Omega-3 fatty acids are known for their role in brain and heart health but are they all they're cracked up to be? Should you take fish oil to get your daily dose of omega-3s, or should you opt for plant-based options instead? So many questions! If DHA, EPA, and ALA sound like alphabet soup to you, read on — we'll provide clarity.
To begin, let's look at fatty acids in general. Fatty acids are the building blocks of all fats (lipids). Every fatty acid contains an acid connected to a long chain of carbon and hydrogen molecules.
Fatty acids can be saturated or unsaturated. In other words, the long carbon chain is either saturated or "full of" hydrogens, or not. If all carbons are single-bonded to hydrogens, the chain stretches out straight. These straight chains stack up and stick together, forming a solid material — as happens with animal fat or coconut oil — at room temperature. In contrast, an unsaturated fatty acid has double bonds that cause the chain to "kink" or bend. These kinked up chains do not stack up or stick together like saturated fats do, so they stay in liquid form.
That brings us to omega-3 fatty acids. Omega-3s play a critical role in your body, forming part of every cell's structural membranes. They also help brain cells send messages through neurotransmitters and provide energy within the cardiovascular, immune, and endocrine systems, among other functions.
The "omega" represents the tail end of the fatty acid molecule, and the "3" indicates that the last double bond is three carbons from the chain's end. Omega-3 fatty acids are considered polyunsaturated fats.
Eleven types of omega-3 fatty acids exist, but just three play an important role in human physiology and health: eicosapentaenoic acid (EPA), docosahexaenoic acid (DHA), and alpha-linolenic acid (ALA).[1] Of the three, only ALA is considered an essential fatty acid. This means that your body does not make it and you must get it from food or supplements. Your body can convert ALA to EPA and DHA, making these latter two not "essential" fatty acids, but the conversion process occurs at such a low rate (between 2 and 10 percent) that, for all practical purposes, you need to get EPA and DHA from your diet.[1, 2]
Also, don't confuse alpha-linoleic acid with the other "ALA" which is alpha-lipoic acid, which is not an omega-3 at all. For the purpose of this article, ALA refers to the omega-3.
As the building blocks of fats in the human body, fatty acids play an integral role in energy storage, brain activity and mental health, heart health, and more. Below are the top health benefits that omega-3 fatty acids provide to your body and mind.
Restful sleep is important for memory, focus, and energy levels. Getting adequate DHA, in particular, helps you get better quality sleep — and more of it. Lower blood levels of DHA are linked to poor sleep quality in children. Algae oil DHA supplementation led children to have seven fewer wake episodes and 58 minutes more rest per night.[3] While scientists aren't entirely sure why DHA is so critical to slumber, they hypothesize that lower levels in the brain may interfere with melatonin, a hormone that regulates sleep.[3]
Omega-3 fatty acids play an important role in brain function, including memory and cognition — the process of thinking. The substance that insulates brain cells and helps them communicate with one another, myelin, is made up of omega-3 fatty acids and proteins. When the body lacks omega-3s, myelin sheaths erode, which cause memory to decline.
People with Alzheimer's disease, dementia, multiple sclerosis, and other neurological disorders are often deficient in omega-3 fatty acids.[1, 4] Yet getting enough boosts memory and cognition.[1] While omega-3s are especially helpful in aging individuals, they also improve nonverbal reasoning, logical memory, and working memory in healthy middle-aged adults.[4] Getting enough omega-3s during pregnancy and when breastfeeding — as well as for young children — is essential for proper brain development.
