What Are Omega-3s, Omega-6s, And Omega-9s?
Most of us have heard it before: “Get your omega-3s!” Then, often followed by: “Eat more fatty fish!” or “Eat more flax and chia seeds!” Or, maybe you’ve even heard about omega-3 supplements, like fish oil, cod liver oil, krill oil, and flax oil. But, what about all of the omega 3 6 9 fatty acids? Why’s there so much hype around omega-3s? For some good reasons, actually.
In general, omega-3s are pretty much the super-est of superfoods. Because of this, you’ll find items like salmon and flax seeds—both excellent sources of omega-3 fatty acids—at the top of most superfood lists. In addition, studies link omega-3 consumption with some pretty serious benefits. Most notably, health benefits like a lowered risk of heart disease, decreased inflammation, cancer prevention, relief from depression, and even a delayed onset of memory problems and Alzheimer’s as we age. Yet, amazing as they are, omega-3s aren’t the whole story.
Omega-3s are just one category of fatty acids that do important work in our bodies. But, there are also omega-6s, as well as omega-9s—which are both common in vegetable oils, nuts, and seeds. And, despite the fact that they’re found in similar dietary sources, omega-6s and omega-9s aren’t the same, either! So, what’s the difference?? Here’s what you need to know about omega 3 6 9 fatty acids—and in which foods you’ll find them.
What Are Omega 3 6 9 Fatty Acids? Why Are They “Omegas”?
Fatty acids are molecules, known as hydrocarbon chains (a chain of hydrogen and carbon atoms). Somewhere near the end (the “omega”) of the carbon chain, there’s a double bond between two carbon atoms. Some fatty acids have this double bond at the 3rd carbon atom from the end of their carbon chain. These are “omega-3” fatty acids, which actually stands for “omega minus 3,” because the double bond is at the omega position, minus 3 atoms.
So, omega-6s have their double bond at the 6th carbon atom from the end of their carbon chain, and omega-9s double bond at the 9th carbon atom from the end of their chain. Pretty cool, right?!
These fatty acid molecules bond together to form the fats in our foods—usually in groups of three, known as triglycerides. Now, you may have heard about triglycerides in not-so-friendly terms, usually in relation to high levels of “blood triglycerides” (fat in the blood) and heart disease. While triglyceride levels can offer us some useful information about a person’s health, new research reveals that eating dietary fats isnot what raises triglycerides, cholesterol, or heart disease risk. (Researchers believe inflammation plays a major role, and triglycerides are also made in our bodies from the carbs that we eat!)
Fat Is NOT Bad—It’s Essential!
When we eat fats in our foods, our bodies break them back down into fatty acids. Those fatty acids are actually hugely important in our bodies—for energy, for energy storage, and really for all systems of our bodies to function. Because of this, the omega 3 6 9 fatty acids play a part in our skin health, respiratory system, circulatory system, organs, and especially in our brains. In addition, they help our bodies absorb vitamins and nutrients from food. And, the omega 3 6 9 fatty acids can help us regulate our blood pressure and inflammation. Fatty acids do a lot of work!
Most importantly, fatty acids are the building blocks of our cell membranes, and they are part of every cell in our bodies! Because of this, it’s worth considering our dietary intake of fatty acids. The kinds of fat that we eat directly affect us on a cellular level. Most of us know about saturated and unsaturated fats, but we’re focusing on unsaturated fats today. NOT because saturated fats are “bad” (that myth has actually been debunked). But, simply because the omega 3 6 9 fatty acids are all unsaturated fats.
Each of the omega 3 6 9 fatty acids offers our bodies benefits, but some are more important than others. First, there are the essential fats, which are omega-3s and omega 6s. Since the body can’t produce omega-3s or omega-6s on its own, we need to seek out dietary sources.On the other hand, omega-9s are non-essential fats because our bodies can produce them. Even though omega-9s aren’t ‘essential,’ we can still benefit from dietary sources like olive oil and avocados.
Although all of the omega 3 6 9 fatty acids are important, they work together in a delicate balance. All of these fats can be good! But, they can also lead to health problems if we eat them in the wrong ratios. (Learn more about this in my Balancing Omega-3s and Omega-6s blog!) All fats are NOT equal—not even all omega-3s. Fat can be a powerful nutrient, with major benefits (or consequences) to our health, depending on how informed we are.
As always, I’m excited to share the information I’ve learned about the omega 3 6 9 fatty acids with you all. Most importantly, I still encourage you to continue researching on your own so you can make informed choices about what’s best for you!
What are Omega-3s?
