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Omega-3 Fatty Acids: Nourishing Strength from the Inside Out
When we think about nutrition for strength training, protein usually gets most of the attention. And for good reason—protein provides the amino acids our muscles need to maintain and rebuild tissue.
But building a strong, healthy body involves more than protein alone.
Omega-3 fatty acids are another important part of the picture.
These essential fats are involved in cell membranes and signaling throughout the body, and the three omega-3s you will hear about most often are ALA, EPA, and DHA. ALA is an essential fatty acid, meaning our bodies cannot make it and we must obtain it from food. EPA and DHA are the long-chain omega-3s found primarily in seafood and marine-based supplements.
For women committed to strength training and an active lifestyle, omega-3-rich foods can be one more way to nourish the body we are asking to perform for us.
The Three Omega-3s to Know
ALA — Alpha-Linolenic Acid
ALA is the plant-based omega-3 found in foods such as:
- Chia seeds
- Flaxseed and flaxseed oil
- Walnuts
- Canola oil
- Soybean oil
Our bodies can convert some ALA into EPA and DHA, but that conversion is limited. For that reason, eating foods that provide EPA and DHA directly can be useful as part of a well-rounded diet.
EPA — Eicosapentaenoic Acid
EPA is found primarily in fatty fish and seafood. It participates in the production of signaling compounds involved in a variety of functions throughout the body.
DHA — Docosahexaenoic Acid
DHA is also found primarily in fatty fish and seafood. It is an important structural component of cell membranes and is especially concentrated in tissues such as the brain and retina.
EPA and DHA are often grouped together when you see omega-3 amounts listed on a fish-oil or algae-oil supplement label.
Omega-3s and Strength Training
This is where omega-3s become particularly interesting to me.
Researchers have been studying whether EPA and DHA may support skeletal muscle health and how muscles respond to exercise.
In one six-month randomized trial involving healthy adults with an average age of about 71, participants taking omega-3s experienced a modest improvement in muscle strength compared with those receiving a placebo.
Another study examining fish oil alongside 12 weeks of resistance training found that both resistance-training groups became stronger, while the group receiving fish oil also showed changes in certain measures of fat metabolism and inflammation.
But the evidence is not yet conclusive. A systematic review of randomized trials found that omega-3 supplementation did not significantly improve handgrip strength overall, and a large three-year trial also found no significant improvement in muscle strength from omega-3 supplementation.
So I would not think of omega-3s as a muscle-building supplement in the same way we think about resistance training and adequate protein.
Instead, I see them as part of the larger nutritional foundation that supports a strong body.
Strength training does the work. Good nutrition helps support the body doing that work.
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Omega-3-Rich Foods
Food is a wonderful place to start. Some of the richest sources of EPA and DHA include:
- Salmon
- Sardines
- Herring
- Mackerel
- Trout
- Certain types of tuna
- Oysters and other seafood
Plant foods can provide substantial amounts of ALA. For example, chia seeds, walnuts, flaxseed, and flaxseed oil are among the richer plant sources.
A Few Omega-3 Examples
According to the NIH Office of Dietary Supplements:
- 1 ounce chia seeds: about 5.1 grams ALA
- 1 ounce English walnuts: about 2.6 grams ALA
- 1 tablespoon whole flaxseed: about 2.35 grams ALA
- 3 ounces cooked Atlantic salmon: roughly 1.6–1.8 grams combined EPA and DHA, depending on whether it is wild or farmed
- 3 ounces sardines: roughly 1.2 grams combined EPA and DHA
Actual amounts can vary by food and source.
This is another reason I like a food-first approach. A salmon dinner gives me omega-3s while also providing
high-quality protein—two nutrients that fit naturally into a strength-focused eating pattern.
Add vegetables and a fiber-rich carbohydrate, and you have a meal that supports both training and everyday health and wellness.
How Much Omega-3 Do Women Need?
