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The 6 Most Important Uses of Omega-3s For Your Health

Why This Was Updated?

Our specialists regularly review advancements in health and wellness, ensuring our articles are updated with the newest information as it becomes accessible.
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Dietary fats have been a hot topic in nutrition, often confusing individuals with conflicting information about what they should or should not consume as part of a healthy diet. The landscape of nutritional advice has evolved over the years, with scientific research shedding light on the complexities of fats and their impact on health. Unsaturated fats, especially omega-3 fatty acids, have emerged as nutritional superheroes, demonstrating many cardiovascular, neurological, and musculoskeletal health benefits.

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What Are Omega-3 Fatty Acids?

Fatty acids are essential components of lipids, which are biological molecules that include fats, oils, and phospholipids. They consist of a long hydrocarbon chain with a carboxyl group at one end. Fatty acids can be classified into different types based on their structure and saturation level. (3)Β 

Saturated fatty acids have no double bonds between carbon atoms in the hydrocarbon chain, meaning they are saturated with hydrogen atoms. Unsaturated fatty acids, on the other hand, have one or more double bonds in the hydrocarbon chain. Monounsaturated fatty acids have one double bond, while polyunsaturated fatty acids (PUFAs) have multiple double bonds. (39)Β 

Omega-3 and omega-6 fatty acids are subtypes of PUFAs. The numbers 3 and 6 denote the position of the first double bond from the methyl end of the fatty acid chain. The main difference between omega-3 and omega-6 fatty acids lies in the location of the first double bond: omega-3 fatty acids have the first double bond at the third carbon from the methyl end, whereas omega-6 fatty acids have it at the sixth carbon. Both omega-3 and omega-6 fatty acids are important for the body; however, maintaining a balance between them is important for health and preventing disease. (6, 15)Β 

There are several types of omega-3 fatty acids, with the most common ones being alpha-linolenic acid (ALA), eicosapentaenoic acid (EPA), and docosahexaenoic acid (DHA). ALA is an essential fatty acid, meaning that the body cannot synthesize it, and it must be obtained through dietary sources. ALA is primarily found in plant sources like flaxseeds, chia seeds, walnuts, and algae. (15, 28)Β 

The body converts ALA to EPA and DHA; however, this conversion tends to be inefficient, so obtaining EPA and DHA from food and supplements is the most reliable way to ensure adequate omega-3 status in the body. EPA and DHA are primarily found in fatty fish, such as salmon, mackerel, and tuna. (15, 28)

Role of Omega-3 Fatty Acids in Body Functions

Omega-3 fatty acids play a crucial role in the structure and function of cell membranes. Omega-3s help compose the phospholipid bilayer of cell membranes, making the membrane more fluid and flexible. This fluidity is vital for various cellular processes, including cell signaling, the exchange of nutrients and waste products, and the functioning of membrane proteins. (38)Β 

Moreover, omega-3 fatty acids, especially DHA, are highly concentrated in neuronal cell membranes in the brain and retina. In the brain, DHA is essential for neurotransmitter signaling, neuronal membrane stability, and neuroplasticity, which is the brain's ability to form and reorganize synaptic connections in response to learning and experience. DHA is a critical component of photoreceptor cells in the retina, contributing to visual signal transduction. Omega-3 fatty acids are required for fetal brain and eye development during pregnancy. They are transferred from the mother to the fetus, influencing the baby's neural and visual development. (17, 22)

Omega-3s have significant anti-inflammatory and immunomodulating properties, which help in reducing inflammation throughout the body. Chronic inflammation is a driving force behind chronic disease, so omega-3s' ability to mitigate inflammation is important for maintaining overall health and preventing disease.Β 

Top Therapeutic Uses of Omega-3 Fatty Acids

Omega-3 benefits extend far beyond their reputation as 'good fats,' with a growing body of research illuminating their remarkable therapeutic applications across a broad spectrum of health concerns.

1. Omega-3s for Heart Health

Omega-3 fatty acids offer significant benefits for cardiovascular health. Research consistently demonstrates their ability to reduce heart disease risk. The 2010 Dietary Guidelines for Americans recommends that adults eat at least eight ounces of seafood weekly to prevent heart disease.

