Common Food Preservatives Linked to High Blood Pressure: What a 112,000-Person Study Found

Reviewed by the HealthyMag Editorial Team. Last updated: June 2026.

For years the standard advice on processed food and heart health has focused on three culprits: too much salt, too much added sugar, and too much saturated fat. A large new study suggests we may need to widen the lens. On May 20, 2026, researchers in France published data tracking more than 112,000 adults and reported that the very preservatives used to keep packaged food fresh — substances most of us never think about — were associated with measurably higher rates of high blood pressure and heart disease.

It is one of the first large human studies to point a finger specifically at preservatives as a category, rather than at processed food in general. The findings are striking, but they also come with important caveats that deserve as much attention as the headline numbers. Here is what the study actually found, what it can and cannot tell us, and what a sensible person might do about it.

What the new study found

The research was published in the European Heart Journal by Anaïs Hasenböhler, Dr. Mathilde Touvier and colleagues at Université Sorbonne Paris Nord, drawing on France’s NutriNet-Santé cohort — an ongoing national nutrition study that has followed volunteers since 2009. This analysis included 112,395 participants (about 79% women, average age 42.8 years) who were free of cardiovascular disease at the start.

What makes NutriNet-Santé unusually powerful is the level of dietary detail. Participants logged exactly what they ate during repeated three-day periods, down to the specific branded products. That let researchers trace which preservatives — not just which food groups — each person was actually exposed to. Notably, 99.5% of volunteers had consumed at least one preservative additive within their first two years in the study, underscoring how unavoidable these ingredients have become.

Over a median follow-up of roughly 7.6 to 7.9 years, the researchers recorded 5,544 new cases of high blood pressure and 2,450 cardiovascular disease events (1,308 coronary heart disease cases and 1,142 strokes or other cerebrovascular events). The headline comparisons, contrasting the highest consumers of preservatives against the lowest:

• Non-antioxidant preservatives: 29% higher risk of high blood pressure (hazard ratio 1.29, 95% CI 1.20–1.39) and 16% higher risk of cardiovascular disease (HR 1.16, 95% CI 1.04–1.29).
• Antioxidant preservatives: 22% higher risk of high blood pressure (HR 1.22, 95% CI 1.13–1.31).

After statistical correction for testing many additives at once, eight individual preservatives remained significantly associated with hypertension, and one — ascorbic acid (vitamin C used as an additive, E300) — was also linked to cardiovascular disease specifically.

Which preservatives were implicated and where they hide

Perhaps the most counterintuitive part of the study is the list of additives involved. Some are exactly what you would expect; others sound downright wholesome. The eight preservatives individually tied to higher blood-pressure risk were:

*Ascorbic acid (E300) was the additive also linked to cardiovascular disease, not just blood pressure.

Two things stand out. First, sodium nitrite — the additive most associated in prior research with cured-meat health risks — shows up again here. Second, several additives on the list are chemically identical to nutrients we think of as healthy: ascorbic acid is vitamin C, citric acid is the tart compound in citrus fruit, and rosemary extract comes from an herb. The crucial distinction is dose and context: an orange delivers vitamin C wrapped in fiber and water, whereas E300 in a packaged sausage is a marker of an industrially processed product. The additive itself may simply be a fingerprint of heavily processed food, a point we return to below.

How preservatives may affect blood pressure and the heart

The study was designed to find associations, not to explain biological mechanisms — but researchers and prior laboratory work offer several plausible pathways worth understanding.

Nitrites and blood vessel function. Added nitrites can form compounds in the body that may impair the lining of blood vessels (the endothelium), reducing the vessels’ ability to relax and potentially nudging blood pressure upward. This is a different story from the nitrates found naturally in vegetables like beetroot and spinach, which the body tends to convert into beneficial nitric oxide. If you are curious about that contrast, our deep dive on whether beetroot juice actually lowers blood pressure explains why “natural” nitrate is not the same as additive nitrite.

The gut microbiome. A leading hypothesis across additive research is that emulsifiers and preservatives may disturb the balance of gut bacteria and thin the protective mucus layer of the intestine, promoting low-grade inflammation. Chronic inflammation is itself a recognized contributor to high blood pressure and atherosclerosis.

