AUDIT SCOPE
This Is a Range Audit, Not a Single-Loaf Verdict
Jason’s sells plain sourdough loaves, seeded breads, protein products, rolls, crumpets, flavoured loaves and filled products. Their recipes differ enough to produce different NOVA classifications.
Published recipes checked 26 July 2026
The ingredients that split the range
The simpler products remain based mainly on flour, water, salt, fermentation, grains and seeds. Other products add ingredients that NOVA identifies as characteristic of ultra-processed formulations.
- Wheat gluton
- Wheat protein
- Pea protein
- Dextrose
- Flavourings
- Modified starch
The quickest reliable rule
Read the exact product name and ingredient list. Do not treat “Jason’s Sourdough” as a NOVA verdict, because the range contains both likely Group 3 and Group 4 products.
Verdict summary
Why the NOVA Verdict Changes Across the Range
NOVA places industrial bread made from familiar bread ingredients in Group 3 when no ingredient characteristic of ultra-processed formulations is present. That is the best fit for several of Jason’s simpler current products.
The classification changes when recipes introduce isolated proteins, industrial sugars or cosmetic additives. NOVA specifically identifies ingredients such as gluten, protein isolates, dextrose, flavourings, colours and modified starches as evidence that can support a Group 4 verdict.
Familiar bread ingredients
Flour, water, salt, yeast or sourdough fermentation, grains and seeds do not automatically create a Group 4 product.
Isolated proteins
Added wheat gluten, wheat protein and pea protein are ingredients of no or rare culinary use highlighted by NOVA.
Industrial sugars and additives
Dextrose, flavourings, colours and modified starches provide clearer Group 4 evidence.
Preservation alone is not decisive
Fermented wheat flour adds important context, but a preservative function alone does not automatically make every product Group 4.
the controversy
Why Has Jason’s Become Controversial?
Jason’s built its reputation on short ingredient lists and “no added preservatives” claims. However, investigations by the Real Bread Campaign and Sustain highlighted that fermented wheat flour used in the range generates propionic acid with a preservative function.
Jason’s says this supports its wording because no preservative is directly added to the dough as a purified additive. Critics argue that many shoppers would reasonably understand “no added preservatives” to mean that no ingredient is being used for preservation.
This disagreement is about transparency, not whether fermented wheat flour automatically makes the bread ultra-processed.
Timeline of the investigation
According to Sustain’s investigation, Jason’s said fermented wheat flour produces natural organic acids and metabolites and is not an additive or E-number. Sustain said the response did not directly answer whether it was cultured to generate propionic acid.
The Federation of Bakers stated that the fermentation process produces organic acids that inhibit mould and extend freshness and shelf life.
Sustain reported correspondence in which Jason’s confirmed that fermented wheat flour generates propionic acid with a preservative function. Jason’s said it occurs naturally in the process, explaining its “no added preservatives” wording.
Why this matters
Many shoppers are likely to understand “no added preservatives” as meaning that no ingredient is being used to preserve the bread. Whether that expectation is reasonable is separate from the NOVA classification, but it is a legitimate consideration when comparing supermarket loaves.
CHECK THE EXACT LOAF
Current Best Fits Across the Jason’s Range
This is a label-based range snapshot, not a claim that every product has been permanently classified. Recipes change, so the pack in your hand remains the final check.
Simpler loaves and crumpets
White Ciabattin, Grains & Seeds Ciabattin, Great White, Majestic Malted and plain Crumpets show no standard Group 4 marker on their current published labels. Best fit: Group 3.
Added-gluten loaves
Wholemeal Ciabattin and Fruit Loaf currently list added wheat gluten. NOVA identifies isolated gluten as characteristic of ultra-processed formulations. Best fit: Group 4.
Protein products and Tiger Rolls
Protein Loaf and Protein Rolls contain isolated wheat and pea proteins. Tiger Rolls contain dextrose and L-cysteine. Best fit: Group 4.
Filled toasties and hot rolls
ome current fillings contain flavouring, caramel colour, glucose syrup or modified starch. Assess the complete product, not only the bread component.
Products that still need an individual check
Every Day White Rolls and newly launched or reformulated products should be checked separately. A short front-of-pack claim is not enough to establish the NOVA group.
Refined vs cold-pressed
What Is the Difference?
In UK shops, rapeseed oil is usually sold in two broad forms. They are made differently and may taste different, but both remain Group 2 when sold as plain oils.
Neutral and widely used
Refined rapeseed oil is processed to remove flavour, colour and impurities. It is often cheaper, milder and more common in packaged foods.
Less refined, stronger flavour
Cold-pressed rapeseed oil is mechanically pressed and usually keeps more colour and flavour. It is still a processed culinary ingredient under NOVA.
