From a research station on Irish soil, a quiet but consequential question has been answered: not all oats are equal. Teagasc scientist Daniela Freitas and her team have spent years measuring the nutritional variation across 95 oat cultivars, discovering that the difference between a heart-healthy habit and an impractical one may lie simply in which variety a farmer chooses to plant. In a country where oats are both an agricultural staple and a dietary cornerstone, this research places an ancient grain at the intersection of public health, agricultural policy, and the enduring human search for
Irish oat research identifies varieties with vastly different nutritional profiles
Some require 2.5 bowls daily; others need just one.
Mark
Why does it matter that oat varieties have such different beta-glucan levels? Isn't oat porridge still healthy either way?
Mimi
It matters because the health claim—the cardiovascular benefit—is tied to a specific dose. You need 3 grams daily. If your oat variety is low in beta-glucan, you're eating two and a half bowls to get there. That's not sustainable for most people. If it's high, one bowl does it. The difference between a habit people can actually maintain and one they'll abandon.
Mark
So this is really about making health claims achievable?
Mimi
Exactly. Right now, someone might buy oats thinking they're doing their heart good, but if they're eating a low-beta-glucan variety, they'd need to consume an impractical amount. We're saying: let's know what we're actually growing, and let consumers and farmers make informed choices.
Mark
The protein variation is striking too—twofold difference. Why would that matter to a farmer?
Mimi
Because different markets want different things. A farmer might grow oats for animal feed, where protein matters less. Or they might grow for the human food market, where consumers increasingly care about protein content. If you can grow a high-protein variety without sacrificing yield or resilience, that's a competitive advantage.
Mark
You mentioned your next phase looks at digestion and blood sugar. That feels like a different question entirely.
Mimi
It is, but it's connected. Knowing the nutritional content is one thing. Understanding how the body actually processes it—how quickly it breaks down, how it affects blood sugar—that's where real health outcomes live. Some oat varieties might digest differently than others. We don't know yet.
Mark
Why does blood sugar control matter so much to you personally?
Mimi
Because it's preventive. The way we manage blood sugar now shapes whether we develop metabolic disease later. Most nutrition advice is reactive—treat the disease after it appears. I'm interested in the upstream question: what can we eat, and how can we prepare it, to keep our blood sugar stable in the first place?
Mark
And you think oat variety could be part of that answer?
Mimi
I think it could be one part. We don't have the answer yet. That's what the next phase is for.
Der Puls
- The assumption that a bowl of porridge is a bowl of porridge has been quietly dismantled — beta-glucan content varies so dramatically between cultivars that some require nearly twice as much oat consumption to deliver the same cardiovascular benefit.
- Protein levels tell an equally urgent story, with the best-performing varieties offering the protein equivalent of one and a half eggs per bowl — a gap that matters enormously for those managing satiety, muscle health, or aging.
- Irish farmers have long chosen oat varieties based on yield and resilience, but the NutriOats findings now press a new question onto the agricultural calendar: should nutritional profile become a criterion for what gets planted?
- The research team is already moving toward the next frontier — how different cultivars are actually digested and how they shape blood sugar response, a line of inquiry with direct implications for metabolic disease prevention.
- Ireland's dominant oat variety, Husky, sits in the middle of the nutritional spectrum — neither the best nor the worst — leaving open the possibility that a deliberate shift in cultivation could meaningfully improve population-level health outcomes.
From a research station on Irish soil, a quiet but consequential question has been answered: not all oats are equal. Teagasc scientist Daniela Freitas and her team have spent years measuring the nutritional variation across 95 oat cultivars, discovering that the difference between a heart-healthy habit and an impractical one may lie simply in which variety a farmer chooses to plant. In a country where oats are both an agricultural staple and a dietary cornerstone, this research places an ancient grain at the intersection of public health, agricultural policy, and the enduring human search for nourishment that is both simple and sufficient.
Daniela Freitas is a research fellow at Teagasc, Ireland's agricultural research body, and the question she has been trying to answer sounds deceptively simple: which oat is best? After testing 95 cultivars grown at Oak Park and analysed at Moorepark in Cork, the answer turns out to be: it depends entirely on what your body needs.
The heart of the finding lies in beta-glucan, the soluble fibre that gives oats their cardiovascular reputation. To gain a meaningful benefit, a person needs roughly 3 grams of it daily — but the cultivars Freitas tested ranged from 2.8 percent beta-glucan to 6.6 percent. At the lower end, that means two and a half bowls of porridge every day; at the higher end, just over one. Ireland's most widely grown variety, Husky, sits comfortably in the middle. The gap is not academic — it is the difference between a sustainable habit and an unrealistic one.
