Omega-3, Sardines and Reducing Risk of Diabetes in 2022

Omega-3 fats are important for many reasons. While their brain and cardiovascular benefits are well-established, a lesser known benefit has to do with autoimmune diabetes. According to research1,2 published in December 2020, adults who test positive for glutamic acid decarboxylase (GAD65) antibodies — a marker for Type 1 diabetes3 — can significantly reduce their risk of adult-onset diabetes by eating omega-3 rich fatty fish.


The study looked at data from 11,247 cases of adult-onset diabetes and 14,288 diabetes-free controls that participated in the Epic-InterAct case-cohort study conducted in eight European countries. As explained by the authors:4

“Baseline plasma samples were analyzed for GAD65 antibodies and phospholipid n-3 PUFAs. Adjusted hazard ratios (HRs) for incident diabetes in relation to GAD65 antibody status and tertiles of plasma phospholipid n-3 PUFA or fish intake were estimated using Prentice-weighted Cox regression …

The hazard of diabetes in antibody-positive individuals with low intake of total and fatty fish, respectively, was significantly elevated (HR 2.52 and 2.48) compared with people who were GAD65 antibody negative and had high fish intake, with evidence of additive (AP 0.44 and 0.48) and multiplicative interactions.

Individuals with high GAD65 antibody levels (≥167.5 units/mL) and low total plasma phospholipid n-3 PUFAs had a more than fourfold higher hazard of diabetes …”

Results Support Previous Findings

Some of the researchers from this team first investigated the impact of fish consumption on latent autoimmune diabetes back in 2014.5 At that time, they analyzed data from a much smaller cohort that included 89 cases of latent autoimmune diabetes in adults, 462 Type 2 diabetics and 1,007 diabetes-free controls. A food frequency questionnaire was used to determine fish intake along with omega-3 supplementation and vitamin D intake.

Those who ate one or more servings of fatty fish per week had a 49% reduced risk of latent autoimmune diabetes compared to those who got less than one weekly serving.

Results showed those who ate one or more servings of fatty fish per week had a 49% reduced risk of latent autoimmune diabetes, but not Type 2 diabetes, compared to those who got less than one weekly serving. Similar associations were seen among those who took omega-3 supplements.

The Type of Fish You Choose Matters

While this is good news, it’s important to be careful about your seafood choices. Importantly, not all fish contain omega-3s. Only fatty, cold-water fish do. Examples include wild-caught Alaskan salmon, sardines, anchovies, mackerel and herring.

Farmed fish, especially farmed salmon, is best avoided altogether due to the exaggerated potential for contamination. At first glance, farmed fish may seem like a good idea to help protect wild seafood populations from overfishing, but in reality, the industry is plagued with many of the same problems surrounding land-based concentrated animal feeding operations (CAFOs), including pollution, disease, toxicity and inferior nutritional quality.

Most farmed fish are fed genetically engineered (GE) corn and soy, which are a completely unnatural diet for marine life and are loaded with hazardous omega-6 fats. Others are fed fishmeal, which is known to accumulate industrial chemicals like PCBs and dioxins.

Remember a few important facts: The first is that the omega-6 fats that are fed to these fish are about 90% of the dangerous linoleic acid (LA) that I have recently written about. So, consuming these fish will not correct a high omega 6-to-3 ratio. Additionally, the primary action needed if your ratio is too high is to first lower your LA intake, as I review in detail in my recent article on LA.

According to toxicology researcher Jerome Ruzzin, farmed salmon is one of the most toxic foods on the market — five times more toxic than any other food product tested. Farmed fish waste also promotes algal growth that harms the water’s oxygen content, posing risks to coral reefs and other aquatic life.

From a nutritional perspective, farmed salmon have the drawbacks of containing only half the omega-3 of wild salmon6,7,8 and one-fourth the vitamin D,9 while having more than 5.5 times the amount of omega-6.10,11 Farmed salmon are also routinely exposed to antibiotics and pesticides.

Alaska does not permit aquaculture, so all Alaskan fish are wild caught. They also have some of the cleanest water and some of the best maintained and most sustainable fisheries.

To verify authenticity, look for the state of Alaska’s “Wild Alaska Pure” logo. This is one of the more reliable ones, and it’s a particularly good sign to look for if you’re buying canned Alaskan salmon, which is less expensive than salmon steaks.