We’ve learned that omega-3s are just one of the omega 3 6 9 fatty acids. And, when people refer to omega-3s in a dietary sense like, “Get your omega-3s!” they’re talking about foods that contain omega-3s. Remember, the fats in foods get broken down by our bodies into fatty acids, which then go to work inside of us.
Omega 3s: The Basics
So, what are omega-3s?
- Polyunsaturated fatty acids (PUFAs)—which means they have many (“poly”) double bonds (“unsaturated”)
- Essential fats—the body can’t synthesize them, so we must consume them from dietary sources
Most Common Types Of Omega 3s
Long-Chain Fatty Acids
These fatty acids are found only in animal sources—specifically marine animals. Because of this, we often refer to them as marine omega-3s:
- EPA (eicosapentaenoic acid)—the body uses EPA to produce chemicals called eicosanoids, which help to reduce inflammation. Sufficient EPA in the brain may reduce symptoms of depression and lower the risk of suicide. EPA is also the precursor to DHA.
- DHA (docosahexaenoic acid)—makes up about 8% of our brains by weight, and over 90% of the omega-3s in the brain are DHA. Because of this, DHA is pretty darn important for brain development and healthy brain functioning. And, DHA is a component in every cell in your body!
Short-Chain Fatty Acid
This fatty acid comes mainly from plant sources. (Although, it exists in a few animal sources as well.):
- ALA (alpha-linolenic acid)—the body uses ALA for energy mainly. ALA is inactive in our bodies unless it’s converted into long-chain omega-3s like EPA and DHA. Though ALA can convert into EPA or DHA, the body is very inefficient at doing so. Because of this, ALA is not a sufficient substitute for EPA or DHA consumption.
Potential Benefits Of Omega 3s
There are mixed opinions about the benefits of ALA—some research shows it can be good for heart health, some shows a correlation with prostate cancer, and some shows little to no beneficial effect.
But, studies focusing on diets that are rich in marine omega-3s (DHA and EPA) have revealed some profound benefits:
- Fight inflammation—which contributes to chronic diseases, like heart disease, diabetes, cancer; can improve symptoms of rheumatoid arthritis
- Improve heart health—increase good cholesterol, reduce triglycerides, lower blood pressure, decrease plaque in arteries
- Support brain health—crucial to infant brain development, can improve memory and attention, slows the decline in brain function as we age (specifically eating fatty fish), can improve memory in older people and help delay Alzheimer’s or prevent dementia
- Protect our eyes—guard against retina damage and macular degeneration
- Promote bone and muscle health—better bone mineral density, can ease symptoms of cystic fibrosis
- Foster mental health—reduce symptoms of depression, schizophrenia, bipolar disorder; reduce risk of psychotic disorders
- Help with weight loss—aid in weight management, reducing waist size, and decreasing liver fat
Omega 3s Recommended Intake
- The Food and Nutrition Board of the U.S. Institute of Medicine sets the adequate omega-3 intake at 1.6g for men and 1.1g for women per day.
- The World Health Organization (WHO) recommends eating at least 2 servings (3.5oz each) of fatty fish per week, like salmon, herring, sardines, and anchovies.
- Because of the risk of mercury content in fish, it’s ideal to obtain our marine omega-3s from small, wild-caught fish that are free of toxins.
- While nuts and seeds are the main source of ALA, you can also find smaller amounts of ALA in some vegetables.
Omega 3 Foods
Here are a few examples of foods with higher omega-3 content. Keep in mind, these animal-based sources provide primarily EPA and DHA, while the plant-based sources only provide ALA. Because of this, plant- and animal-based omega-3s function differently in our bodies and provide different benefits. (Check out my Balancing Omega-3s and Omega-6s blog to learn about the difference between plant and animal omega-3s!)
And, these are just some of the omega-3 foods in the world—there are many more!
Animal-Based Omega-3 Sources:
- Salmon (wild-caught is best!)
- Omega-3 supplements (very poor absorption rate compared to eating real seafood)
- Small amounts in organs/fat of land animals
Plant-Based Omega-3 Sources:
- Chia seeds & chia oil
- Flaxseeds & flax oil
- Walnuts & walnut oil
- Hemp seeds
- Pumpkin seeds
- Canola oil
- Roasted soybeans
- Winter squash
- Brussels sprouts
*Beware of high mercury content in these fish!
What are Omega-6s?
People often confuse omega-6s with omega-3s or use the two terms interchangeably, but they’re not the same! There are a few key differences:
Omega 6s: The Basics
Much like, omega-3s, omega-6s are:
- Polyunsaturated fatty acids (PUFAs)
- Essential fats
BUT, omega-6s are generally:
- Both anti-inflammatory and pro-inflammatory—some omega-6s are anti-inflammatory, but some are pro-inflammatory. This inflammatory response helps our bodies repair after strenuous exercise. But, for prolonged periods, this inflammation can be harmful.
