Why low PUFA eggs matter and how to get them with your backyard flock.

People come to backyard chickens for all kinds of reasons. Maybe you're deeply into nutrition and want to know exactly what's in your food. Maybe you care about how animals are raised and want full visibility into that. Maybe you've lost faith in the food system and decided to opt out of as much of it as you can. Maybe it's a little of all three, with some friendly chicken chaos thrown in.

Whatever brought you here, one of the best things about raising your own chickens is knowing exactly what goes into your eggs. You chose this life (or this hobby, or this slightly-out-of-control flock situation), and with it came something most people don't have: direct control over what your hens eat, and by extension, what ends up on your plate. And if you've been hearing more about PUFAs lately, you're probably wondering: does my flock's feed actually affect this? And what can I do about it?

Short answer: yes, and a lot. Let's dig in.

What Are PUFAs, Anyway?

PUFA stands for polyunsaturated fatty acid. It's a type of fat characterized by multiple double bonds in its carbon chain, which makes it chemically less stable than saturated or monounsaturated fats. The two main families are omega-3s and omega-6s. Both are essential fatty acids, meaning your body can't produce them on its own and has to get them from food.

Here's a practical way to think about it: PUFAs are essentially what we know as seed oils. Corn oil. Soybean oil. Canola oil. Sunflower oil. Safflower oil. Cottonseed oil. A useful rule of thumb? If an oil is liquid at room temperature, it's likely high in PUFAs. There are two notable exceptions: avocado oil and olive oil, both of which are liquid at room temperature but are primarily monounsaturated fats (oleic acid), which are much more stable. But most other liquid vegetable oils are predominantly PUFA.

Before seed oils took over, the everyday cooking fats in most American homes were butter, lard, tallow, and ghee. Stable, traditional, naturally low in PUFAs. Then came the 20th century food industry, which told us those fats were dangerous, and swapped in margarine (in place of butter) and Crisco (in place of lard). Both are made from partially hydrogenated or refined seed oils, and both dramatically increased Americans' intake of omega-6 PUFAs. And it didn't stop at the grocery store shelf. These fats worked their way into everything. The oil you cook with at home. The crackers, bread, and sauces in your pantry. The fryer oil at every restaurant you've ever eaten at. By the mid-20th century, high-PUFA seed oils had become the default fat in virtually every food context, homemade, processed, and restaurant alike. Which means most people are getting a heavy dose of omega-6 PUFAs at every single meal, whether they realize it or not.

Here's the thing: PUFAs aren't bad. Omega-3s are PUFAs. DHA (the fatty acid your brain depends on) is a PUFA. The problem isn't PUFAs themselves. It's the balance, or more accurately, the imbalance most Americans are living with right now.

Historically, humans ate a roughly 1:1 to 4:1 ratio of omega-6 to omega-3 fatty acids. The modern Western diet has pushed that closer to 15:1 or even 20:1. That dramatic skew toward omega-6s has been linked to chronic inflammation, which underlies a long list of health issues: cardiovascular disease, diabetes, obesity, joint problems, and more. On top of the ratio issue, PUFAs are prone to oxidation (thanks to those unstable double bonds), which can generate harmful compounds in the body.

And here's the part that often gets missed: this shift didn't just happen to the human food supply. It happened to animals, too. As industrial agriculture scaled up after the mid-20th century, livestock feed followed the same playbook, replacing traditional forage-based and diverse-grain diets with cheap, high-yield, PUFA-rich ingredients built around modern hybridized corn and soy. It wasn't just chickens. Pigs, beef cattle, dairy cows, and farmed fish all saw their diets transformed in the same direction. The animals that used to eat grass, forage, insects, and diverse grains were switched over to concentrated feed rations optimized for cost and growth rate. The fat profile of those animals changed with their diets. And then we ate them.

Reducing total PUFAs, and bringing the omega-6/omega-3 ratio back into balance, is one of the more actionable things you can do for your long-term health. And it turns out, your backyard flock is one of the most powerful tools you have to do it.

The Feed-to-Egg Connection

Here's the part that doesn't always make it into the seed oil conversation: animals absorb and reflect the fatty acid profile of what they eat. Feed a hen a high-PUFA diet, and she produces high-PUFA eggs. It's that direct.

What makes eggs particularly significant here is that dietary fatty acids transfer into egg yolks with unusual efficiency. The yolk is essentially a concentrated lipid depot, and it mirrors the hen's diet quite closely. This effect is actually more pronounced in eggs (and dairy) than in meat. When a hen eats a high linoleic acid diet, that linoleic acid shows up directly in the yolk. Muscle meat has somewhat more buffering, but eggs and dairy are highly responsive to changes in the animal's diet. Which means if you're eating eggs every day (and most of us are), the fatty acid profile of those eggs matters more than you might think.

