Omega-3s: The One Supplement Almost Everyone Is Short On

I take fish oil every day. I also keep a stack of Season sardines from Costco in my pantry — and before you close the tab, hear me out on those.

Omega-3s are one of the few supplements where the research is deep, consistent, and hard to argue with. They're essential fatty acids — meaning your body cannot synthesize them on its own. You have to get them from food or supplementation. And most people eating a typical Western diet are chronically short.

Unlike some supplements where the benefit is subtle or debated, the case for adequate omega-3 intake is well-established across cardiovascular health, brain function, inflammation, and joint health. The question isn't really whether omega-3s matter. It's whether you're actually getting enough — and from what source.

What Omega-3s Are and Why They're Not All the Same

Omega-3 fatty acids come in three forms that matter:

Both EPA and DHA come primarily from fatty cold-water fish and marine sources — which is why fish oil and oily fish are the most effective delivery vehicles for meaningful omega-3 intake.

What the Research Actually Shows

The evidence base for EPA and DHA is one of the most robust in nutritional science. Here's where it's consistently strong:

The Omega-6 to Omega-3 Problem

Here's the context most people miss.

As I covered in the seed oils article, the typical Western diet has an omega-6 to omega-3 ratio of approximately 16:1. The estimated ancestral ratio was closer to 1:1 to 4:1. That gap has widened dramatically over the last century — driven primarily by the explosion of seed oil consumption in processed foods.

Omega-6 and omega-3 fatty acids compete for the same metabolic enzymes. When omega-6 dominates — as it does in most modern diets — it suppresses the conversion and utilization of omega-3s, and shifts the body toward a more pro-inflammatory state.

Getting more omega-3 is part of the solution. Reducing processed food consumption — which is where most omega-6 exposure comes from — addresses the ratio from the other direction. Both matter.

How Much You Actually Need

The American Heart Association recommends 250–500mg of combined EPA and DHA daily for general cardiovascular health in healthy adults. For people with elevated triglycerides or cardiovascular risk factors, 1,000–2,000mg daily is commonly recommended.

For active adults — and specifically for anyone training hard, dealing with chronic inflammation, or over 40 — I think the case for staying at the higher end of that range is strong. Research on athletes and active adults points toward 2,000–3,000mg of combined EPA and DHA daily for meaningful anti-inflammatory and recovery benefits.

Always read the supplement facts panel, not the front label. What you want to see is the combined EPA+DHA per serving, not the total fish oil content.

Food Sources: Where Whole Fish Wins

Supplementation is convenient. But whole food sources of omega-3s have advantages that a capsule can't fully replicate — they come packaged with additional nutrients, they don't oxidize in the bottle, and they force you to build an eating habit rather than just a supplement habit.

The most practical high-omega-3 foods:

The Sardine Situation

Let me make a case for sardines specifically — and address the reason most people dismiss them before they've actually tried a quality product.

The standard objection to sardines is the image: soft, smelly, skin-on fish packed in oil that smells like a boat dock. That's a fair description of some products. It's not a fair description of all of them.

I buy Season brand sardines from Costco. These are deboned, skinless, and the texture and taste is closer to premium tuna than anything resembling the sardine stereotype. I eat them straight from the can. My kids eat them straight from the can. That tells you something.

From a nutritional standpoint, sardines are difficult to beat. A single 3.75 oz can delivers roughly 1,500mg of EPA+DHA, along with complete protein, calcium from the bones in skin-on varieties, vitamin D, vitamin B12, and selenium. They're one of the most nutrient-dense foods that exist in a convenient, shelf-stable package.

• Sardine "tuna" salad — mash with Greek yogurt or light mayo, diced celery, red onion, lemon juice, and black pepper. Serve on whole grain crackers or in a lettuce wrap. Nearly identical to a quality tuna salad, higher in omega-3s.
• On sourdough with avocado — open-face sardine toast with sliced avocado, a squeeze of lemon, and red pepper flakes. Takes three minutes.
• In a grain bowl — flake over brown rice or quinoa with cucumber, cherry tomatoes, olive oil, and lemon. Clean and fast.
• With eggs — chop and fold into scrambled eggs with fresh herbs. Works better than it sounds.

If you've only had sardines from the cheap tin at the back of a gas station shelf, try a quality brand before you write them off. The difference is significant.

Supplement Quality: What to Look For

Not all fish oil is created equal, and this matters more than most people realize.

Fish oil is a highly perishable product. The polyunsaturated fats in it oxidize — they go rancid — when exposed to heat, light, or oxygen. Rancid fish oil doesn't just taste bad; oxidized fats may actually cause harm rather than benefit. The fishy burp that most people associate with fish oil capsules is often a sign that the oil has already begun to oxidize.

• EPA+DHA content clearly listed — not just total fish oil. You want at least 500mg of combined EPA+DHA per capsule.
• Triglyceride form vs. ethyl ester form — triglyceride-form fish oil is more bioavailable and more stable. Ethyl ester is cheaper and more common but absorbs less efficiently. The label will sometimes specify; if it doesn't, assume ethyl ester.
• Third-party tested — look for IFOS (International Fish Oil Standards) certification or similar third-party purity testing. This confirms the product has been tested for heavy metals, PCBs, and oxidation levels.
• Expiration date and storage — buy from a supplier with reasonable turnover and store in the refrigerator after opening. Heat and light accelerate oxidation.
• No fishy smell at room temperature — open the bottle or bite a capsule. Fresh fish oil should smell mild and clean. Strong fishiness means oxidation is already underway.

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Timing and Practical Notes

Take fish oil with a meal that contains fat — absorption of EPA and DHA is significantly better in the presence of dietary fat. Taking it on an empty stomach is less efficient and more likely to cause the fishy aftertaste some people experience.

Splitting the dose across two meals rather than taking it all at once may improve absorption and reduce GI effects for people sensitive to fish oil.

There is no strong evidence that morning versus evening timing matters meaningfully. Consistency matters more than the clock.

The Bottom Line

Omega-3s are one of the few supplements where the research is broad, deep, and consistent. If you're eating a typical Western diet and not regularly consuming fatty fish, you are almost certainly short — and the gap has real implications for cardiovascular health, brain function, inflammation, and joint health over the long term.

Whole food sources first. Fatty fish two to three times per week covers most of your need. Season sardines from Costco are legitimately good and criminally underrated — give them a real chance before dismissing them.

If supplementing, read the label for actual EPA+DHA content, choose a quality product with third-party testing, and take it with food. Aim for at least 1,000–2,000mg of combined EPA+DHA daily if you're training seriously or managing chronic inflammation.

It's not a complicated supplement. It's just one most people are getting too little of.