Food preservatives and heart disease: what a 112,000-person study found

A major French study tracked what 112,000 people ate over seven years and found a clear link between common food preservatives and higher rates of high blood pressure, heart attacks, and stroke. The findings raise real questions about what we're actually consuming when we reach for packaged food.

Key Takeaway: A 2026 study of 112,000 adults found that regular exposure to common food preservatives was linked to a 29% higher risk of hypertension and a 16% higher risk of cardiovascular disease.

What the research actually found

The NutriNet-Santé study, published in the European Heart Journal in May 2026, examined 58 different food preservatives. Researchers asked participants to track every bite they ate — by brand — for three days every six months. Then they compared that data with medical records from France's national healthcare system over seven to eight years.

Out of 17 preservatives consumed by at least 10% of participants, eight were tied to elevated blood pressure. The non-antioxidant preservatives (those that stop bacterial growth) were associated with a 29% greater risk of hypertension and a 16% higher risk of cardiovascular events like heart attacks and strokes.

Stat: 99.5% of participants had consumed at least one food preservative during the first two years of the study.

The "natural" preservatives aren't off the hook

Here's the part that caught a lot of people off guard: the so-called natural antioxidant preservatives — including citric acid and ascorbic acid, the latter being a form of vitamin C — were also tied to higher cardiovascular risk. People who consumed the most of these showed a 22% higher risk of hypertension.

The researchers are careful to point out that this is not the same as saying vitamin C in fruits is bad for you. "Naturally occurring ascorbic acid and added ascorbic acid — which may be chemically manufactured — may have different impacts on health," said senior author Mathilde Touvier, director of research at France's National Institute of Health and Medical Research (INSERM).

The distinction matters. A glass of orange juice and a processed snack both contain ascorbic acid on the label, but what that means for your body may be quite different.

Key Takeaway: When vitamin C appears as an ingredient in a processed food, it's acting as a preservative — not the same as vitamin C found naturally in whole fruit.

Why this matters beyond ultra-processed foods

Most of the conversation around food additives focuses on ultra-processed foods, and rightly so. But this study found something worth noting: preservatives aren't just in UPFs. Only about 35% of the preserved foods people consumed in this study were ultra-processed. That means preservative exposure was coming from a much wider range of products, including things people might consider relatively wholesome.

"There is no food group to remove from the diet in order to fix things," noted lead author Anaïs Hasenböhler, a doctoral student on the NutriNet-Santé team. The takeaway, she suggests, is to shift toward less processed options where possible — fresh, frozen (without additives), and minimally processed foods.

This aligns with what other research has shown. A large Nature Medicine study found that what you eat shapes 92% of your gut microbiome — and ultra-processed foods leave a particularly damaging microbial fingerprint.

What this means in practice

The eight specific preservatives flagged in the study are:

• Nisin (E234) — found in processed cheeses and some dairy products
• Potassium sorbate (E202) — used in baked goods, cheese, wine
• Calcium sorbate (E203) — similar applications to potassium sorbate
• Sodium nitrate (E251) and sodium nitrite (E250) — common in cured meats
• Citric acid (E330) — extremely widespread, used in drinks, packaged foods, canned goods
• Ascorbic acid (E300) — added to many packaged products as an antioxidant preservative

Looking at ingredient labels takes on new meaning here. You don't need to eliminate packaged food entirely — that's not realistic for most people — but paying attention to how many preserved products make up your daily diet is worth doing.

If reducing preservative exposure is a goal, a few practical shifts tend to help: buying fresh over packaged when the price difference is small, choosing frozen vegetables over canned (frozen typically uses cold as the preservative, not additives), and cooking more meals at home where you control the ingredients.

This also connects to what earlier research on blood pressure and diet keeps finding: small, consistent dietary shifts compound over time. One swap doesn't change your cardiovascular risk. But a pattern of eating closer to whole foods might.

Key Takeaway: Reducing preserved food intake doesn't require a complete diet overhaul. Choosing fresh or frozen options over canned and packaged, and checking labels for E-number preservatives, may help lower cumulative exposure.

The limits of this research

This study is observational — it shows an association, not causation. People who eat more preserved foods may also have other habits that affect cardiovascular health: less sleep, more sedentary time, higher stress. The researchers tried to account for these factors, but no observational study can fully eliminate them.

Also, the NutriNet-Santé cohort is French and predominantly female and educated. Findings may not apply equally across different populations and food systems. Replication in other cohorts would strengthen the conclusions.

That said, the scale of this study — over 112,000 people tracked for up to eight years — gives it more statistical weight than most dietary research. And the signal on preservatives was consistent enough across multiple substances to be taken seriously.

The bigger picture

What's useful about this research is that it shifts the conversation from macro-level warnings about "ultra-processed food" to something more specific and actionable. Knowing that it's not just the sugar or the salt in packaged products, but also the preservation chemistry, gives people a more precise target.

Most people are already under-eating fiber, which means the baseline diet in many countries is already skewed toward processed options. If preservatives are an additional cardiovascular variable on top of that, it's one more reason to think about what's actually in the food we buy — not just the macros on the front of the package.

Reading ingredient lists has historically felt like homework. But when a study of 112,000 people tells you that E300 added to your packaged bread is behaving differently than vitamin C in a kiwi, it becomes a bit more relevant.

-- Selena

Sources

• High blood pressure, heart attacks linked to common preservatives in food — CNN
• Study Warns Widely Used Food Preservatives Linked to High Blood Pressure and Heart Disease — SciTechDaily
• NutriNet-Santé study, Hasenböhler A., Touvier M. et al., European Heart Journal, May 2026

FAQ

Are food preservatives dangerous?

Based on current research, high regular exposure to certain preservatives — particularly nitrates, sorbates, and some antioxidant additives — has been associated with higher rates of hypertension and cardiovascular disease in large observational studies. This does not mean occasional consumption is dangerous, but cumulative daily exposure may be a factor worth watching.

Is vitamin C in packaged food the same as vitamin C in fruit?

According to researchers in the NutriNet-Santé study, added ascorbic acid (vitamin C used as a preservative) may behave differently in the body than naturally occurring ascorbic acid in whole fruits. The chemical structure may be similar, but the context, dose, and interactions with other additives likely differ.

What food preservatives were flagged in this study?

The eight preservatives associated with elevated cardiovascular risk in this study were: nisin (E234), potassium sorbate (E202), calcium sorbate (E203), sodium nitrate (E251), sodium nitrite (E250), citric acid (E330), and ascorbic acid (E300). These are found in a wide range of packaged foods, not just ultra-processed items.

How can I reduce my exposure to food preservatives?

Choosing fresh or frozen vegetables over canned, cooking from scratch more often, and checking ingredient labels for E-numbers are practical first steps. The researchers specifically recommended favoring non- to minimally-processed foods and frozen options preserved through temperature rather than additives.

Does this mean I should avoid all packaged foods?

No, and the researchers didn't suggest that either. The concern is cumulative exposure over time. Shifting the balance of your diet toward more whole, minimally processed foods tends to reduce preservative intake naturally, without requiring you to eliminate packaged products entirely.