A Massive Study Just Flagged Something In Most People's Diets & It's Not Sodium Or Sugar

You've probably heard that processed foods aren't great for your heart. But a sweeping new study suggests the story goes deeper than sodium, saturated fat, or sugar.

Researchers found that specific preservative additives (the kind listed in fine print on thousands of packaged foods) were independently linked to higher rates of high blood pressure and cardiovascular disease over nearly eight years of follow-up.

What made this study stand out was how detailed it was. Rather than broadly labeling foods as "ultra-processed," researchers tracked exposure to 58 individual preservative additives using brand-specific food records collected over up to 15 years.

Participants were grouped into lower, medium, and higher consumers of preservative food additives.

Those with the highest intake of total non-antioxidant preservatives (the kind that don't function as antioxidants) had a 16% higher risk of CVD and a 26% higher risk of coronary heart disease compared to those with the lowest intake.

Higher intake of total preservatives overall was associated with a 24% higher risk of high blood pressure.

These associations held up after adjusting for age, BMI, physical activity, smoking, sodium intake, saturated fat, sugar, fruit and vegetable intake, and ultra-processed food consumption, suggesting the preservatives themselves, not just the broader dietary pattern, may be contributing to the observed risk.

The study also found that about 16% of the link between non-antioxidant preservative exposure and CVD was explained by high blood pressure, and about 5% was explained by type 2 diabetes, pointing to plausible biological pathways.

These additives are far more widespread than many people realize.

According to the study, more than 20% of industrial foods and drinks on a major global food database contained at least one preservative additive as of 2024.

In fact, 99.5% of participants had a non-zero intake of preservative food additives, meaning virtually everyone was consuming them regularly.

One of the more interesting findings involves additives that are chemically identical, or nearly identical, to nutrients found naturally in whole foods.

Take ascorbic acid. As a food additive (E300), it's the same molecule as vitamin C. Yet research has consistently found that getting more vitamin C naturally from fruits and vegetables is linked to lower cardiovascular risk. So why would the additive form show the opposite pattern?

The researchers point to a few possible explanations. When you eat vitamin C in a piece of fruit, it comes packaged with fiber, plant compounds, and other nutrients that affect how your body absorbs and uses it.

An isolated additive in a processed product doesn't carry those same co-factors. Dosage and absorption also differ, as do interactions with other ingredients.

Even when a food additive has the same chemical structure as a naturally occurring nutrient, its effects can differ based on the food it's in, the dose, and how it interacts with other compounds.

A similar distinction applies to nitrates and nitrites. Nitrates found naturally in vegetables like beets, spinach, and arugula have been linked to cardiovascular benefits in some research.

Nitrites used as preservatives in processed meats, by contrast, interact with proteins during meat processing to form N-nitroso compounds—themselves a risk factor for insulin resistance, which in turn raises the risk of both high blood pressure and CVD over time.

This is an observational study, which means it can identify associations but cannot prove that preservatives directly cause cardiovascular disease or high blood pressure. There's always a chance that other unmeasured factors played a role, though the models were adjusted for a wide range of potential confounders and remained consistent across multiple sensitivity analyses.

The cohort was also not fully representative of the general population: participants were more likely to be women, more highly educated, and to have healthier baseline lifestyles than average. That said, for this type of research, what matters most is having a wide range of exposure levels across participants, which NutriNet-Santé did capture.

The researchers are clear that these findings don't contradict existing dietary guidelines. Rather, they add a new layer: it may matter not just whether you're eating enough produce and limiting red meat, but also which additives are accumulating across the foods you eat every day. More experimental research is needed to understand the mechanisms before any regulatory conclusions can be drawn.

The goal here isn't to make you afraid of your pantry. But if you're looking to support your heart health beyond the standard advice, reducing your overall preservative intake is a reasonable place to focus.

Prioritizing anti-inflammatory whole foods and starting your day with heart-protective breakfast choices are practical strategies that align with what this research points toward.

A large study tracking over 112,000 adults for nearly eight years found that higher intake of widely used food preservatives (including nitrites, sulphites, sorbates, and citric acid) was linked to meaningfully higher rates of high blood pressure and cardiovascular disease, even after adjusting for sodium, diet quality, and ultra-processed food intake.