One of the key advantages of omega-3s is their ability to lower triglyceride levels by up to 30%. Studies also suggest that they can improve cholesterol profiles by optimizing high-density lipoprotein (HDL or "good" cholesterol) composition. Additionally, omega-3 fatty acids have been found to lower blood pressure, improving overall vascular function and reducing strain on the heart. These fatty acids also play a role in preventing the formation of blood clots by stabilizing and reversing atherosclerotic plaque buildup in blood vessels.Β 

2. Omega-3s for Mental Health

Omega-3s, especially DHA, are believed to positively impact mental health. Omega 3s' role in brain function enhancement is attributed to their being a major component of neuronal cell membranes and powerful anti-inflammatory properties. These properties support the transmission of signals between brain cells and reduce neuroinflammation, which is associated with mental health and neurodegenerative disorders. (19, 23)Β 

Studies have linked adequate omega-3 levels and fish consumption to improved cognitive function, lower rates of depression, successful treatment of ADHD symptoms, and delayed onset of Alzheimer's disease.Β 

3. Anti-Inflammatory Properties of Omega-3s

Omega-3 fatty acids reduce inflammation by promoting the production of anti-inflammatory molecules, balancing the production of pro-inflammatory and anti-inflammatory eicosanoids, modulating the activity of inflammatory mediators and cytokines, influencing immune cell function, and inhibiting the activation of pro-inflammatory transcription factors. These mechanisms work together to dampen the inflammatory response in the body, resulting in reductions in inflammatory biomarkers CRP, TNF-alpha, and IL-6. (8)

Given these anti-inflammatory properties, it has been postulated that omega-3 fatty acids may be helpful in autoimmune disease management. Clinical trials assessing the benefits of dietary supplementation of omega-3 acids in autoimmune diseases, including rheumatoid arthritis, inflammatory bowel disease (IBD), psoriasis, lupus, and multiple sclerosis, reveal that fish oil has significant benefits in decreasing disease activity and reducing the need for anti-inflammatory pharmaceutical medications. (37)Β 

4. Omega-3s for Eye Health

DHA plays an important role in the functioning of the eye. Eye tissue DHA insufficiency is associated with alterations in retinal function. Because of this, researchers are actively studying the role of omega-3s in treating and preventing a range of eye-related diseases. Results are promising, showing that omega-3 fatty acids (specifically DHA) enhance eye moisture, reduce dry eye symptoms, and ameliorate visual processing deficits. Although more research is needed, preliminary results suggest that omega-3s protect against age-related vision loss. (35)Β 

5. Omega-3s for Bone and Joint Health

Because omega-3s fight inflammation, their role in managing rheumatoid arthritis has been highly studied; people taking fish oil supplements or eating more fatty fish have less morning stiffness and joint pain and the need for anti-inflammatory drugs to control their symptoms. Preliminary research also suggests that omega-3s may be efficacious in treating osteoarthritis by alleviating low-grade joint inflammation and slowing cartilage breakdown.Β 

In addition to joint health, omega-3s have been linked to improved bone density and strength, reducing the risk of osteoporosis and bone fractures. Studies suggest that these fatty acids enhance the body's ability to absorb calcium, a mineral crucial for bone health. (32)Β 

6. Pregnancy and Omega-3 Fatty Acids

To support fetal neurological development, the adequate intake (AI) for omega-3 fatty acids during pregnancy and lactation is 1.4 and 1.3 grams, respectively, per day. Mothers who meet dietary requirements for DHA by eating at least eight ounces of seafood weekly have better infant health outcomes. For example, children of mothers who ate fish more than twice weekly during pregnancy had better visual motor skills by age three than children of mothers who didn't eat fish. Lower consumption of seafood during pregnancy has also been associated with an increased risk of suboptimal communication skills, verbal IQ, and prosocial behavior in children. (30)Β 

Using Lab Testing to Evaluate Omega-3 Levels

In functional medicine, lab testing to assess omega-3 levels provides objective data about an individual's fatty acid status and helps stratify disease risk. Results allow healthcare providers to tailor precise dietary and supplemental recommendations. Two popular lab tests used in this context are the Omega-3 Index and the fatty acid profile.

The Omega-3 Index measures the percentage of EPA and DHA levels in red blood cell membranes. This index is valuable because it reflects a person's long-term omega-3 intake and can predict their risk for heart disease. A higher Omega-3 Index, generally above 8-11%, is associated with lower total mortality and fewer major adverse cardiovascular events.Β 

A comprehensive fatty acid profile assesses various fatty acids in the blood, providing a detailed analysis of the individual's omega-3 and omega-6 fatty acid ratios. An imbalance between omega-3 and omega-6 fatty acids, often due to a Western diet high in processed foods and vegetable oils, is linked to inflammation and chronic diseases. Evidence suggests that the optimal omega-6 to omega-3 ratio for disease prevention should be in the range of 2-4:1. However, Western dietary patterns favor a ratio closer to 20:1 in favor of omega-6 fatty acids. (31)Β 

Achieving optimal omega-3 levels often involves dietary changes, such as increasing the intake of fatty fish, nuts, and seeds while decreasing foods high in omega-6 fatty acids. Dietary sources of omega-6 fatty acids include sunflower, safflower, soy, sesame, and corn oils (31). Supplementation with high-quality fish oil or algae-based omega-3 supplements may also be recommended, especially if dietary changes are challenging to implement consistently.

