Omega-3 vs. Omega-6: Do You Really Need Both?
Do you really need both omega-3 and omega-6? Learn how omega-3 supports brain and eye function, how omega-6 helps protect your skin and maintain healthy cholesterol levels, and which foods provide these essential fats without relying on supplements.
Key takeaways
- Omega-3 and omega-6 are two families of fats your body needs to function normally.[1]
- Both support important body functions. Omega-3 plays roles in brain, eye and cardiovascular health, while omega-6 supports skin health, growth and immune function.[3]
- Not all omega-3 foods provide the same fatty acids. Plant foods mainly supply ALA, while fatty fish provides EPA and DHA.[1]
- Omega-6 does not automatically cause inflammation. Clinical studies generally have not found convincing evidence that higher linoleic acid intake increases common inflammatory markers in healthy people.[4]
- You don’t need to eliminate omega-6 to benefit from omega-3. Supplements containing both are not automatically necessary.[2]
In this article
- What Are Omega-3 and Omega-6?
- Omega-3 vs. Omega-6: What Are the Main Differences?
- How Do Omega-3 and Omega-6 Help Your Body?
- Does Omega-6 Cause Inflammation?
- Does the Omega-6-to-Omega-3 Ratio Matter?
- Which Foods Contain Omega-3 and Omega-6?
- What This Means in Practice
- Frequently asked questions
- Final thoughts
You’ve probably heard countless times how important omega-3 is for your health. And you’ve likely seen shelves full of omega-3 supplements at the pharmacy, with capsules, syrups and drops for both children and adults.
Omega-3 seems to be everywhere. There’s advice on when to take it, how often and even what time of day works best. It’s recommended in certain situations during pregnancy and childhood, and who knows? Your veterinarian may have suggested an omega-3 supplement for your dog, too!
But before adding another bottle of omega-3 to your shopping cart, or wondering whether you should buy omega-6 as well, let’s find out what these fats actually are, what they do inside your body and how much you really need them.
What Are Omega-3 and Omega-6?
First, omega-3 and omega-6 aren’t vitamins or names for supplements. They’re two families of healthy fats, known as polyunsaturated fatty acids, that your body uses to maintain cells and carry out important functions.[1]
That distinction matters on a pharmacy shelf, where the nutrient and the product are often confused with each other. Our guide to fish oil vs. omega-3 explains why the two are not the same thing.
Both families include essential fats that your body cannot make on its own. That’s why you need to get them from food, even if you never take a supplement.
Omega-3: What Types Are There, and Where Can You Find Them?
Omega-3 includes three important fatty acids. Although they belong to the same family, they aren’t identical.
- ALA: Found in flaxseeds, chia seeds, walnuts and canola oil. Your body can use it for energy and convert a limited amount into EPA and DHA.
- EPA: Found in fatty fish such as salmon, sardines, herring and mackerel, as well as certain algae. It helps regulate processes involved in inflammation.
- DHA: Found in fatty fish and certain algae. It is especially important for the structure of the brain and retina.
So, two foods that contain omega-3 won’t necessarily provide the same type of fat. To understand these differences better, explore our guide to omega-3 fatty acids, their types and food sources.[1]
Omega-6: What Types Are There, and Where Can You Find Them?
Omega-6 is found in many everyday foods. The main type is linoleic acid (LA), which is present in conventional sunflower oil, soybean oil, nuts and seeds.[3]
Another type is arachidonic acid (AA), found in eggs, meat and fish. Your body can also make it from linoleic acid and use it for immune responses and other normal functions.
This means you don’t need to look for every type of omega-6 separately. What matters is getting enough essential fats through your diet.
Omega-3 vs. Omega-6: What Are the Main Differences?
