Common Food Preservatives Raise Hypertension Risk by 29%, Major Study Finds

A team of French researchers has tied routine exposure to preservative food additives, the compounds that keep packaged foods shelf-stable, to meaningful increases in the risk of high blood pressure and cardiovascular disease. The findings, published in the European Heart Journal, come from one of the largest and most detailed diet-tracking efforts ever run, and they add a specific, quantified concern to a debate that had previously relied almost entirely on animal and cell studies.

Non-antioxidant preservatives tied to 29% higher hypertension incidence

The headline number from the NutriNet-Santé study is striking: participants with higher intakes of total non-antioxidant preservatives had a 29% greater chance of developing hypertension than those with lower intakes. The same group showed a 16% higher risk of experiencing a cardiovascular disease event. Non-antioxidant preservatives are the additives designed to suppress microbial growth, blocking mold and bacteria from taking hold in processed foods. Among the 17 individual preservatives consumed by at least 10% of participants, eight were independently linked to elevated hypertension incidence. Total sorbates, which include potassium sorbate, showed the sharpest association, a 39% higher incidence of hypertension. Citric acid was linked to a 25% higher incidence, and sodium nitrite to a 16% higher incidence. Even antioxidant preservatives, those designed to prevent oxidation rather than microbial growth, were associated with a 22% higher hypertension risk. Ascorbic acid (E300, the additive form of vitamin C) was specifically linked to higher cardiovascular disease incidence, a result that may initially seem paradoxical given that vitamin C in whole foods is associated with better heart health. The researchers note that context matters: how a compound arrives in the body, as part of a whole food matrix or as an isolated additive, appears to influence its effects.

Hypertension and diabetes both mediate the cardiovascular risk

The cardiovascular findings are not simply a separate signal sitting alongside the hypertension findings: hypertension explains part of the pathway between preservative exposure and heart disease. Statisticially, hypertension mediated 16.2% of the association between total non-antioxidant preservative exposure and cardiovascular disease incidence, while type 2 diabetes mediated a further 4.7%. This matters for understanding how the risk accumulates. Persistent high blood pressure is one of the most established drivers of heart attacks and strokes, so a dietary pattern that nudges blood pressure upward could contribute to cardiovascular events years later. The broader picture is consistent with what a comprehensive review of ultra-processed food risks found across nearly 10 million participants: diets high in ultra-processed foods increase cardiovascular mortality risk by 50%. Preservative additives are a common feature of that food category, and the new data start to pin down specific chemical suspects within it.

How 112,000 participants tracked their diets over nearly eight years

The NutriNet-Santé cohort, launched in France in 2009, is unusual in its depth of dietary data. The 112,395 participants, 78.7% women with a mean age of 42.8 years, completed repeated 24-hour web-based dietary records, up to 96 records per person over a median follow-up of 7.9 years. Crucially, participants reported commercial brand names, allowing the research team to cross-reference actual product formulations against multiple composition databases and laboratory assays. That design means the additive exposure estimates are far more precise than what a standard food frequency questionnaire could achieve. During follow-up, 5,544 participants developed hypertension and 2,450 experienced a cardiovascular disease event. Researchers used multi-adjusted Cox proportional hazard models, controlling for macronutrient intake, fruit and vegetable consumption, alcohol, salt, meat products, and dairy. The associations held after all those adjustments.

Why this research cannot yet prove causation

The study's authors are clear on the boundaries of what their data can establish. As lead author Dr. Mathilde Touvier noted, "This study has some limitations inherent to its observational design." Because participants were not randomly assigned to consume or avoid any additive, it remains possible that unmeasured factors explain some portion of the observed links. People who eat more preservative-laden foods may differ from those who eat fewer in ways that are difficult to fully capture in a questionnaire, even a detailed one. This is a structural constraint of nutritional epidemiology that applies broadly: as a PMC review of observational study limitations explains, the lack of randomization makes it inherently challenging to rule out bias and confounding as alternative explanations. The NutriNet-Santé team is currently investigating how additives affect inflammation, oxidative stress, metabolic profile, and gut microbiota in follow-up experimental work. Identifying those biological mechanisms would substantially strengthen the causal case.

Regulatory re-evaluation now on the table

The research team is calling on the FDA and the European Food Safety Authority to reconsider the current approvals governing these additives. "If confirmed," Dr. Touvier wrote, "these new data call for the re-evaluation of regulations governing the use of these additives to improve consumer protection." The FDA already mandates rigorous data for establishing safe use conditions and commits to revisiting safety assessments as new evidence accumulates, so the pathway for a formal review exists. Whether this study triggers one depends on how regulators weigh observational evidence against the experimental data still being gathered. In the meantime, the findings reinforce existing dietary guidance: favor non-processed and minimally processed foods where possible, and treat unnecessary additives as a reason for caution rather than confidence.