In the past, sockeye salmon was another good choice as they weren’t farmed. Unfortunately, this has changed. Land-based sockeye salmon farming is now being done,12 which makes it difficult to know whether the fish is wild or not. For this reason, it may be best to avoid it unless you can verify that it’s wild-caught.

Your Omega-3 Index Is an Excellent Predictor of Mortality

Aside from affecting your risk of autoimmune diabetes, omega-3 fats also play other important roles in health. For example, research13 published in 2018 confirmed omega-3 fats can reduce your risk of cardiovascular disease (CVD), coronary heart disease and all-cause mortality.

Overall, those with an omega-3 index in the highest quintile had a total mortality that was 34% lower than those in the lowest omega-3 quintile, and a 39% lower risk for CVD. The strongest association was found for the omega-3 docosahexaenoic acid (DHA). According to the authors, “The omega-3 index can serve as a marker of overall health in older Americans.”

As detailed in “More Data Support Heart Healthy Benefits of Omega-3s,” more recent research found fish oil consumption lowered the risk of all-cause mortality by 13% and cardiovascular mortality by 16%.

DHA for Your Brain Health

DHA is also crucial for brain health. In my book, “Superfuel,” cowritten with James DiNicolantonio, Pharm.D., we explain how DHA is an essential structural component of your brain, and is found in high levels in your neurons, the cells of your central nervous system.

When your omega-3 intake is inadequate, your nerve cells become stiff and more prone to inflammation as the missing omega-3 fats are substituted with omega-6 instead.

Once your nerve cells become rigid and inflamed, proper neurotransmission from cell to cell and within cells become compromised. Low DHA levels have been linked to memory loss and Alzheimer's disease, and some studies suggest degenerative brain diseases may potentially be reversible with sufficient DHA.14,15

DHA also stimulates the Nrf2 pathway, one of the most important transcription factors that regulates cellular oxidation and reduction, and aids in detoxification.16 Additionally, DHA increases heme oxygenase 117 (a protein produced in response to oxidative stress) and upregulates antioxidant enzymes — all of which are important for brain health.

The omega-3 eicosapentaenoic acid (EPA), meanwhile, appears to be particularly beneficial in the treatment of depression,18 as it helps lower levels of tumor necrosis factor alpha, interleukin 1 beta and prostaglandin E2 — three immune chemicals that tend to be elevated in those with depression.

The Many Health Benefits of Omega-3 Fats

Other health benefits of omega-3 fats include the following:

Reducing inflammation — This in turn can be helpful for those suffering with rheumatoid arthritis by reducing stiffness and pain.19 Women who suffer from menstrual pain may also experience milder pain.20,21

Optimizing muscle building and bone strength — Omega-3 fats help your body build healthy muscle mass, including people suffering from cancer who may experience cachexia.22 Omega-3 fats can also help improve your bone strength by improving the utilization of calcium in your body. This may lead to a reduction in the development of osteoporosis.23

Improving metabolic syndrome24 and insulin resistance.25

Improving mental health and behavior — Demonstrated benefits have been shown for children with attention deficit hyperactivity disorder (ADHD), including reduced aggression, hyperactivity,26 impulsivity,27 oppositional behavior28 and restlessness.29 Omega-3 is associated with lowered risk for other neurological/cognitive dysfunction as well, including: memory loss, brain aging, learning disorders and ADHD,30 autism and dyslexia.31

Protecting your vision — DHA is a major structural element in your eye and brain.32 Low levels of DHA may increase your risk for age related macular degeneration.33

Reducing your risk of kidney disease34 and colon cancer.35

The Importance of Phospholipid-Bound Omega-3

While fish oil is a well-known source of omega-3 fats, it has several drawbacks, the lack of phospholipids being one of them. DHA and EPA are water insoluble and therefore cannot be transported in their free form in your blood. They must be packaged into lipoprotein vehicles such as phospholipids. This is primarily why the bioavailability of krill oil is so much higher than fish oil, because in fish oil, the DHA and EPA are bound to triglycerides.

When you take fish oil, your liver has to attach it to phosphatidylcholine in order for it to be efficiently utilized. Phospholipids are also one of the principal compounds in high-density lipoproteins (HDL), which you want more of, and by allowing your cells to maintain structural integrity, phospholipids help your cells function optimally.