There is an established Adequate Intake for ALA, but there is currently no U.S. Recommended Dietary Allowance specifically for EPA or DHA.
For adult women, including women age 51 and older, the Adequate Intake for ALA is 1.1 grams per day.
That is important because it is easy to see a bottle labeled “Omega-3” and assume there is one universally recommended supplement dose. There isn’t.
Your individual needs can depend on your diet, health history, medications, and the reason you are considering supplementation in the first place.
What About Omega-3 Supplements?
If you regularly eat fatty fish and omega-3-rich plant foods, you may already be getting meaningful amounts through your diet.
For women who do not eat fish frequently, supplementation may be worth discussing with a
healthcare professional.
Common omega-3 supplements include:
- Fish oil
- Krill oil
- Algae oil
- Cod liver oil
Algae-derived omega-3 is especially useful for people who prefer a vegetarian source of DHA and, depending on the product, EPA.
Read the Supplement Label Carefully
This is one of the most important things to understand about fish oil. The amount of “fish oil” on the front of the bottle is not necessarily the amount of EPA and DHA you are getting.
For example, the NIH notes that a typical 1,000-milligram fish-oil supplement might contain approximately 180 milligrams EPA and 120 milligrams DHA, although formulations vary considerably.
So when comparing supplements, look at the Supplement Facts panel and find the actual quantities of
EPA + DHA rather than choosing solely by the total number of milligrams of fish oil.
That small distinction can make a big difference.
Is More Better?
Not necessarily. Omega-3 supplements can be appropriate for some people, but high-dose supplementation should not automatically be viewed as healthier.
The FDA considers supplements providing up to 5 grams per day of EPA plus DHA safe when used as directed, but clinical trials using 4 grams per day for several years found a slightly increased risk of atrial fibrillation among people with cardiovascular disease or a high risk of cardiovascular disease.
Omega-3s can also affect platelet activity and may interact with medications, particularly at higher doses.
If you take anticoagulants or other medications that affect bleeding, have a heart-rhythm condition, or are considering a high-dose omega-3 supplement, talk with your healthcare provider before adding one.
Also remember that prescription omega-3 medications used to treat specific medical conditions are not the same thing as an over-the-counter fish-oil supplement.
Food-First Approach
When possible, I prefer to think about omega-3s as foods rather than pills.
A few easy ways to work them into the week:
- Add chia seeds to yogurt or oatmeal.
- Sprinkle ground flaxseed into a smoothie.
- Add walnuts to salads.
- Serve salmon or trout for dinner.
- Keep canned salmon or sardines available for quick lunches.
- Add chia or walnuts to homemade baked goods.
- Use omega-3-rich foods alongside protein-rich meals.
None of these choices has to be complicated.
And that is really what Nourish is about.
It isn’t about chasing one “perfect” nutrient or depending on a cabinet full of supplements. It is about consistently giving our bodies the building blocks they need to support the lives we want to live.
Strength Is Built from More Than One Nutrient
Omega-3 fatty acids are valuable nutrients, but they work as part of a much bigger picture.
For those of us who strength train, the priorities remain clear:
Train consistently.
Eat enough protein.
Eat a variety of nourishing foods.
Recover well.
Stay active.
Omega-3-rich foods can fit beautifully into that foundation.
They aren’t a shortcut to strength. They are simply another way we can nourish it.
And when the goal is Strength for Life — Mind, Body & Spirit, supporting our bodies from the inside out is always worth the effort.
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Related Articles
For more information related to nutrition, muscle health, and strength training, you may want to read:
- Calcium and Strength Training for Older Women
- Casein Protein: Slow-Digesting Protein for Muscle Recovery
- Protein and Strength Training
- Vitamin D
- Eggs Are a Perfect Food
This article is for general educational purposes and is not a substitute for individualized medical or nutrition advice. Talk with your healthcare professional about supplements that may be appropriate
for you.
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