Side Effects and Considerations

Some fish can be contaminated with mercury and other chemicals. Eating fatty fish lower in mercury, such as salmon and sardines, is recommended to reduce environmental mercury exposure. (9)Β 

While systematic reviews have not established conclusively, there have been suggestions that fish oil supplements might elevate the risk of bleeding due to their anti-thrombotic effects. Therefore, it is advisable for patients who are on blood-thinning medications or are preparing for surgery to exercise caution when considering the use of fish oil supplements. (29)Β 

Omega-3 supplements are generally well-tolerated, and any side effects are typically mild. Common omega-3 side effects include unpleasant taste, heartburn, nausea, diarrhea, and headache. Long-term consumption of combined EPA and DHA supplements in doses of 5 grams daily appears to be safe without causing complications of bleeding, suppressed immune function, or dysglycemia. (30)Β 

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Summary

The multifaceted benefits of omega-3 fatty acids, ranging from heart health and mental well-being to bone and joint support, underscore their significance in promoting overall health. Understanding one's specific omega-3 levels through lab testing can provide invaluable insights into systemic inflammation and disease risk, guiding personalized dietary and supplementation recommendations. Individuals seeking to optimize their health should consult a knowledgeable functional medicine practitioner, who will consider individual needs and goals to offer tailored advice based on medical history and lab findings.

Dietary fats have been a hot topic in nutrition, often confusing individuals with conflicting information about what they should or should not consume as part of a healthy diet. The landscape of nutritional advice has evolved over the years, with scientific research shedding light on the complexities of fats and their impact on health. Unsaturated fats, especially omega-3 fatty acids, have emerged as nutritional components that may support cardiovascular, neurological, and musculoskeletal health.

[signup]

What Are Omega-3 Fatty Acids?

Fatty acids are essential components of lipids, which are biological molecules that include fats, oils, and phospholipids. They consist of a long hydrocarbon chain with a carboxyl group at one end. Fatty acids can be classified into different types based on their structure and saturation level. (3)Β 

Saturated fatty acids have no double bonds between carbon atoms in the hydrocarbon chain, meaning they are saturated with hydrogen atoms. Unsaturated fatty acids, on the other hand, have one or more double bonds in the hydrocarbon chain. Monounsaturated fatty acids have one double bond, while polyunsaturated fatty acids (PUFAs) have multiple double bonds. (39)Β 

Omega-3 and omega-6 fatty acids are subtypes of PUFAs. The numbers 3 and 6 denote the position of the first double bond from the methyl end of the fatty acid chain. The main difference between omega-3 and omega-6 fatty acids lies in the location of the first double bond: omega-3 fatty acids have the first double bond at the third carbon from the methyl end, whereas omega-6 fatty acids have it at the sixth carbon. Both omega-3 and omega-6 fatty acids are important for the body; however, maintaining a balance between them is important for health. (6, 15)Β 

There are several types of omega-3 fatty acids, with the most common ones being alpha-linolenic acid (ALA), eicosapentaenoic acid (EPA), and docosahexaenoic acid (DHA). ALA is an essential fatty acid, meaning that the body cannot synthesize it, and it must be obtained through dietary sources. ALA is primarily found in plant sources like flaxseeds, chia seeds, walnuts, and algae. (15, 28)Β 

The body converts ALA to EPA and DHA; however, this conversion tends to be inefficient, so obtaining EPA and DHA from food and supplements is the most reliable way to ensure adequate omega-3 status in the body. EPA and DHA are primarily found in fatty fish, such as salmon, mackerel, and tuna. (15, 28)

Role of Omega-3 Fatty Acids in Body Functions

Omega-3 fatty acids play a crucial role in the structure and function of cell membranes. Omega-3s help compose the phospholipid bilayer of cell membranes, making the membrane more fluid and flexible. This fluidity is vital for various cellular processes, including cell signaling, the exchange of nutrients and waste products, and the functioning of membrane proteins. (38)Β 

Moreover, omega-3 fatty acids, especially DHA, are highly concentrated in neuronal cell membranes in the brain and retina. In the brain, DHA is essential for neurotransmitter signaling, neuronal membrane stability, and neuroplasticity, which is the brain's ability to form and reorganize synaptic connections in response to learning and experience. DHA is a critical component of photoreceptor cells in the retina, contributing to visual signal transduction. Omega-3 fatty acids are required for fetal brain and eye development during pregnancy. They are transferred from the mother to the fetus, influencing the baby's neural and visual development. (17, 22)

Omega-3s have significant anti-inflammatory and immunomodulating properties, which may help in managing inflammation throughout the body. Chronic inflammation is a concern for overall health, so omega-3s' potential to support the body's natural inflammatory response is important for maintaining overall health.Β 

Top Uses of Omega-3 Fatty Acids

Omega-3 benefits extend far beyond their reputation as 'good fats,' with a growing body of research illuminating their potential applications across a broad spectrum of health concerns.