Strict NOVA answer
Both refined and cold-pressed rapeseed oil are Group 2 when sold as plain oils. The difference may matter for taste, production method and personal preference, but it does not change NOVA’s classification of plain rapeseed oil as a Group 2 processed culinary ingredient.
Common misconceptions
4 Things Worth Separating
All refined oils are UPF
NOVA Group 2 includes refined culinary ingredients. Refining alone does not make plain rapeseed oil Group 4.
Cold-pressed means unprocessed
Cold-pressed oil is still extracted from a food crop, so it remains a processed culinary ingredient.
Any product containing it is UPF
Rapeseed oil can appear in simple, non-UPF foods. The rest of the formulation decides the classification.
Industrial processing always means NOVA Group 4.
Industrial processing is part of the picture, but NOVA does not classify foods solely by the amount of industrial processing involved.
Practical shopping advice
What To Do When You See Rapeseed Oil on a Label
- Do not stop at the word “rapeseed oil”. It is not an automatic UPF marker.
- Read the rest of the ingredient list. Look for flavourings, emulsifiers, sweeteners, modified starches, protein isolates, hydrogenated oils, interesterified oils and other modified ingredients.
- Consider the whole product. Ask whether it looks like an ordinary recipe made with culinary ingredients or a branded industrial formulation designed for convenience, texture and shelf life.
- Compare similar products. A simpler alternative may exist even when both products contain rapeseed oil, especially in bread, hummus, sauces, crackers and ready meals.
- Keep personal preferences separate. Choosing cold-pressed oil is reasonable, but it is not required by NOVA.
Bottom Line
The easiest approach is to stop treating rapeseed oil as an automatic warning sign. Under NOVA it is a Group 2 processed culinary ingredient. Read the whole ingredient list and decide whether the product is an ordinary food made with culinary ingredients or a Group 4 industrial formulation.
If the only concern is plain rapeseed oil, the product needs a wider check rather than an automatic UPF verdict.
That is the approach used throughout No More UPF: NOVA first, processing context second, and the whole product always.
Sources
Further Reading & References
Sources used for the NOVA classification and wider processing context.
- Monteiro CA, Cannon G, Levy RB, Moubarac JC, Louzada MLC, et al. Ultra-processed foods: what they are and how to identify them. Public Health Nutrition. 2019.
- Monteiro CA, Cannon G, Moubarac JC, et al. The UN Decade of Nutrition, the NOVA food classification and the trouble with ultra-processing. Public Health Nutrition. 2018
- Monteiro CA, Cannon G, Lawrence M, Louzada MLC, Machado PP. Ultra-processed foods, diet quality, and health using the NOVA classificaiton system. Food and Agriculture Organization of the United Nations.
- European Food Information Council. Food processing and classification context.
Supermarket sourdough has become big business and brands like Jason’s Sourdough position themselves as “clean label,” “no preservatives” and a more authentic alternative to standard factory bread.
For those reducing UPFs, it has become a go-to choice (including my own personal favourite) – a convenient option for people who want something that feels closer to traditional bakery sourdough without making it at home.
However, new information has raised questions about how it is made — and whether it aligns with what many people expect from non-UPF bread.
So is Jason’s sourdough UPF? Let’s take a look at what’s been going on.
What Jason’s Claims
Jason’s markets itself as:
- “No preservatives”
- “No additives”
- “Long fermentation”
- “Real sourdough mother culture”
- “Clean label”
On the surface, this looks simple. But the critical ingredient here is fermented wheat flour and what that actually means in modern industrial bread-making.
The Real Issue: What Is “Fermented Wheat Flour”?
In September 2025, the Real Bread Campaign / Sustain published a major investigation exposing the widespread use of fermented wheat flour in supermarket loaves:
🔗 https://www.sustainweb.org/news/sep25-fermented-wheat-flour-dirty-secret-behind-factory-loaf-clean-labels/
Key findings:
- many large bakeries use fermented flour treated with specific bacteria
- these bacteria produce propionic acid, which stops mould
- propionic acid functions as a preservative
- because it is produced via fermentation, it does not need to be listed as an additive or E-number
This creates a “clean label” effect — a loaf that looks simple but is still being preserved for longer shelf life.
Jason’s Private Confirmation
In private correspondence shared with Sustain on 3 November 2025, Jason’s confirmed:
“The fermented wheat flour does generate propionic acid, which has a preservative function.”
Jason’s defended its “no preservatives” claim by saying:
“It occurs naturally in the process – hence why we say no added preservatives.”
However, the function of the ingredient remains preservation, even if it is generated through fermentation.
The Federation of Bakers Confirms It Too
On 15 October 2025, the Federation of Bakers formally stated that fermented wheat flour is used as a preservative in bread production.