Most Common Types Of Omega 6s
- Linoleic acid (LA)—one of the most common omega-6s we find in our food sources, especially vegetable oils like corn oil, soybean oil, sunflower oil, and canola oil); LA takes on many other forms:
- Conjugated linoleic acid (CLA)—a slightly altered form of linoleic acid, found in grass-fed meat and dairy products, known as a supplement for bodybuilding that may help reduce body fat mass
- Gamma-linolenic acid (GLA)—found in certain vegetable oils (like primrose and hemp seed oil), and is produced in the body from LA; much of GLA converts into DGLA, which is another source of anti-inflammatory eicosanoids (like EPA)
- Arachidonic acid (ARA or AA)—linoleic acid must convert into other longer-chain omega-6s like ARA to become active in the body; ARA is important for the immune system; prevalent in the brain, liver, and especially skeletal muscle; produces both pro- and anti-inflammatory eicosanoids in the body
Potential Benefits Of Omega 6s
- Promote skin and hair growth
- Help maintain bone health
- Aids in repairing and growing our skeletal muscle—helps us recover after exercise, specifically ARA
- Can help increase lean body mass—some studies link ARA with building strength and it’s often used as a bodybuilding supplement; some bodybuilding supplements also use CLA, but recent research suggests these are pro-inflammatory
- Regulate metabolism
- Potentially cancer preventative—some studies link CLA to cancer prevention and slowing the growth of tumors; GLA may aid in breast cancer treatment
- Some anti-inflammatory effects—both ARA and GLA have some anti-inflammatory properties, and GLA supplements may reduce symptoms of rheumatoid arthritis
But, omega-6s in general tend to have a pro-inflammatory effect, which can contribute to chronic inflammation in our bodies. Serious, chronic diseases like heart disease, diabetes, and cancer can result from chronic inflammation. Now, this doesn’t mean omega-6s are bad by any means—our bodies do need them. But, the problem is that most of us (especially in industrial societies) consume far too many omega-6s in our diets.
As with omega-3s (and all of the omega 3 6 9 fatty acids), there aren’t yet official standards or requirements for daily omega-6 intake.
- The Food and Nutrition Board of the U.S. Institute of Medicine sets the adequate daily intake of omega-6s at 17g for men and 12g for women (for adults 19-50 years old).
But, we should still be wary of this guideline. Research on fatty acids is still new and conclusions are uncertain. However, one thing is becoming more clear: the ratio of our omega-6 to our omega-3 intake is crucial to our health.
For optimum health, we should aim for an omega-6 : omega-3 ratio somewhere between 2:1 or 4:1. Generally, that means eating only around 2 to 4 times as many omega-6s as omega-3s. Despite this, most people in Western nations consume far more omega-6s than omega-3s, with ratios averaging around 15:1 and as high as 50:1! And, even the adequate omega-6 and omega-3 intakes from the Food and Nutrition Board result in an over 10:1 ratio.
We’re eating fewer omega-3s and eating more omega-6s than ever. This is because we’re consuming more vegetable oils than ever, in processed foods, baked goods, restaurant meals, and even in our own cooking. And, this ratio imbalance plays a major role in chronic inflammation and chronic diseases. Because of this, it’s important to pay attention to our intake of omega-6s and omega-3s and modify as needed! For most of us, we need to limit our omega-6 intake and increase our omega-3 intake.
(Again, I explain this in detail in my Balancing Omega-3s and Omega-6s blog!)
Omega 6 Foods
In general, there are some common sources of omega-6 foods—mainly vegetable oils, nuts, and seeds. Most importantly, some of these omega-6 sources, like vegetable oils, have a well-studied inflammatory effect on our bodies. Remember, some omega-6s aren’t inflammatory, but omega-6s have an inflammatory effect in general when consumed in excess. We do need some omega-6s! But, many of us need to consider lowering our current omega-6 intake and increasing intake of marine omega-3s.
Vegetable Oils High in Omega-6s:
- Grapeseed oil
- Safflower oil
- Soybean oil*
- Corn oil*
- Cottonseed oil
- Sunflower oil
- Sesame oil
- Walnut oil
- Peanut oil
- Canola oil*
Nuts & Seeds High in Omega-6s:
- Sunflower seeds
- Pumpkin seeds
- Sesame seeds
- Pine nuts
- Brazil nuts
- Peanuts & peanut butter
- Almonds & almond butter
- Cashews & cashew butter
Other Omega-6 Sources:
- Chicken, turkey, duck, pork—esp. fats & skin
- Egg yolk
- Cheese, milk, butter
- Fried foods (typically fried in vegetable oils)*
- Processed foods*
- Baked goods*
- Restaurant & fast food meals (often cooked in vegetable oils)*
- Salad dressings*
*These items are major sources of omega-6s in many of our diets. And, there are negative health consequences associated with many of these foods. By limiting our intake of these foods, we can better balance our omega-6 : omega-3 ratio.