Both are important for your health, but some of their sources and functions are different.
| What Are We Comparing? | Omega-3 | Omega-6 |
|---|---|---|
| Main food sources | Fatty fish, flaxseeds, chia seeds, walnuts | Vegetable oils, nuts, seeds |
| Important roles | Brain, eyesight, heart health | Skin, growth, immune function |
| Effects on blood fats | EPA and DHA can lower elevated triglycerides | Can help lower LDL cholesterol when replacing saturated fats |
| Essential fatty acid | ALA | Linoleic acid |
These are general differences, not a complete list of their functions. Both families help maintain cell structure and support important processes throughout your body.
How Do Omega-3 and Omega-6 Help Your Body?
What Does Omega-3 Do for Your Body?
Brain and eyesight. DHA is part of the structure of nerve cells and the retina, helping them function normally. It is especially important during early development, although taking DHA supplements doesn’t automatically improve memory or vision.[1]
Heart health. EPA and DHA can lower elevated triglycerides, particularly at doses used for medical treatment. However, their effects on preventing heart attacks and other cardiovascular conditions depend on the product and the person’s health.[1]
Inflammation control. EPA and DHA help your body produce substances involved in controlling and resolving inflammatory responses. This doesn’t mean that every omega-3 supplement can treat inflammatory diseases.
You can learn more about their roles in EPA vs. DHA: Two Omega-3s, Different Roles in Your Body.
What Does Omega-6 Do for Your Body?
Protects your skin. Linoleic acid helps maintain your skin’s natural barrier, which prevents excessive water loss. A deficiency in essential fats can cause dryness and other skin problems.[3]
Supports immunity and healing. Your body uses arachidonic acid to produce substances involved in responding to infections and injuries. These reactions help your body defend itself and repair damaged tissues.
Supports growth and cardiovascular health. Omega-6 is needed for normal development, and replacing some saturated fats with linoleic acid may help lower LDL cholesterol.[2]
Does Omega-6 Cause Inflammation?
This is one of the most common claims about omega-6. It comes from the fact that your body can turn arachidonic acid into substances involved in inflammatory responses.
But inflammation isn’t always a bad thing. It’s also a normal reaction that helps your body respond to infections and begin repairing an injury.
What do human studies show? Clinical research generally hasn’t found convincing evidence that higher linoleic acid intake increases common markers of inflammation in healthy people.[4]
This doesn’t rule out every possible effect under all conditions. However, it shows why it’s misleading to describe all omega-6-rich foods as inflammatory.[5]
Does the Omega-6-to-Omega-3 Ratio Matter?
You may have seen recommendations for a ratio of 4:1, 2:1 or even 1:1. These numbers compare how much omega-6 you consume with how much omega-3 you get, but research hasn’t established one ideal ratio for everyone.[3]
A lower ratio doesn’t automatically mean a healthier diet. For example, if you reduce omega-6 without eating more omega-3, the ratio changes, but your omega-3 intake stays exactly the same.
A more useful approach is to check whether you’re getting enough essential fatty acids from food. You don’t need to give up walnuts or certain vegetable oils just to achieve a smaller number.[2]
Which Foods Contain Omega-3 and Omega-6?
Some foods provide mainly omega-3 or omega-6, while others contain both. Here are a few easy-to-find examples.
| Food | Relevant Fatty Acids |
|---|---|
| Salmon and sardines | Omega-3: EPA and DHA |
| Flaxseeds | Omega-3: ALA |
| Chia seeds | Omega-3: ALA |
| Walnuts | Omega-3 and omega-6 |
| Canola (rapeseed) oil | Omega-3 and omega-6 |
| Conventional sunflower oil | Mainly omega-6 |
| Soybean oil | Omega-6 and omega-3 |
| Pumpkin seeds | Mainly omega-6 |
Fatty acid content may vary depending on the variety and processing method. For example, high-oleic sunflower oil contains less omega-6 than conventional sunflower oil.
If you’re curious about what happens to plant-based omega-3 after you eat it, read ALA Omega-3: What Really Happens After You Eat It?
What This Means in Practice
You don’t need to calculate your omega-3-to-omega-6 ratio every day or eliminate all vegetable oils. A few simple choices can help you get the fats your body needs:
- Include omega-3 sources. Fatty fish provides EPA and DHA, while flaxseeds, chia seeds and walnuts offer ALA.