Importantly, your brain cannot readily absorb DHA unless it’s bound to phosphatidylcholine, and while krill oil contains phosphatidylcholine naturally, fish oil does not. As the name implies, phosphatidylcholine is composed partly of choline, the precursor for the vital neurotransmitter acetylcholine, which sends nerve signals to your brain, and choline itself is crucial for brain development, learning and memory.

Research36 by Rhonda Patrick, Ph.D., has highlighted the value of DHA bound to phospholipids, showing this form may actually reduce the risk of Alzheimer’s disease in those with the apolipoprotein E4 (APOE4) gene, which lowers the typical age of onset of this degenerative brain disorder.

Two hallmarks of Alzheimer’s are amyloid beta plaques and tau tangles, both of which impair normal brain functioning. Alzheimer’s patients also have reduced glucose transport into their brains, and this is one of the reasons why plaque and tangles form and accumulate in the first place. According to Patrick,37 DHA encourages your brain’s uptake of glucose by regulating the structure and function of glucose transporters, proteins located at your blood-brain barrier.

While eating DHA-rich fish has been shown to slow the progression of Alzheimer’s in APOE4 carriers, taking fish oil has not demonstrated the same efficacy. According to Patrick, this variation in response appears to be related to the different ways in which the two forms of DHA are metabolized and ultimately transported into your brain.

When the triglyceride form of DHA is metabolized, most of it turns into nonesterified DHA, while the phospholipid form is metabolized primarily into DHA-lysophosphatidylcholine (DHA-lysoPC). While both of these forms can cross the blood-brain barrier to reach your brain, the phospholipid form does so far more efficiently.

According to Patrick, people with APOE4 have a faulty nonesterified DHA transport system, and this may be why they’re at increased risk for Alzheimer’s. The good news is that DHA-lysoPC can bypass the tight junctions, thereby improving DHA transport, and for those with one or two APOE4 variants, taking the phospholipid form of DHA may therefore lower their risk of Alzheimer’s more effectively.

Oxidized Linoleic Acid Drives Many Disease Processes

One of the most hazardous fats in the human diet, in my view, is omega-6 linoleic acid (LA). Processed vegetable oils are primary sources of LA, but animal foods such as chicken and farmed salmon also contain high amounts of it, thanks to the fact that the animals are fed LA-rich grains.

There’s evidence to suggest excessive amounts of LA play a role in most chronic diseases, especially top killers such as heart disease. Evidence implicating excessive consumption of LA as a direct cause of heart disease includes, but is not limited to, the following:38

The amount of LA in adipose tissue and platelets is positively associated with coronary artery disease, and studies39 measuring changes in LA concentrations in adipose tissue in Americans show concentrations increased from 9.1% in 1959 to 21.5% in 2008. This increase also paralleled increases in the prevalence of obesity, diabetes and asthma.

Conversely, the long-chained omega-3s DHA and EPA have been shown to protect against coronary artery disease, which is why maintaining a healthy balance between omega-3 and omega-6 is so important.

Patients with atherosclerosis have higher amounts of LA oxidation products in their plasma, low-density lipoprotein (LDL) and atherosclerotic plaques.

Oxidation of LA begins before any clinical signs of atherosclerosis become apparent.

When the endothelium (the interior lining of your blood vessels) is exposed to LA, LDL transfer across the endothelium is increased and this is an essential step in the atherosclerotic process.

Low LA diets reduce LDL oxidation.

A meta-analysis of randomized controlled trials in humans showed that when saturated fat and trans fat are replaced with omega-6 PUFAs, all-cause mortality, ischemic heart disease mortality and cardiovascular mortality increase.

Oxidation products of LA are found in infarcted tissue.

The LA metabolite 9-HODE is a strong promoter of inflammation, and may be both a marker for and inducer of atherosclerosis.

Do You Know Your Omega-3 Index?

An omega-3 deficiency leaves you vulnerable to several chronic diseases and lifelong challenges. Optimizing your levels is truly a foundational strategy to attaining and maintaining good health. The best way to determine if you're eating enough food with omega-3 is to get an omega-3 index test.

The omega-3 index is a measure of the amount of EPA and DHA in the membranes of your red blood cells (RBCs). Your index is expressed as a percent of your total RBC fatty acids. The omega-3 index has been validated as a stable, long-term marker of your omega-3 status.

An omega-3 index over 8% is associated with the lowest risk of death from heart disease, while an index below 4% places you at the highest risk of heart disease-related mortality.