1. Omega-3s for Heart Health

Omega-3 fatty acids may offer benefits for cardiovascular health. Research suggests they may help support heart health. The 2010 Dietary Guidelines for Americans recommends that adults eat at least eight ounces of seafood weekly to support heart health.

One of the key advantages of omega-3s is their potential to help maintain healthy triglyceride levels. Studies also suggest that they can support healthy cholesterol profiles by promoting high-density lipoprotein (HDL or "good" cholesterol) composition. Additionally, omega-3 fatty acids have been found to support healthy blood pressure, contributing to overall vascular function. These fatty acids also play a role in supporting the body's natural processes that maintain blood vessel health.Β 

2. Omega-3s for Mental Health

Omega-3s, especially DHA, are believed to positively impact mental health. Omega 3s' role in brain function enhancement is attributed to their being a major component of neuronal cell membranes and supportive properties. These properties may support the transmission of signals between brain cells and help manage neuroinflammation, which is associated with mental health and neurodegenerative concerns. (19, 23)Β 

Studies have linked adequate omega-3 levels and fish consumption to improved cognitive function and may support mood balance. Omega-3s are also being studied for their potential role in supporting attention and cognitive health in various populations.Β 

3. Anti-Inflammatory Properties of Omega-3s

Omega-3 fatty acids may help manage inflammation by promoting the production of molecules that support the body's natural inflammatory response. These mechanisms work together to support a balanced inflammatory response in the body. (8)

Given these properties, it has been suggested that omega-3 fatty acids may be helpful in supporting the management of certain health conditions. Clinical trials assessing the benefits of dietary supplementation of omega-3 acids in various conditions, including rheumatoid arthritis, inflammatory bowel disease (IBD), psoriasis, lupus, and multiple sclerosis, suggest that fish oil may support overall health. (37)Β 

4. Omega-3s for Eye Health

DHA plays an important role in the functioning of the eye. Eye tissue DHA insufficiency is associated with alterations in retinal function. Because of this, researchers are actively studying the role of omega-3s in supporting eye health. Results are promising, showing that omega-3 fatty acids (specifically DHA) may support eye moisture and help manage dry eye symptoms. Although more research is needed, preliminary results suggest that omega-3s may support eye health as we age. (35)Β 

5. Omega-3s for Bone and Joint Health

Because omega-3s may help manage inflammation, their role in supporting joint health has been highly studied; people taking fish oil supplements or eating more fatty fish have reported less morning stiffness and joint discomfort. Preliminary research also suggests that omega-3s may support joint health by helping manage low-grade joint inflammation.Β 

In addition to joint health, omega-3s have been linked to supporting bone density and strength, which may help reduce the risk of bone concerns. Studies suggest that these fatty acids may enhance the body's ability to absorb calcium, a mineral crucial for bone health. (32)Β 

6. Pregnancy and Omega-3 Fatty Acids

To support fetal neurological development, the adequate intake (AI) for omega-3 fatty acids during pregnancy and lactation is 1.4 and 1.3 grams, respectively, per day. Mothers who meet dietary requirements for DHA by eating at least eight ounces of seafood weekly may support better infant health outcomes. For example, children of mothers who ate fish more than twice weekly during pregnancy showed better visual motor skills by age three than children of mothers who didn't eat fish. Lower consumption of seafood during pregnancy has also been associated with an increased risk of suboptimal communication skills, verbal IQ, and prosocial behavior in children. (30)Β 

Using Lab Testing to Evaluate Omega-3 Levels

In functional medicine, lab testing to assess omega-3 levels provides objective data about an individual's fatty acid status and helps stratify disease risk. Results allow healthcare providers to tailor precise dietary and supplemental recommendations. Two popular lab tests used in this context are the Omega-3 Index and the fatty acid profile.