This is why you can eat pasture-raised eggs and still end up with more PUFAs than you'd expect. Pasture access is wonderful. But if a hen's supplemental feed is loaded with modern hybridized corn and soy, the grazing doesn't fully offset it. The feed is the foundation.

As a backyard chicken keeper, you have something commercial egg producers generally don't: the ability to choose exactly what your hens eat. That's not a small thing. That's everything.

What to Avoid in Your Flock's Feed

If lowering PUFAs in your eggs is the goal, the ingredient list on your feed bag is the first place to look. Here's what to watch for:

Modern hybridized corn. Conventional layer feeds are often 50-60% corn by volume. Modern hybridized corn is high in linoleic acid, the primary omega-6 PUFA, and it transfers efficiently into the egg yolk. The more hybridized corn in the diet, the higher the omega-6 load in the egg. (Worth noting: this isn't true of all corn historically. Heritage corn varieties have a different, more balanced fat profile. But modern hybridized corn, which is what virtually all conventional feed uses, is a different story.) Merry Natural feed contains no corn.

Soybean meal. Another staple of conventional feed, and another significant source of omega-6 PUFAs. Soy-free feeds tend to have meaningfully better fatty acid profiles for this reason. Merry Natural is soy-free.

Seed oils added directly to feed. Some feeds add soybean oil, sunflower oil, or corn oil as an energy source or to help pellets bind. These are concentrated sources of omega-6 PUFAs and go straight into the bird's fat stores (and your eggs). Merry Natural adds no direct seed oils.

Here's the part that trips a lot of people up: not all corn-and-soy-free feeds are created equal. Removing corn and soy is a meaningful step, but it doesn't automatically make a feed low in PUFAs. Plenty of feeds replace those ingredients with other high-PUFA alternatives: sunflower seeds or oil, safflower, canola, peanuts, or other grain and oil combinations that are just as high in linoleic acid. The label "corn and soy free" tells you what's not in the bag. It doesn't tell you what is. You have to look at the full ingredient list and think about the fatty acid profile of each ingredient, not just whether the two most well-known culprits are present.

This matters for everything from commercial feed to your own DIY grain mixes. Swapping modern hybridized corn for another high-PUFA grain or oil doesn't solve the problem. The goal is a feed built from ingredients that are genuinely lower in omega-6 PUFAs, not just labeled differently.

What to Look FOR in Your Flock's Feed

Now for the more useful part. Instead of just swapping out the bad, look for feeds that are intentionally formulated for a better fatty acid profile:

Omega-3 sources. Fishmeal (especially from wild-caught fish like sardines) and hemp are strong sources. These ingredients actively bring the omega-6/omega-3 ratio back toward balance. Merry Natural uses fishmeal from wild-caught sardines as a primary omega-3 source.

A note on flaxseed. Flax is widely used as an omega-3 source in chicken feed, and it does increase omega-3 levels in eggs. However, flaxseed is also one of the richest sources of phytoestrogens (specifically lignans) of any food, and those compounds transfer into eggs when hens eat flax-based feed. The full picture of what that means for human health is a nuanced conversation worth its own blog post. But it was enough of a consideration that we chose not to include flaxseed in Merry Natural feed, opting for fishmeal from wild-caught sardines as our omega-3 source instead.

Low-PUFA fats, thoughtfully used. Feeds that use oils like wheat germ oil or sesame oil in controlled amounts, rather than high-PUFA seed oils, are working with the bird's biology, not against it. Sesame is particularly interesting: when seeds are processed to separate the oil, the resulting meal can actually help reduce the total PUFA load in the finished feed. Merry Natural processes sesame this way, adding only some of the oil back specifically to manage the PUFA contribution.

Whole grains over hybridized-corn-heavy bases. Oats, barley, and wheat tend to have more favorable fatty acid profiles than modern hybridized corn as a primary grain. A feed built around a diverse grain base will generally produce eggs with lower linoleic acid. Merry Natural's base includes oats, rolled wheat, peas, barley, and alfalfa.

Probiotics and digestibility support. Feeds that support optimal gut function help the bird actually absorb and utilize the good stuff in the diet. A hen that's digesting well is a hen converting her feed efficiently. Merry Natural includes a robust probiotic blend and uses raw liquid goat whey (added last to coat the feed) to support fermentation and digestibility in the bird's crop.