I firmly believe an omega-3 index test is one of the most important annual health screens that everyone needs. GrassrootsHealth makes testing easy through its D*Action+Omega-3 consumer-sponsored research project.40 You can find the GrassrootsHealth omega-3 index test kit both in my online store and on the GrassrootsHealth website.41

Please remember: If you find that you have a high omega 6-to-3 ratio, your primary action needed is to first lower your LA intake, as I review in detail in my recent article on LA.

Sources and References

Two Sardines a Day May Keep Diabetes at Bay

One simple dietary change that may have a positive impact on your risk for diabetes may be adding sardines to your daily regimen. According to a 2021 study published in Clinical Nutrition,7 eating sardines consistently may have a protective effect against developing Type 2 diabetes.

The researchers enrolled 152 people who had a diagnosis of prediabetes and were at least 65 years old.8 In this study, they defined pre-diabetes as glucose levels between 100 and 124 milligrams per deciliter (mg/dL). The whole group was placed on a nutritional program to help reduce the risk of developing Type 2 diabetes.

They were then randomized into a control group and an intervention group, members of which consumed approximately two cans of sardines in olive oil each week. The participants were given instructions to eat the entire sardine without removing the bones and were given a list of recipes.

At the end of the year-long intervention, the researchers compared the risk of developing diabetes from the beginning of the study and the end of the study. In the control group, 27% were at high risk of developing Type 2 diabetes at the start of the study, which dropped to 22% at the end of one year with nutritional changes.9

However, in the sardine group, 37% were at high risk of developing Type 2 diabetes before the intervention began. At the end of one year, this dropped to 8%. The researchers also found there were other measurable parameters that improved in the group that consumed sardines each week.

These included a reduction in insulin resistance, a rise in HDL cholesterol and an increase in adiponectin, a hormone that accelerates the breakdown of glucose. They also measured a decrease in blood pressure and triglycerides.10

The study's lead researcher believes sardines should be recommended as a food as opposed to separating the nutritional benefits from the fatty fish, which are rich in omega-3 fatty acids, calcium, vitamin D and taurine. She said:11

"Not only are sardines reasonably priced and easy to find, but they are safe and help to prevent the onset of Type 2 diabetes. It is easy to recommend this food during medical check-ups, and it is widely accepted by the population.

As we get older, restrictive diets (in terms of calories for food groups) can help to prevent the onset of diabetes … the results lead us to believe that we could obtain an equally significant preventive effect in the younger population."

Sardines Are High in Omega-3 Fat

Sardines are a fatty fish, high in omega-3 fatty acids. After the data analysis, researchers stated they plan to study how sardines may affect the gut microbiome.12 Eating a diet high in omega-3 fats has demonstrated a protective effect on other health markers as well.

The rise in chronic inflammatory diseases in the past decades is likely associated with the introduction and current ubiquitous use of vegetable oils and processed foods high in omega-6 fatty acids.13 Although omega-3 and omega-6 fatty acids are essential for good health, a correct balance is required to be your healthiest.14

Many people consume far too many omega-6 fatty acids found in everything from french fries to frozen meals and salad dressings. Ideally, you want to maintain a ratio of 4-to-1 of omega-6 and omega-3 fats or less.15 Yet, this can be nearly impossible if you are regularly eating processed foods or restaurant fare.

In my view, one of the most hazardous fats in the human diet is omega-6 linoleic acid (LA). Processed vegetable oils are a primary source of LA, but animal foods such as chicken from concentrated animal feeding operations and farmed salmon also have a high amount thanks to the food they are fed, which is high in LA-rich grains.

As I discuss in "Why You Need More Omega-3," there is evidence to suggest that an excessive amount of LA plays a role in many chronic diseases. Omega-3 fats are found in both plants and marine animals. However, they are different types of omega-3 and they are not interchangeable.16

Plant-based omega-3 fats are found in walnuts, leafy green vegetables, flaxseed and chia seeds.17 They contain short-chain alpha linoleic acid (ALA) and do not have the long chain docosahexaenoic acid (DHA) and eicosapentaenoic acid (EPA) found in marine animal-based omega-3.

Although ALA is a precursor to EPA and DHA, it requires an enzyme to convert. In most people, the conversion rate is exceptionally small, typically less than 1%.18 While the small amount of ALA you may eat is converted into the long-chain omega-3 fats your body requires, the process is highly inefficient and cannot supply nearly as much as consuming marine-based omega-3 fats high in DHA and EPA.