That statement is published here:
🔗 https://www.sustainweb.org/news/oct25-fermented-wheat-flour-is-a-preservative-confirms-bakery-trade-body/
This means the use of fermented wheat flour as a preservative is industry-standard and no longer in dispute.
Public Messaging: Direct Questions, Indirect Answers
This is where concerns around transparency intensify.
Consumers and the Real Bread Campaign have repeatedly asked Jason’s on Instagram and other public platforms whether fermented wheat flour is being used as a preservative.
Jason’s replies publicly with statements like:
“Our mother culture is the sole leavening agent.”
“Fermented wheat flour is produced with probiotic bacteria.”
“It is not an additive and not an added E-number.”
However…these responses do not answer the specific question at all.
They emphasise “naturalness” and “probiotics,” but avoid acknowledging the preservative function that they privately confirmed to Sustain.
This mismatch between private clarity and public vagueness is what concerns so many consumers -including me. The Real Bread Campaign has also pointed out the absence of a direct answer. When I buy from a brand, I expect honesty about their ingredients, not carefully worded replies. Jason’s has built a strong following among people avoiding UPFs (myself included), which makes their reluctance to be transparent even harder to overlook.
Is Jason’s Sourdough UPF?
Strict NOVA Classification
Under a strict interpretation of the NOVA classification system, Jason’s Sourdough does not automatically fall into Group 4 (ultra-processed food).
Its ingredient list is short:
- wheat flour
- water
- salt
- fermented wheat flour
It does not contain emulsifiers, artificial flavourings, colourings, sweeteners, stabilisers or multiple cosmetic additives typically associated with ultra processed bread.
NOVA Group 4 foods are generally defined as industrial formulations made using multiple extracted or synthesised ingredients, often including additives not used in normal culinary practice.
On formulation alone, Jason’s does not resemble standard supermarket sliced bread that clearly sits in Group 4.
Therefore, under strict NOVA criteria, it cannot be definitively classified as ultra processed. NOVA focuses on ingredient categories and overall formulation, rather than the specific industrial intent behind individual processes.
The Nuanced Issue: Function vs Classification
However, classification and consumer expectations are not always identical.
The confirmed use of fermented wheat flour to generate propionic acid — which has a preservative function — raises a separate issue.
While fermentation itself is a traditional process, using specific bacterial strains to intentionally generate mould-inhibiting acids for extended shelf life is a modern industrial technique.
This creates what many describe as a “clean label” effect:
- The ingredient list appears simple
- No E-number preservative is listed
- The bread achieves longer shelf life
From a strict NOVA perspective, this does not automatically move the product into Group 4.
But from a transparency perspective, some consumers may feel uncomfortable with:
- The marketing emphasis on “no preservatives”
- The absence of explicit acknowledgement of preservative function
- The use of technical wording that avoids clarity
That concern is valid — but it is separate from formal NOVA classification.
Why This Matters
Many shoppers choose Jason’s instead of industrial bread specifically to avoid ultra-processed foods.
Under strict NOVA classification, Jason’s does not clearly meet Group 4 criteria.
However, for those wanting bread made using only traditional sourdough methods — flour, water and salt — the use of fermented wheat flour designed to extend shelf life may feel misaligned with that expectation.
The issue here is less about whether it fits Group 4, and more about industrial technique and transparency.
Final Verdict
Under strict NOVA classification, Jason’s Sourdough does not clearly qualify as a Group 4 ultra-processed food.
However, the confirmed use of fermented wheat flour to generate preservative compounds raises legitimate transparency concerns and may not align with what some consumers expect from traditional sourdough.
It is not equivalent to heavily industrial supermarket bread containing emulsifiers and multiple additives.
For those strictly avoiding NOVA Group 4 foods, Jason’s does not automatically breach that threshold.
For those wanting the simplest and most traditional formulation possible, a bakery loaf containing only flour, water and salt remains the gold standard.
My Personal View
While Jason’s does not clearly qualify as a Group 4 ultra processed food under strict NOVA criteria, I personally feel uneasy about the use of fermented wheat flour specifically to generate preservative compounds.
For me, the issue isn’t just classification — it’s transparency. If an ingredient is performing a preservative function, I would prefer that to be communicated clearly. Having “no preservatives” on the packaging is quite misleading and that just doesn’t sit well for me.
That doesn’t make Jason’s equivalent to heavily industrial sliced bread. But where possible, I now choose simpler bakery loaves made with flour, water and salt.
Everyone’s threshold will be different — and that’s okay.
This article is based on publicly available information from Sustain, the Real Bread Campaign and Jason’s Sourdough. It reflects my personal interpretation of those findings and is not intended to make any legal, medical or professional claims. Readers should consult official sources or product labels for the latest information.