Transparency. Look for a feed company that can tell you exactly what's in their product and why. If a company can't explain their formulation, that's useful information too.

What Qualifies as a Low PUFA Egg?

There's no official government standard or certification for "low PUFA eggs" the way there is for, say, "organic." The term has developed organically (no pun intended) from farmers and researchers who have started testing eggs and publishing their results. But based on the data that exists, a working framework is emerging:

A note on how these numbers are expressed: PUFA content in eggs is typically reported two ways — as a percentage of total fatty acids, and as grams per 100g of whole egg. Both matter. The percentage tells you how the fat profile is composed. The grams tell you how much you're actually eating. (The figures below are based on approximately 10g of total fat per 100g of whole egg, which is a standard figure for large eggs.)

Conventional eggs — the baseline most low-PUFA eggs are compared against — typically test at 23% or higher total PUFAs (roughly 2.4g or more per 100g of egg), with linoleic acid in the 16-26% range (~1.6-2.6g per 100g), and omega-6/omega-3 ratios that can reach 20:1 or worse.

Low PUFA eggs are generally considered to fall below 20% total PUFAs (under about 2g per 100g of egg), with linoleic acid under roughly 15% (~under 1.5g per 100g), and an omega-6/omega-3 ratio of 4:1 or better. This is a meaningful improvement over the conventional baseline and aligns with what researchers consider a healthier range for human dietary fat intake.

Very low PUFA eggs — from farms that have pushed even further — tend to come in under 10% total PUFAs (under ~1g per 100g of egg) and under 8% linoleic acid. These are typically from operations that are extremely deliberate about every ingredient in their feed, often with a premium price to match.

Here's how eggs from hens on Merry Natural feed compare:

Merry Natural eggs land clearly in the low PUFA category. They're not the most extreme low-PUFA egg you'll find — there are farms focused specifically on minimizing total PUFAs above all else, and that's legitimate and valuable work. But they check every box for what the community considers low PUFA, and they do it while also delivering an exceptional omega balance and a broad vitamin profile. For us, it's always been about the whole picture, not just one number.

How Merry Natural Feed Gets You There

Merry Natural feed was formulated with all of this in mind. No modern hybridized corn. No soy. No direct seed oils added. No flaxseed. The grain base includes oats, rolled wheat, peas, barley, and alfalfa, and the formula uses fishmeal from wild-caught sardines as a key omega-3 source. Sesame seeds are processed to separate the oil before being included, with only some added back, specifically to reduce the PUFA contribution while retaining the benefits. The oils in the formula (sesame, fish, hemp, and wheat germ) are applied as a protective coating for the feed's nutrients and probiotics, not as a PUFA delivery vehicle.

Eggs from hens on Merry Natural feed were tested by Dr. Stephan Van Vliet, PhD, Director of the Food Metabolomics Lab at the University of Utah. The results: 18.37% total PUFAs, 10% linoleic acid, and a 4:1 omega-6/omega-3 ratio. Every other egg tested came in at 23.6% total PUFAs or higher, with linoleic acid between 16-26%.

That 4:1 ratio sits right at the upper end of what researchers consider optimal for human health. It didn't happen by accident. It happened because of what went into the feed, and just as importantly, what was left out.

The Bottom Line

If you're raising backyard chickens, you're already ahead. The eggs you collect are almost certainly better than what's on most grocery store shelves. But feed matters a lot. The same birds on different feeds will produce eggs with meaningfully different nutritional profiles. And "corn and soy free" alone isn't the whole answer. What goes in matters as much as what's left out.

You can't out-forage a bad feed. But with the right feed, your hens don't have to.

Want to see the full test results? Read about them here and see the actual spreadsheet of data here.

Resources

• Miller's Bio Farm: Egg Test Results — Yolk Color Does Not Matter
• Miller's Bio Farm: Miller's vs Angel Acres Eggs — Comparing PUFAs and the Omega Ratio
• NIH Office of Dietary Supplements: Omega-3 Fatty Acids — Health Professional Fact Sheet
• Oregon State University Linus Pauling Institute: Lignans
• MDPI: Fatty Acid and Antioxidant Profile of Eggs from Pasture-Raised Hens Fed a Corn- and Soy-Free Diet
• What Do Low PUFA Eggs Mean? Understanding Egg Nutrition
• ScienceDirect: Performance and Egg Quality of Laying Hens Fed Flaxseed — Highlights on n-3 Fatty Acids, Cholesterol, Lignans and Isoflavones
• Merry Natural: Egg Test Results