It is also important to carefully select your fish since only cold-water fatty fish have high levels of omega-3. Some examples include wild-caught Alaskan salmon, sardines, anchovies, mackerel and herring. It's best to avoid farmed fish altogether for three reasons: first, because there's an exaggerated potential for contamination;19 second, most farms feed the fish genetically engineered corn and soy;20 and third, the omega-6 fats fed to these fish are about 90% dangerous LA fat.

In other words, consuming these fish does not correct a high omega-6 to omega-3 ratio. In fact it contributes to it, since farmed salmon have only half the omega-3 of wild salmon21,22 and more than 5.5 times the amount of omega-6.23,24

Omega-3 Protects Your Lungs and Mitochondria

In addition to a protective effect against diabetes, omega-3 fatty acids help to protect your lungs and mitochondria. Researchers followed first responders after the September 11, 2001, attack on the Twin Towers in New York25 during which firefighters and paramedics were exposed to 10 million tons of caustic material released as the towers were reduced to rubble.26

Researchers from New York University School of Medicine undertook an analysis to determine if there were indications that some first responders may have had a greater risk than others of respiratory problems that occurred after exposure.

They measured metabolites,27 which are a natural byproduct of the breakdown of fat, protein and carbohydrates, and found there were 30 specific metabolites in first responders who had a lower incidence of obstructive airway disease. They also found those with lower levels of the metabolites had a higher risk of developing pulmonary disease.

One group of metabolites associated with a lower risk of lung injury were lipids.28 The researchers found that EPA in particular acts as a precursor for reducing inflammatory response and immune response to any injury and may have helped reduce the damage in first responders triggered by exposure to toxins.29

Another study in children living in Baltimore City30 also found evidence those who ate more foods with omega-3 had a lower asthmatic response to particulate matter pollution than children with lower levels of omega-3s. Conversely, children with higher levels of omega-6 had a higher percentage of neutrophils in response to pollution, which is a white blood cell marker of inflammation.

Your omega-3 levels may also affect mitochondrial function.31 Some of the more profound effects of mitochondrial disease are evident in the brain and muscle, including the heart. Your mitochondria are important in energy production and calcium signaling, as well as apoptosis and autophagy.

One animal study demonstrated there was a positive effect on mitochondrial function and neuroprotection with the administration of omega-3 fats.32 Another lab study showed omega-3 fat exposure to cells induced metabolic rate, thus increasing mitochondrial content in comparison to control cells.33

One of the signs of advancing age is remodeling of the cell membranes in the heart.34 An impact from this remodeling is mitochondrial function, which plays a role in sustaining energy production. Changes in the mitochondrial membrane are exacerbated by the presence of omega-6, but increasing omega-3 fat can help affect aging and facilitate mitochondrial energy production.

Your Omega-3 Index May Predict Mortality

A deficiency in EPA and DHA can leave you vulnerable to chronic disease. Optimizing your omega-3 levels is a foundational component to good health. However, there is no good way to know your omega-3 level without getting an Omega-3 Index test.

Your target Omega-3 Index is 8%.35 This is the typical level of people living in Japan where you'll find the lowest rate of sudden heart death in the world. The highest risk is in people whose Index is 4% or lower. At this point there is no evidence to suggest the measurement is different for men, women or for different ages.

One study,36 published in January 2021, evaluated 100 individuals' Omega-3 Index and compared them against their COVID-19 outcomes. The primary outcome measurement was death. When the overall data were analyzed, the researchers found only one death in the group with the highest quartile of Omega-3 Index.

The research data also confirmed past results that demonstrated the average person in the U.S. has an Omega-3 Index near 5%,37 which is well below the measurement that has demonstrated protective effects on overall mortality.38 The data from this group showed an average index of 5.09% and a median of 4.75%.39

One study40 published in 2018 confirmed omega-3 fat can reduce your risk of cardiovascular disease, coronary heart disease and all-cause mortality. The researchers measured Omega-3 Index in 2,500 participants and found those in the highest quintile had a total mortality 34% lower than those in the lowest quintile.

Sources and References

This article was brought to you by Dr. Mercola, a New York Times bestselling author. For more helpful articles, please visit Mercola.com today.

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