What’s Really in Your Packaged Foods? New Research Raises Blood Pressure Concerns

We already know that eating too much sodium can contribute to high blood pressure. But new research suggests there may be another ingredient worth paying attention to in packaged foods: preservatives.

A large study involving more than 112,000 adults found that higher consumption of several commonly used food preservatives was associated with a greater risk of developing high blood pressure. And some of the ingredients researchers identified may surprise you, including vitamin C and rosemary extract when used as food additives.

What the Research Found

In a 2026 study published in the European Heart Journal, researchers analyzed dietary records from 112,395 adults participating in France’s long-running NutriNet-Santé study.

Participants provided detailed information about the foods and beverages they consumed, including specific brands, allowing researchers to estimate their exposure to dozens of preservative additives over time.

After a median follow-up of nearly eight years, researchers identified 5,544 new cases of hypertension (high blood pressure).

People with the highest consumption of non-antioxidant preservatives had a 29% higher incidence of hypertension compared with those consuming the least. Higher overall exposure to these preservatives was also associated with a 16% greater incidence of cardiovascular disease.

Of the 17 individual preservative additives commonly consumed by participants, eight were significantly associated with a higher incidence of hypertension after researchers accounted for multiple statistical comparisons.

One important distinction: this was an observational study, so it doesn’t prove the preservatives themselves caused high blood pressure. Other dietary and lifestyle factors may contribute to the relationship, and researchers say additional studies are needed to understand the potential mechanisms.

Still, the findings raise questions about ingredients that appear in a wide range of everyday packaged foods.

Which Preservatives Were Linked to Higher Blood Pressure?

Some of the additives identified in the research will look familiar if you’ve ever checked the back of a food package. Others might not immediately register as preservatives.

The eight individual additives associated with hypertension were:

• Potassium sorbate: Used to help prevent mold and yeast growth in products such as cheese, baked goods, and certain beverages.
• Potassium metabisulfite: A sulfite preservative used in products such as wine and some dried fruits.
• Sodium nitrite: Commonly used in cured meats, including bacon, ham, and hot dogs.
• Ascorbic acid: Also known as vitamin C, it can be added to packaged foods to help prevent oxidation.
• Sodium ascorbate: Another form of vitamin C used for its antioxidant and preservative properties.
• Sodium erythorbate: Frequently used in processed meats to help preserve color and quality.
• Citric acid: Used in a wide range of packaged foods and drinks, including beverages, sauces, and canned products.
• Rosemary extract: A plant-derived antioxidant sometimes added to foods to help prevent fats and oils from deteriorating.

The vitamin C and rosemary findings are particularly interesting because these ingredients are often associated with health benefits.

But the study examined exposure to specific substances when used as food additives. It doesn’t mean that eating vitamin C-rich fruits or cooking with rosemary raises blood pressure, and the results shouldn’t be interpreted that way.

What This Means for Your Grocery Cart

You don’t need to memorize eight ingredient names or eliminate every packaged food from your kitchen. The research is still developing, and preservatives serve important purposes, including preventing spoilage and extending shelf life.

But if you’re interested in reducing your exposure, there are a few easy places to start.

Take a Closer Look at Processed Meats

Bacon, hot dogs, ham, and some packaged deli meats commonly contain preservatives such as sodium nitrite and sodium erythorbate.

If these foods are part of your regular routine, consider alternating them with freshly cooked chicken, turkey, eggs, hummus, or other minimally processed proteins.

And don’t automatically assume a product labeled uncured is preservative-free. Some use celery powder or juice as an alternative curing ingredient, which can still contribute nitrates or nitrites.

Compare Packaged Foods Before Buying

Two similar products can have very different ingredient lists.

When shopping for sauces, dressings, baked goods, or packaged snacks, take a quick look at the ingredients and compare your options. You may find a version with fewer preservative additives without having to change what you’re eating.

This doesn’t mean the shortest ingredient list is automatically the healthiest. It’s simply another piece of information to consider alongside sodium, fiber, added sugar, and overall nutritional quality.

Choose Unsulfured Dried Fruit

Some dried fruits, particularly apricots, contain sulfites to help preserve their color and appearance.

If dried fruit is something you eat regularly, look for unsulfured varieties. They’re often darker in color, but they can be just as useful for snacking, oatmeal, yogurt, and homemade trail mix.

Make More Room for Minimally Processed Foods

Fresh and frozen vegetables, plain beans, lentils, whole grains, nuts, and minimally processed proteins can help reduce your reliance on foods containing multiple preservative additives.

You don’t have to cook everything from scratch, either. Frozen produce, canned beans, plain yogurt, and other convenient staples can make eating well easier without requiring a pantry full of specialty ingredients.

Should You Be Worried About Preservatives?

The findings deserve attention, especially because high blood pressure is such an important risk factor for heart disease and stroke. But they aren’t a reason to panic over a particular ingredient or throw out everything in your pantry.

This study identified associations, not proof of harm, and researchers still need to determine whether the additives themselves contribute to cardiovascular risk or whether other factors help explain the findings.

For now, the most useful approach is to look at your overall eating pattern. If packaged meats, shelf-stable snacks, and heavily preserved foods make up a large portion of your diet, incorporating more minimally processed alternatives is a reasonable change.

And if blood pressure is your main concern, don’t lose sight of the strategies supported by much stronger evidence, including managing sodium intake, eating potassium-rich foods, staying physically active, and following a DASH-style eating pattern.

Preservatives may eventually become another important piece of the cardiovascular health conversation. This research gives scientists a reason to investigate further, and consumers a reason to pay a little more attention to what’s in their everyday foods.