The Omega-3 Index measures the percentage of EPA and DHA levels in red blood cell membranes. This index is valuable because it reflects a person's long-term omega-3 intake and can provide insights into their heart health. A higher Omega-3 Index, generally above 8-11%, is associated with overall health benefits.Β 

A comprehensive fatty acid profile assesses various fatty acids in the blood, providing a detailed analysis of the individual's omega-3 and omega-6 fatty acid ratios. An imbalance between omega-3 and omega-6 fatty acids, often due to a Western diet high in processed foods and vegetable oils, is linked to inflammation and chronic health concerns. Evidence suggests that the optimal omega-6 to omega-3 ratio for health should be in the range of 2-4:1. However, Western dietary patterns favor a ratio closer to 20:1 in favor of omega-6 fatty acids. (31)Β 

Achieving optimal omega-3 levels often involves dietary changes, such as increasing the intake of fatty fish, nuts, and seeds while decreasing foods high in omega-6 fatty acids. Dietary sources of omega-6 fatty acids include sunflower, safflower, soy, sesame, and corn oils (31). Supplementation with high-quality fish oil or algae-based omega-3 supplements may also be considered, especially if dietary changes are challenging to implement consistently.

Side Effects and Considerations

Some fish can be contaminated with mercury and other chemicals. Eating fatty fish lower in mercury, such as salmon and sardines, is recommended to reduce environmental mercury exposure. (9)Β 

While systematic reviews have not established conclusively, there have been suggestions that fish oil supplements might elevate the risk of bleeding due to their anti-thrombotic effects. Therefore, it is advisable for patients who are on blood-thinning medications or are preparing for surgery to exercise caution when considering the use of fish oil supplements. (29)Β 

Omega-3 supplements are generally well-tolerated, and any side effects are typically mild. Common omega-3 side effects include unpleasant taste, heartburn, nausea, diarrhea, and headache. Long-term consumption of combined EPA and DHA supplements in doses of 5 grams daily appears to be safe without causing complications of bleeding, suppressed immune function, or dysglycemia. (30)Β 

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Summary

The multifaceted benefits of omega-3 fatty acids, ranging from heart health and mental well-being to bone and joint support, underscore their significance in promoting overall health. Understanding one's specific omega-3 levels through lab testing can provide invaluable insights into systemic inflammation and health, guiding personalized dietary and supplementation considerations. Individuals seeking to optimize their health should consult a knowledgeable functional medicine practitioner, who will consider individual needs and goals to offer tailored advice based on medical history and lab findings.

The information provided is not intended to be a substitute for professional medical advice. Always consult with your doctor or other qualified healthcare provider before taking any dietary supplement or making any changes to your diet or exercise routine.
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The Journal of Pediatrics
Peer Reviewed Journal
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CDC
Government Authority
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Office of Dietary Supplements
Government Authority
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National Heart Lung and Blood Institute
Government Authority
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National Institutes of Health
Government Authority
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Clinical Infectious Diseases
Peer Reviewed Journal
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Brain
Peer Reviewed Journal
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The Journal of Rheumatology
Peer Reviewed Journal
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Journal of the National Cancer Institute (JNCI)
Peer Reviewed Journal
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Journal of Cardiovascular Magnetic Resonance
Peer Reviewed Journal
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Hepatology
Peer Reviewed Journal
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The American Journal of Clinical Nutrition
Peer Reviewed Journal
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The Journal of Bone and Joint Surgery
Peer Reviewed Journal
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Kidney International
Peer Reviewed Journal
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The Journal of Allergy and Clinical Immunology
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Annals of Surgery
Peer Reviewed Journal
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The Journal of Neurology, Neurosurgery & Psychiatry
Peer Reviewed Journal
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Chest
Peer Reviewed Journal
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Blood
Peer Reviewed Journal
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Gastroenterology
Peer Reviewed Journal
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The American Journal of Respiratory and Critical Care Medicine
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The American Journal of Psychiatry
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Diabetes Care
Peer Reviewed Journal
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The Journal of the American College of Cardiology (JACC)
Peer Reviewed Journal
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The Journal of Clinical Oncology (JCO)
Peer Reviewed Journal
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Journal of Clinical Investigation (JCI)
Peer Reviewed Journal
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Circulation
Peer Reviewed Journal
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JAMA Internal Medicine
Peer Reviewed Journal
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PLOS Medicine
Peer Reviewed Journal
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Annals of Internal Medicine
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Nature Medicine
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The BMJ (British Medical Journal)
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The Lancet
Peer Reviewed Journal
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Journal of the American Medical Association (JAMA)
Peer Reviewed Journal
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Pubmed
Comprehensive biomedical database
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Harvard
Educational/Medical Institution
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Cleveland Clinic
Educational/Medical Institution
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Mayo Clinic
Educational/Medical Institution
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The New England Journal of Medicine (NEJM)
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Johns Hopkins
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