saying fish oil is good or bad in some universal way," he said. "What our data highlight is that biology is context-dependent. We need to understand how these supplements behave in the body over time, rather than assuming the same effect applies to everyone."

The researchers hope their work encourages a more careful look at omega-3 supplementation, both in clinical settings and among the general public. Their experiments focused on a specific scenario, repeated mild brain injury, and used CTE tissue to provide supporting observations rather than direct proof of cause and effect.

"As with any study, there are important boundaries," Albayram said. "In the human CTE tissue, we can observe patterns, but we cannot prove what drove them. We also cannot capture every variable that shapes omega-3 handling in real life, including overall diet, health status and lifestyle."

Next Steps in Understanding Omega-3 Effects

The team plans to continue investigating how EPA moves through the body, including how it is absorbed, transported, and distributed. They are especially interested in the mechanisms that control fatty acid movement.

"This paper is a starting point," Albayram said, "but it is an important one. It opens a new conversation about precision nutrition in neuroscience, and it gives the field a framework to ask better, more testable questions."

Materials provided by Medical University of South Carolina. Note: Content may be edited for style and length.

Journal Reference:

Eda Karakaya, Burak Berber, Onur Eskiocak, Jazlyn Edwards, Randy Bent Barker, Sarah Jamil, Weiguo Li, Yasir Abdul, Maria Ericsson, Thor Stein, Ann McKee, Adviye Ergul, Semir Beyaz, Onder Albayram. Eicosapentaenoic acid reprograms cerebrovascular metabolism and impairs repair after brain injury, with relevance to chronic traumatic encephalopathy. Cell Reports, 2026; 117135 DOI: 10.1016/j.celrep.2026.117135

Materials provided by Medical University of South Carolina. Note: Content may be edited for style and length.

Sardines vs. Fish Oil Supplements: Which Is Better for Your Heart?

 Ask your competent? doctor which is better for your brain. Your doctor better know the answer. 

Sardines vs. Fish Oil Supplements: Which Is Better for Your Heart?

By Stephanie Brown Medically reviewed by Patricia Mikula, PharmD

Fish oil supplements have not been shown to protect your heart.

Photo Illustration by Amelia Manley for Verywell Health / Getty Images

Key Takeaways

• Sardines are a good and cheap source of heart-healthy omega-3s and other nutrients.  
• Fish oil supplements may not help your heart and could increase the risk of irregular heart rhythms. 

Research shows that sardines are an inexpensive source of omega-3s and other heart-healthy nutrients like calcium, potassium, and magnesium. This type of fish might even make a better alternative to fish oil supplements.1

Can Fish Oil Supplements Protect Your Heart?

While fish oil supplements are popular among U.S. consumers, there’s not much evidence to show that these supplements benefit heart health, said Deepak L. Bhatt, MD, MPH, director of Mount Sinai Heart in New York.

“In fact, it’s quite the opposite. There is data from large trials showing that they don’t provide any cardiovascular benefit,” Bhatt told Verywell.

If anything, he added, fish oil supplements have been shown to increase the risk of developing atrial fibrillation—the most common type of irregular heart rhythm.2

Bhatt said that omega-3 fats are typically better consumed as part of a healthy diet, rather than “isolating one component and taking it at a large dose” with a supplement.

Should You Start Eating More Sardines?

Sardines and other types of fatty fish are heart-healthy if they’re consumed along with a dietary pattern that’s also rich in fruits, vegetables, and whole grains, according to Maya Vadiveloo, PhD, RD, an associate professor of nutrition and food sciences at the University of Rhode Island.

“Regular consumption of fish and seafood, which sardines would fall into, aligns with a heart-healthy diet,” Vadiveloo told Verywell. “When people are consuming more fish, ideally they’re replacing less healthy sources of protein, like red meat, with that fish.”

Sardines could also be a more accessible and affordable alternative to salmon, especially since canned sardines are readily available and have a long shelf life.

Related Stories

The Best Time to Eat Fish to Maximize Omega-3 Benefits

Fresh vs. Dried Dates: Which Is Better for Fiber and Nutrients?

What to Look for When You Buy Sardines

However, you might need to pay attention to what other ingredients are added to the canned sardines, which are sometimes packed in olive oil, water, or tomato sauce and might be high in sodium, according to Emma Laing, PhD, RDN, a spokesperson for the Academy of Nutrition and Dietetics based in Athens, Georgia.

“Individuals who must monitor their sodium intake for health, such as those who have high blood pressure, should be mindful of the ingredient labels,” Laing told Verywell in an email.

You should also avoid canned sardines that have a damaged, rusted, or swollen container, she added.

Are There Any Health Risks to Sardines?

Sardines may be a nutrient-dense fish, but they’re also increasingly contaminated with microplastics3 and heavy metals like arsenic.

Laing also cautioned that sardines contain purines, which may cause a buildup of uric acid and worsen symptoms like joint pain and swelling for people with gout.

Even if you don’t eat seafood, she added, you should still be able to get enough omega-3s from other dietary sources without needing to take a supplement.

For example, walnuts, flaxseeds, chia seeds, and certain fortified foods are also rich sources of omega-3s.4

Read More:

 

4 Sources

By Stephanie Brown
Brown is a nutrition writer who received her Didactic Program in Dietetics certification from the University of Tennessee at Knoxville. Previously, she worked as a nutrition educator and culinary instructor in New York City.