Protein content follows a similar arc. The best-performing cultivars deliver 9.2 grams of protein per bowl — roughly equivalent to one and a half boiled eggs — while the weakest offer half that. For farmers and agricultural planners who have traditionally weighed yield, pest resistance, and growing conditions, the NutriOats project now adds a new variable: nutritional profile. Freitas works alongside PhD student Nefeli Lampoglou and collaborators from University College Cork, all funded by Research Ireland.
Freitas's curiosity extends further still. She is investigating how oat starches are digested and whether the acidity of a meal can slow the enzyme that converts starch to sugar, potentially moderating blood sugar spikes — a question with direct relevance to metabolic health and type 2 diabetes prevention. The next phase of NutriOats will examine how different cultivars behave inside the body, research that could influence not just what farmers grow but what consumers reach for at the supermarket shelf.
Freitas came to this work through Portugal, France, and Ireland — a European arc in human nutrition that eventually landed her at Teagasc, where she has remained. She is wary of the language that sorts food into moral categories. What matters, she says, is understanding what we are actually eating — not labelling it good or bad, but knowing its content, its context, and its place in a balanced life.
Daniela Freitas sits in a research lab where the answer to a deceptively simple question has turned out to be far more complicated than anyone expected. The question: which oat is best? The answer, after testing 95 different varieties grown across Irish soil, is that it depends entirely on what your body needs.
Freitas is a research fellow at Teagasc, the Irish agricultural research body, and she has spent the last phase of the NutriOats project measuring the nutritional content of oat cultivars—the deliberately bred varieties that farmers choose to plant. Oats matter in Ireland. They grow reliably in the Irish climate, they anchor the country's agricultural economy, and they carry genuine health benefits, particularly for the heart. The beta-glucan fibre in oats supports cardiovascular function, but here is where the complication arrives: to actually feel that benefit, a person needs to consume about 3 grams of beta-glucan daily. The problem is that not all oats contain the same amount.
When Freitas and her team grew their 95 cultivars at Teagasc Oak Park and then tested them at Moorepark, the food research centre in Cork, they found a striking range. Some varieties contained just 2.8 percent beta-glucan—meaning someone would need to eat two and a half bowls of porridge every single day to hit that 3-gram target. Others contained 6.6 percent, requiring just one bowl plus an extra spoonful. The main cultivar currently grown across Ireland, a variety called Husky, sits comfortably in the middle of that spectrum. The difference is not trivial. It is the difference between a manageable daily habit and an impractical one.
The protein story follows a similar pattern. The team found a twofold difference in protein levels between the lowest and highest cultivars. The top performers deliver 9.2 grams of protein in a standard bowl of porridge—roughly equivalent to one and a half boiled eggs. For someone trying to build muscle or maintain satiety through the morning, that distinction matters. For someone else, it might be irrelevant.
This is where the research shifts from laboratory curiosity to practical decision-making. When Irish farmers and agricultural planners choose which oat varieties to grow, they have traditionally weighed factors like yield, resilience to pests, and growing conditions. Now they can add another layer: nutritional profile. Freitas works alongside her PhD student Nefeli Lampoglou and a team that includes agricultural experts from Teagasc and University College Cork. Together, they can identify which cultivars offer relatively high levels of protein, which deliver more soluble fibre, which might suit different consumer needs. The research is funded by Research Ireland, and the implication is clear: oats are not a monolith.
Freitas's own research extends beyond simple nutritional counting. She has become absorbed in the question of how the body processes oat starches and controls blood sugar in response. Her work explores whether making a meal more acidic can slow the enzyme in saliva that begins breaking down starch into sugars, potentially flattening the blood sugar spike that follows. This is not abstract biochemistry—it touches directly on metabolic health and the prevention of conditions like type 2 diabetes. The next phase of the NutriOats project will examine how different oat cultivars are actually digested in the body and how they influence blood sugar control. That research could reshape not just which oats farmers grow, but which oats consumers choose to eat.
Freitas arrived at this work through a winding path. She completed her bachelor's degree in human nutrition in Portugal, where she is from, then pursued a European master's in food innovation split between Ireland and France. She stayed in France for her PhD, also in human nutrition, before moving to Ireland to work at Teagasc. She has remained there since. When asked what she wishes people understood better about nutrition, she pushes back against the language of moral judgment. She dislikes the habit of sorting foods into categories of "good" and "bad." Instead, she advocates for balance—the idea that food exists on a spectrum, and that understanding the actual nutritional content of what we eat matters more than applying simplistic labels. Outside the lab, her life is quieter: time with her daughter and partner, walks through the Irish landscape that grows the oats she studies.
Bemerkenswerte Zitate
Depending on what you want, you can get it from different oats.— Daniela Freitas, research fellow at Teagasc
I encourage people not to put foods into categories like 'bad foods.' Instead I like to promote the idea of balance.— Daniela Freitas
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