- Keep nutritious omega-6 foods in your diet. Nuts, seeds and suitable vegetable oils can be part of a healthy eating pattern.
- Replace some saturated fats. For example, you can use an unsaturated vegetable oil instead of butter in certain dishes.
- Look at your overall diet. Protein, fiber, vitamins and minerals matter alongside the fats you eat.
The goal is to get enough essential fats from a variety of foods, not to chase a perfect number.
Frequently asked questions
Is Olive Oil a Good Source of Omega-3 or Omega-6?
Olive oil contains some omega-6 and very little omega-3. However, its main fat is oleic acid, a monounsaturated fat.
Even though it isn’t a major source of omega-3, olive oil can be part of a healthy diet, especially when it replaces some saturated fats.
Are Processed Foods Containing Omega-6 Unhealthy?
Not necessarily. A food doesn’t become unhealthy simply because it contains vegetable oil or omega-6.
Its overall nutritional content matters, including the amount of salt, sugar, saturated fat, fiber and other nutrients. That’s why two foods containing omega-6 can have very different nutritional profiles.
How Can You Tell If You’re Getting Enough Omega-3?
Start by looking at which omega-3-rich foods you usually eat and how often you eat them. There isn’t one specific symptom that can reliably confirm a low omega-3 intake.
If you don’t eat fish or follow a restrictive diet, it may help to discuss your ALA, EPA and DHA intake with a qualified healthcare professional.
What Should You Ask a Pharmacist or Doctor Before Taking Omega-3 Supplements?
If you’re considering supplements, especially at high doses or for a medical condition, these questions may help: Do I need a supplement, or am I getting enough from food? How much EPA and DHA would be appropriate for me? Could the supplement interact with medications I’m taking? Are there any risks I should consider, such as an irregular heartbeat?
When comparing omega-3 supplements, also check how many capsules or how much liquid the listed EPA and DHA amounts represent. Our guide to supplement serving size explains why the amount per serving isn’t always the same as the amount in a single capsule.
Marine supplements also differ in source and lipid form, which is worth understanding before comparing labels. Our article on krill oil and how it compares with fish oil looks at what those differences mean in practice.
These questions apply to supplements, not to eating ordinary foods that contain omega-3 or omega-6.
Final thoughts
Omega-3 and omega-6 aren’t fats you have to choose between. Your body needs both, and foods containing them can be part of a healthy diet.
The most useful approach is to make sure you’re getting enough omega-3, keep nutritious omega-6-rich foods in your diet and choose a variety of unsaturated fats.
Supplements may be useful in certain situations, but they’re not automatically necessary for everyone. If you’re considering one, our guide to dietary supplements and when they may be useful explains what to consider before making that decision.
References
- National Institutes of Health, Office of Dietary Supplements. Omega-3 Fatty Acids — Health Professional Fact Sheet. ods.od.nih.gov
- Harris WS, et al. (2009). Omega-6 Fatty Acids and Risk for Cardiovascular Disease: A Science Advisory From the American Heart Association. Circulation, 119(6), 902–907. doi.org
- Retterstøl K, Rosqvist F (2024). Fat and Fatty Acids — A Scoping Review for Nordic Nutrition Recommendations 2023. Food & Nutrition Research. foodandnutritionresearch.net
- Johnson GH, Fritsche K (2012). Effect of Dietary Linoleic Acid on Markers of Inflammation in Healthy Persons: A Systematic Review of Randomized Controlled Trials. Journal of the Academy of Nutrition and Dietetics. pubmed.ncbi.nlm.nih.gov
- Omega-6 Fatty Acids and the Risk of Cardiovascular Disease: Insights From a Systematic Review and Meta-Analysis of Randomized Controlled Trials and a Mendelian Randomization Study. Archives of Medical Science. pmc.ncbi.nlm.nih.gov
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