The “processing marker” explanation. The most cautious interpretation is that preservatives are a proxy. People who eat more of these additives are, almost by definition, eating more ultra-processed food — which tends to be higher in salt, refined starch and calories, and lower in fiber and potassium. In that view, the additive is partly a signpost pointing to an overall dietary pattern, not necessarily the sole driver. The researchers adjusted for many of these factors, but no statistical adjustment is perfect.

What the study can and can’t prove

This is the part that responsible coverage cannot skip. The study is large, carefully conducted and adds genuine knowledge — but it has real limits, and the researchers themselves are clear about them.

It is observational, so it cannot prove causation. The design can show that higher preservative intake travels alongside higher rates of high blood pressure and heart disease. It cannot prove the additives cause those outcomes. Something else linked to eating these foods could be doing the damage.

Confounding from overall diet and lifestyle is hard to fully remove. Heavy consumers of preservative-rich food may differ in dozens of ways — more salt, less exercise, more sitting, different income or stress levels. Researchers statistically adjust for known factors, but residual confounding always remains a possibility, especially when the additive is so tightly bundled with processed-food patterns.

Diet was self-reported. Even with detailed records, people misremember and under-report what they eat, and additive content was estimated from product databases that may not capture every reformulation.

The cohort is not fully representative. NutriNet-Santé volunteers are disproportionately women, health-conscious, and French; eating patterns and product formulations differ elsewhere. And the absolute risk increases, while real, are modest at the individual level — a 29% relative increase applies to a baseline that is small for any one person in a given year.

Some findings are biologically puzzling. The link to ascorbic acid and rosemary extract — substances with antioxidant properties — suggests these additives may be markers of processing rather than direct toxins. That ambiguity is a reason for measured interpretation, not alarm.

In short: this is a reason to be thoughtful about heavily preserved foods, not a reason to panic about every ingredient label. Single observational studies rarely settle anything on their own — but this one does not stand alone.

Practical takeaways: how to read labels and what to swap

You do not need to memorize E-numbers or fear your pantry. A few practical habits capture most of the benefit:

• Shift the ratio, don’t chase perfection. The study compared the highest consumers to the lowest. Moving from the top tier toward the middle — cooking a few more meals from whole ingredients each week — is where the meaningful change lives.
• Treat processed and cured meats as the priority. Sodium nitrite, sodium erythorbate and sodium ascorbate cluster in bacon, ham, hot dogs and deli meats. This is the single most evidence-backed swap: choose fresh, unprocessed proteins most days.
• Scan for a long additive list as a quick heuristic. You don’t need to know each E-number. A product with a short, recognizable ingredient list is generally less processed than one with a paragraph of additives.
• Don’t be fooled by “natural” claims. Rosemary extract and ascorbic acid sound healthy and still showed up in the data. The marketing word “natural” tells you little about how processed a product is.
• Build the protective stuff in. Diets rich in potassium, fiber and nitrate from vegetables are independently good for blood pressure. Whole-food strategies — and even some popular approaches like intermittent fasting when it nudges people toward simpler home cooking — work partly by displacing ultra-processed food.
• Keep proven basics in view. No additive swap replaces the fundamentals: limiting added salt, staying active, and not over-relying on quick fixes. We took an honest look at one such trend in our review of what the evidence on apple cider vinegar actually shows — a useful reminder that the basics outperform shortcuts.

Frequently Asked Questions

Which food preservatives are bad for your heart?

The 2026 NutriNet-Santé study linked eight preservatives to higher blood-pressure risk: sodium nitrite (E250), potassium sorbate (E202), potassium metabisulphite (E224), citric acid (E330), ascorbic acid (E300), sodium ascorbate (E301), sodium erythorbate (E316) and rosemary extract (E392). Ascorbic acid was also tied to cardiovascular disease. “Linked” means associated in an observational study, not proven to cause harm.

Are all preservatives harmful?

No. Preservatives serve a genuine purpose — preventing dangerous bacterial growth and food spoilage — and most are considered safe by regulators at approved levels. The study found associations with specific additives in the context of high overall intake; it did not show that any single preservative is acutely dangerous. The bigger signal is heavy reliance on ultra-processed food overall.

