You already know that too much salt is bad for your heart. But what about the dozens of other chemical preservatives hiding in plain sight on your ingredient labels the citric acids, sorbates, nitrites, and erythorbates that keep your food shelf-stable for weeks or months? A sweeping new study published in the European Heart Journal suggests these compounds warrant serious attention, and the findings should prompt anyone to reconsider their grocery habits.
A 15-Year Investigation into What Preservatives Actually Do to Your Heart
Researchers from France’s NutriNet-Santé cohort followed over 112,000 adults for an average of nearly 8 years, tracking their food intake in extraordinary detail. Rather than relying on vague dietary questionnaires, participants completed up to 96 detailed 24-hour dietary records that identified the specific brands of packaged foods they consumed. This mattered enormously, because the same type of food, say, a jar of tomato sauce, can contain wildly different preservatives depending on the brand.
The team then cross-referenced those brand-specific food records against multiple composition databases and lab analyses to calculate each participant’s precise, cumulative exposure to 58 individual preservative food additives over time. Outcomes were tracked using national health insurance data, validated medical records, and France’s national mortality registry.
By the end of the study, 5,544 participants had developed hypertension and 2,450 had experienced a major cardiovascular event, including strokes and coronary heart disease. After carefully adjusting for age, BMI, physical activity, smoking, diet quality, sodium intake, and many other potential confounders, the associations between preservative exposure and disease were clear and consistent.
Which Preservatives Were Linked to Higher Risk?
The study divided preservatives into two broad categories: non-antioxidant preservatives (which fight microbial spoilage) and antioxidant preservatives (which prevent oxidation and rancidity). Both categories were independently associated with elevated hypertension risk.
Higher consumers of total non-antioxidant preservatives had a 29% higher risk of developing hypertension and a 16% higher risk of cardiovascular disease compared to lower consumers. The antioxidant preservative group showed a 22% higher hypertension risk.
Eight specific preservatives remained significantly linked to hypertension even after correcting for multiple statistical tests:
- Potassium sorbate (E202), used widely in baked goods, beverages, and dairy products, was among the strongest signals, associated with a 39% higher hypertension risk. As a trans fatty acid salt, it mirrors the well-documented cardiovascular harms of industrial trans fats.
- Sodium nitrite (E250), the pink-curing agent in processed meats like bacon, ham, and hot dogs, was linked to a 16% higher hypertension risk. Nitrites are thought to promote oxidative stress in blood vessel cells and may impair insulin sensitivity.
- Citric acid (E330), one of the most ubiquitous additives, found in 91% of study participants’ diets, was associated with a striking 25% higher hypertension risk. It appears in everything from soft drinks and canned tomatoes to salad dressings and processed cheese.
- Ascorbic acid (E300) and sodium erythorbate (E316), both synthetic antioxidants commonly added to cured meats and fruit-based products, were each linked to roughly 14–15% higher risks of hypertension and cardiovascular disease.
- Potassium metabisulfite (E224), a sulfite preservative common in wine, dried fruits, and fruit juice, was associated with a 16% higher hypertension risk.
- Sodium ascorbate (E301) and rosemary extract (E392) rounded out the list of additives with significant associations with hypertension.
Importantly, about 16% of the relationship between non-antioxidant preservatives and cardiovascular disease was mediated by hypertension itself, suggesting that elevated blood pressure is one of the biological pathways linking these chemicals to heart events.
But Wait Aren’t Some of These “Natural”?
This is where the findings get genuinely surprising. Citric acid, ascorbic acid (vitamin C), and rosemary extract are all perceived as natural or even health-promoting ingredients. And indeed, consuming vitamin C through fruits and vegetables is consistently associated with lower cardiovascular risk in population-based studies.
But the researchers highlight a critical nuance: the food additive form of a compound is not the same as its naturally occurring counterpart. Factors such as the food matrix, dosage, and interactions with other additives and processing steps can all alter its biological effects. Getting vitamin C from an orange is a fundamentally different experience for your body than consuming synthetic ascorbic acid added to a meat product alongside nitrites, erythorbates, and phosphates.
What About Mechanisms?
The exact biological pathways are still being worked out, but laboratory research offers some clues. Potassium sorbate has been shown to activate compounds called advanced glycation end products, which are implicated in blood vessel damage and metabolic dysfunction. Sodium nitrite promotes oxidative stress in the cells lining blood vessels and may impair insulin signalling. Citric acid esters have been linked to enhanced cell proliferation in the liver — a relevant finding given the strong connections between liver health and cardiovascular risk.
The researchers also note that several of these preservatives appear to show a plateau effect in dose-response analyses, suggesting possible receptor saturation, a pattern seen with endocrine-disrupting compounds and some hormones.
Limitations Worth Knowing
This is an observational study, which means it cannot prove that preservatives cause hypertension or heart disease, only that they are associated with hypertension and heart disease after adjusting for a wide range of other factors. The cohort was predominantly female (79%) and more health-conscious than the average French population, which may limit the extent to which the findings generalize to other groups. Undiagnosed hypertension cases are also possible, though the multi-source tracking approach minimized this risk.
That said, the study’s scale, duration, methodological rigor, and consistency across sensitivity analyses make it the most comprehensive investigation of its kind to date.
What This Means for You
The researchers stop short of issuing individual dietary prescriptions, but their conclusions point in a clear direction: favor fresh and minimally processed foods over packaged industrial products wherever possible. This doesn’t mean avoiding all packaged food entirely, but it does reinforce why cooking from whole ingredients matters beyond just calories, sodium, and saturated fat.
The study also calls on food regulators to revisit the safety evaluations of widely used preservatives, most of which were assessed for toxicological endpoints like cancer risk and growth, not cardiovascular health. As the evidence base grows, the benefit-risk calculation for these additives may need to be recalibrated with the heart in mind.
For now, checking ingredient labels is more worthwhile than ever. The E-numbers you once scrolled past without a thought may warrant a second look.
References
Hasenböhler A, Javaux G, Payen de la Garanderie M, et al. Preservative food additives, hypertension, and cardiovascular diseases: the NutriNet-Santé study. European Heart Journal. 2026. https://doi.org/10.1093/eurheartj/ehag308