Omega-3 fatty acids help regulate and even improve your mood. Omega-3s may even help certain mood disorders.[5] Omega-3 supplementation can also help reduce the chance that women going through menopause will become depressed,[6] and can reduce symptoms of pre-menstrual syndrome.[7] Omega-3 supplementation may even reduce oppositional behavior, restlessness, aggression, and inattention in children with ADHD.[1]
Omega-3 fatty acids, along with the hormone vitamin D, play a role in the synthesis or creation of serotonin, a neurotransmitter that plays a critical role in having a happy mood.[8] Scientists also theorize that omega-3s promote a positive mood by promoting normal levels of homocysteine and inflammatory cytokines circulating in the blood — the same way they improve heart health.[5]
As mentioned, omega-3s normalize levels of cytokines in the blood, substances that inflame and irritate the body's organs and tissues, leading to poor heart health, among other things.[5] One way that omega-3s help the cardiovascular system is by discouraging too many omega-6 fatty acids, which promote inflammation, from forming.[9, 10]
Omega-3 supplements also reduce triglyceride build-up in the blood, which is linked to an increased risk of heart attack and stroke; this is true even though omega-3 dietary supplements actually contain triglycerides![11] Supplementing with omega-3s can help promote normal cholesterol, triglycerides, and blood pressure.[1]
Both your brain and eyes contain high levels of omega-3 fatty acids. But can taking omega-3s improve eye health and vision? The retina — the part at the back of the eye that allows you to see color and light — has high levels of DHA. Taking DHA can discourage retinal degeneration (also called macular degeneration).[12] Also, omega-3 supplementation during pregnancy may help ensure an infant's eyes develop properly.[12]
Because of their anti-inflammatory properties, omega-3 fatty acids may reduce joint tenderness and discomfort, particularly in cases of rheumatoid arthritis.[1] Omega-3s help so much that they have reduced some patients' need for additional medications.[1]
How can taking a fat supplement help you lose weight? It turns out omega-3 consumption may help reduce appetite and feelings of hunger. Eating a diet rich in omega-3 fatty acids may leave you feeling fuller up to two hours after a meal.[13] These effects may not apply universally though because it may decrease the levels of the "fullness hormone" in some people.[14]
An asthma attack occurs when the lungs, trachea, and airways become inflamed, bringing on a hacking, wheezing cough. Asthma attacks may be triggered by allergens, smoke, stress, or even inhaling cold air. By reducing swelling in the body — particularly in the airways and lungs — omega-3 fatty acids may reduce the risk of asthmatic attack.[15, 16]
Regularly elevated blood sugar is one of the main indicators of diabetes, metabolic syndrome, and other health conditions. When people get metabolic syndrome, they often have high blood sugar, insulin resistance, obesity, high triglycerides, and low good (HDL) cholesterol. Studies show that taking omega-3s improves these symptoms and reduces insulin resistance. In other words, it helps cells take up glucose, preventing too much from circulating in the blood.[17] For other tips, check out our article on natural ways to reduce blood sugar.
Omega-3 fatty acids are present in a variety of natural foods including leafy green vegetables, nuts, seeds, and beans. Many plant sources contain ALA, while you can get DHA from fish oil as well as algae oil. See the table below for a variety of plant-based sources of omega-3s.
| Food | Grams of ALA Per Serving |
|---|---|
| Flaxseed oil, 1 tbsp | 7.26 |
| Chia seeds, 1 ounce | 5.06 |
| English walnuts, 1 ounce | 2.57 |
| Flaxseed, whole, 1 tbsp | 2.35 |
| Black walnuts, 1 ounce | 0.76 |
| Refried beans, canned, vegan, ½ cup | 0.21 |
| Kidney beans, canned ½ cup | 0.10 |
| Baked beans, canned, vegan, ½ cup | 0.07 |
Adding omega-3 fatty acid supplement to your daily regimen of vitamins and minerals is a great idea. While the most popular and common omega-3 supplements are fish oil, krill oil, and cod liver oil, many healthcare providers suggest that you avoid fish sources altogether given the rising levels of mercury and other toxic metals now found in many types of cold water fish.[18] Instead, choose vegan, plant-sourced supplements such as algae, micro-algae oil, or flaxseed oil. Most plant sources contain ALA, only algae or micro-algae oil contain EPA, DHA, and ALA.
Omega-6 fatty acids (which have their final double bond six carbons from the end of the chain) are found in plant sources like walnuts, sunflower seeds, and corn. Omega-6 fatty acids tend to be associated with inflammation. While inflammation is a normal and necessary reaction to infection, when it persists and creates systemic inflammation, health concerns result. Omega-3 fatty acids can counteract the effects of omega-6s by keeping them in balance.
Experts recommend that we get omega-6 and omega-3 fatty acids in a 2:1 ratio, which speeds the body's conversion of ALA to EPA and DHA. However, many people — especially vegetarians — tend to get more omega-6s (in a ratio up to 10:1).[19] Seaweed and algae are the only plant-based sources of EPA and DHA, but you can also eat more plant-based ALA-containing foods or take supplements to optimize this ratio and get it closer to 2:1.
An omega-3 fatty acid deficiency usually appears initially as dermatitis — dry, itchy, scaly skin.[1] An omega-3 deficiency may also cause brain fog, affect cognitive function and the immune system, and reduce energy levels. If you are experiencing memory issues, excessive fatigue, or you keep getting colds and other bugs, you may want to consider supplementing with omega-3s.
Not all fats are created equal, and omega-3 fatty acids shine bright, offering significant health benefits. Three fatty acids affect human physiology: alpha-linolenic acid (ALA), eicosapentaenoic acid (EPA), and docosahexaenoic acid (DHA). ALA is an essential fatty acid, meaning the body does not manufacture it and you must get it from food or supplements.
All three omega-3 fatty acids play a vital role in the brain, cardiovascular, and immune system, so it is important to make sure you get enough at all ages and stages of life. While you can get omega-3 fatty acids from fish oil, and these are often the most popular supplement, fish is often contaminated with mercury and harvested unsustainably from the ocean. Instead, choose plant-based sources for optimal health and nutrition, such as flaxseed oil, algae oil, or other dietary sources like nuts, seeds, and leafy green vegetables.
What is your experience with omega-3 fatty acids? Do they help you? Share your experiences below!
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