What foods contain these preservatives?

They are most concentrated in processed and cured meats (bacon, ham, hot dogs, deli meats), soft drinks, packaged baked goods, candy, dried fruit, wine, sauces, dips and ready meals. In the study, 99.5% of participants had consumed at least one preservative additive within two years, showing how widespread they are.

Does this study prove preservatives cause heart disease?

No. It is an observational cohort study, which can show that higher preservative intake is associated with higher rates of high blood pressure and heart disease but cannot prove the additives directly cause those outcomes. Confounding from overall diet and lifestyle, plus the bundling of additives with ultra-processed food, means the results should be read as a meaningful signal, not proof.

Is the ascorbic acid (vitamin C) in food bad for me?

The vitamin C in whole fruits and vegetables is beneficial. The study’s link was to ascorbic acid used as an industrial additive (E300), which most often appears in processed products. The likeliest explanation is that E300 acts as a marker of heavily processed food rather than being harmful itself. There is no reason to avoid vitamin C from real food.

How can I avoid harmful preservatives?

Cook more meals from whole ingredients, prioritize cutting back on processed and cured meats, favor products with short ingredient lists, and don’t assume “natural” labels mean low-processed. Loading your plate with potassium- and fiber-rich vegetables also supports healthy blood pressure independently of additive intake.

How strong is the evidence linking additives to heart problems?

It is consistent and growing but not definitive. Earlier NutriNet-Santé analyses linked additive nitrites and certain emulsifiers to higher hypertension and cardiovascular risk, and broader research ties ultra-processed food to a roughly 12% higher cardiovascular risk per 10% increase in the diet. Several studies pointing the same direction strengthen the case, but observational data still cannot establish cause and effect.

Should I throw out everything with preservatives?

No — that’s neither practical nor supported by the evidence. The realistic goal is to lower how much of your diet comes from heavily preserved, ultra-processed products, not to achieve a zero-additive pantry. Modest, sustainable shifts toward whole foods deliver most of the likely benefit.

The Bottom Line

A rigorous 2026 study of over 112,000 people found that the preservatives in everyday packaged foods were associated with a 29% higher risk of high blood pressure and a 16% higher risk of cardiovascular disease among the heaviest consumers — with eight specific additives, led by sodium nitrite, standing out. That is a genuinely useful addition to what we know, and it reinforces the case for eating fewer ultra-processed foods, especially cured and processed meats.

But the honest interpretation matters as much as the headline. This is observational research: it shows a link, not proof of cause, and the additives may partly be markers of a broader processed-food pattern rather than direct villains. The right response is not fear of every ingredient label, but a steady shift toward simpler, whole-food eating — a change that helps your blood pressure for many reasons beyond preservatives. If you take one action from this study, make it the easiest high-value one: eat less processed meat, and cook a little more from scratch.

Sources

1. Hasenböhler A, Touvier M, et al. “Preservative food additives, hypertension, and cardiovascular diseases: the NutriNet-Santé study,” European Heart Journal, 2026. https://academic.oup.com/eurheartj/advance-article/doi/10.1093/eurheartj/ehag308/8679203
2. European Society of Cardiology. “Common food preservatives linked to high blood pressure and heart disease” (press release), 2026. https://www.escardio.org/news/press/press-releases/common-food-preservatives-linked-to-high-blood-pressure-and-heart-disease/
3. Srour B, Chazelas E, Debras C, et al. “Nitrites and nitrates from additives and natural sources and risk of cardiovascular outcomes,” European Journal of Public Health, 2022. https://pmc.ncbi.nlm.nih.gov/articles/PMC9594060/
4. Sellem L, Srour B, Javaux G, et al. “Food additive emulsifiers and risk of cardiovascular disease in the NutriNet-Santé cohort: prospective cohort study,” The BMJ, 2023. https://pmc.ncbi.nlm.nih.gov/articles/PMC10480690/
5. Srour B, Fezeu LK, Kesse-Guyot E, et al. “Ultra-processed food intake and risk of cardiovascular disease: prospective cohort study (NutriNet-Santé),” The BMJ, 2019. https://www.bmj.com/content/365/bmj.l1451