Even if you don’t cook with vegetable oils at home, SO many processed foods, baked goods, salad dressings use vegetable oils. And, they’re the most common oils for cooking in restaurants. Specifically, the items listed above are common foods that some of us may eat every day. In general, these foods tend to be major culprits that throw our omega-6 : omega-3 ratio out of balance. So, start paying attention to your omega-6 and omega-3 intake—you may need to make some changes to your typical diet.
What are Omega-9s?
Omega 9s: The Basics
Unlike omega-3s and omega-6s, omega-9s are:
- Monounsaturated fatty acids (MUFAs)—which means they only have one (“mono”) double bond (“unsaturated)
- Non-essential fats—the body can produce them, so we don’t technically need to consume them in our diet
The body produces omega-9s, a.k.a. MUFAs, when we already have enough omega-3s and omega-6s. Because of this, omega-9s are “non-essential.” But, they still play an important role in our health. In fact, omega-9s are the most abundant fats in most cells in our bodies! Because of this, they end up performing some important functions, like carrying vitamins and minerals to our cells. And, there are no known negative side effects associated with consuming MUFAs.
Most Common Type Of Omega 9s
- Oleic acid—occurs naturally in some vegetable and animal oils, especially olive oil and macadamia oil; oleic acid specifically is the second-most abundant fatty acid in the human body
Potential Benefits Of Omega 9s
There’s plenty of hype surrounding the Mediterranean Diet and its many health benefits. This is because the Mediterranean diet is characteristically high in omega-9s (MUFAs) like olive oil! MUFAs have loads of health benefits, and researchers have done their fair share of work studying them:
- Heart healthy—on a low-fat diet, researchers found that increasing monounsaturated fats in the diet to replace saturated fats could lower triglycerides and balance cholesterol levels
- Anti-inflammatory—MUFAs can reduce inflammation in our bodies, which ward of chronic diseases and ease symptoms of other conditions like arthritis
- May improve insulin sensitivity—a study in Ireland found that diets rich in oleic acid helped lower fasting glucose and insulin levels, while also improving blood flow
- Can help with weight loss—especially for those at-risk for obesity, more MUFAs and fewer saturated fats can help lower body fat and decrease waist circumference
- Can improve immune function
- Mood elevator—in some studies, MUFAs helped reduce anger levels and reduced individuals’ risk of depression
- Strengthens bones—helps our body to absorb nutrients like calcium more efficiently, so our bones can actually use it
- Potentially cancer–fighting—various studies link MUFAs to a lower risk of some cancers
Omega 9s Recommended Intake
Again, there are no existing intake requirements or recommendations for omega-9s. This is, in part, because our bodies can produce them. (Although, if our bodies didn’t get enough omega-3s or omega-6s for some reason, then we’d need to get omega-9s from our diet. Because, without omega 3-s or omega-6s, the body can’t produce omega-9s.) But, clearly, MUFAs offer our bodies some serious benefits and deserve a place in our healthy lifestyles!
Omega 9 Foods
Although omega-9s are ‘non-essential fats,’ they still offer our bodies healthful nutrients and benefits. Plus, many of them are delicious! You’ll notice that many of the foods on these omega-3, omega-6, and omega-9 lists overlap. Remember, we need different fats in our bodies to function. Likewise, foods also overlap in terms of their fatty acid composition. Because of this, many foods contain all 3 of the omega 3 6 9 fatty acids!
Vegetable & Seed Oils:
- Olive oil
- Cashew nut oil
- Almond oil
- Avocado oil
- Peanut oil
- Canola oil
- Safflower oil
- Sunflower oil
- Macadamia nuts
- Peanuts & peanut butter
- Almonds & almond butter
- Sesame seeds
- Pumpkin seeds
- Flax seeds
- Red meat
Other Plant-Based Sources:
Finding Balance With Omega 3 6 9 Fatty Acids
And, remember, most of us generally need to increase our intake of omega-3s (especially marine omega-3s) if possible, in order to bring our bodies into a healthy balance. Ultimately, knowledge is power! Continue to seek out information and educate yourself. Read nutrition labels and ingredients lists. Listen to your body and pay attention to how you feel. YOU have to decide what’s right for you and your body!