Common food preservatives, the ubiquitous ingredients that line the shelves of modern grocery stores, may carry hidden risks for long-term heart health. According to a significant new study published in the European Heart Journal, the regular consumption of these additives—found in the vast majority of the industrially processed food supply—is associated with a heightened risk of developing high blood pressure and cardiovascular disease.
The research was spearheaded by Dr. Mathilde Touvier, a research director at INSERM (the French National Institute for Health and Medical Research), and Anaïs Hasenböhler, a PhD student, both of whom serve on the Nutritional Epidemiology Research Team at the Université Sorbonne Paris Nord and Université Paris Cité in France. Their findings provide some of the most comprehensive evidence to date regarding how these chemical agents, designed to prolong shelf life, might influence human physiology over time.
The Ubiquity of Food Preservation
In the modern food landscape, preservatives perform a vital technical role. They are added to products to prevent the growth of harmful bacteria and mold, inhibit spoilage, and maintain the aesthetic and sensory qualities—such as vibrant color, freshness, and texture—that consumers have come to expect. Despite their widespread use, the long-term impact of chronic exposure to these additives on cardiovascular health has remained largely opaque until now.
"Food preservatives are used in hundreds of thousands of industrially processed foods," noted Ms. Hasenböhler. "Experimental studies suggest that some preservative food additives may be harmful to cardiovascular health, but we have not had enough evidence on the impact of these ingredients in humans. As far as we know, this is the first study of its kind to investigate the links between a wide range of preservatives and cardiovascular health."
Tracking Diet and Heart Health in More Than 112,000 People
To investigate these potential links, the research team utilized data from the NutriNet-Santé project, a large-scale, ongoing research initiative designed to map the complex intersections between nutrition and long-term health outcomes. The study’s scale was significant, encompassing 112,395 volunteers living across France.
The methodology relied on a rigorous reporting process. Every six months, participants were required to log every item they consumed over a three-day period. This approach provided the research team with an unusually high level of granular detail, offering a far more accurate picture of dietary habits than the broad, retrospective estimates often found in nutritional studies.
By cross-referencing these logs with the ingredient lists of the foods and beverages consumed, the researchers were able to quantify the participants’ exposure to various preservatives. These individuals were then followed for an average of seven to eight years, allowing the team to document the development of hypertension, as well as more severe cardiovascular events, including heart attacks, strokes, and angina.
The ubiquity of these substances was striking. Within just the first two years of the study, 99.5% of the volunteers had consumed at least one food preservative, underscoring just how deeply embedded these additives are in the standard modern diet.
Higher Preservative Intake Linked to Higher Risk
The study’s analysis revealed that the strongest associations between additive consumption and poor heart health were found among those with the highest levels of intake. Specifically, participants who consumed the largest quantities of "non-antioxidant" preservatives faced a 29% higher risk of hypertension compared to those who consumed the lowest amounts. Furthermore, these individuals exhibited a 16% higher risk of cardiovascular disease, a category that included heart attack, stroke, and angina.
The researchers also noted that those who consumed the greatest amounts of antioxidant preservatives faced a 22% higher risk of hypertension.
These two categories of additives protect food in fundamentally different ways. Non-antioxidant preservatives are primarily employed to stave off microbial threats, such as bacteria and mold, that can cause foodborne illness or rapid decay. Conversely, antioxidant preservatives are designed to slow the chemical process of oxidation, which is responsible for the browning of produce, the development of rancid flavors, and the general degradation of food quality over time.
Eight Common Preservatives Stood Out
In a deeper dive into the specific substances consumed by the participants, the researchers isolated 17 common preservatives. Out of these, eight were specifically identified as being associated with an increased risk of high blood pressure: potassium sorbate (E202), potassium metabisulphite (E224), sodium nitrite (E250), ascorbic acid (E300), sodium ascorbate (E301), sodium erythorbate (E316), citric acid (E330), and extracts of rosemary (E392).
Of these eight, ascorbic acid (E300) was also specifically linked to a higher risk of cardiovascular disease.
While these findings are significant, the researchers were careful to qualify the nature of the data. The study is observational, meaning it identifies statistical correlations rather than establishing a direct causal link. Consumption of these additives does not definitively cause heart disease, but rather, the data highlights a concerning pattern that warrants further investigation.
Dr. Touvier addressed these constraints, noting: "This study has some limitations inherent to its observational design. However, the findings are based on highly detailed data, and we have taken account of other factors that can increase or lower the risk of cardiovascular disease."
She added that the findings align with existing experimental literature, which has consistently suggested that certain preservatives may induce oxidative stress in the body or potentially disrupt the function of the pancreas. "These results suggest we need a re-evaluation of the risks and benefits of these food additives by the authorities in charge, such as the EFSA in Europe and the FDA in the USA, for better consumer protection," she stated. "In the meantime, these findings support existing recommendations to favor non-processed and minimally processed foods, and avoid unnecessary additives. Doctors and other healthcare professionals play a key role in explaining these recommendations to the public."
Why Preservatives Might Affect the Body
The biological mechanisms behind these observed risks remain a primary focus of ongoing research. One prevailing theory centers on oxidative stress—a condition occurring when reactive molecules accumulate in the body faster than its defense systems can neutralize them. Over time, this imbalance can lead to chronic cellular and tissue damage, contributing to the development of cardiovascular conditions.
Another area of investigation involves the potential for these preservatives to influence pancreatic function. Because the pancreas is a central organ in the regulation of blood sugar and metabolism, any interference with its function could have systemic effects throughout the body.
Moving forward, the team is expanding their scope to analyze how food additives and ultra-processed foods interact with broader physiological markers, including systemic inflammation, the metabolic profile of the blood, and the gut microbiota. The gut microbiota, a vast community of microorganisms inhabiting the digestive tract, is increasingly recognized for its influence on human health, playing vital roles in metabolism, immune system regulation, and cardiovascular maintenance. By investigating these biological pathways, the researchers hope to determine whether these preservatives are active contributors to the disease risks identified in the current study, providing a clearer roadmap for future public health policy and individual dietary choices.
