Food Preservatives Tied to Higher Cancer Risk in Major Study

Researchers in France have found that people who eat more of certain preservatives in processed foods face a slightly higher chance of getting cancer. The study followed over 100,000 adults for years and looked at additives like potassium sorbate, sulfites, sodium nitrite, and potassium nitrate. These show ties to overall cancer as well as breast and prostate cancers. The work came out this week and builds on earlier lab tests that hinted at cell damage from some of these chemicals.

Background

Food preservatives keep items like meats, drinks, and ready meals fresh longer. They stop mold, bacteria, and spoilage. Companies add them to products on store shelves. Most people eat these without thinking twice because rules say they are safe in small amounts.

This new study comes from a big group called NutriNet-Santé. It started in 2009 and ran through 2023. Over 105,000 people joined, all cancer-free at the start. They ranged in age from 15 up, with most around 42 years old. About 79 percent were women. Each person filled out detailed food logs many times. They noted brands and amounts for 24 hours at a stretch. This went on for about 7.5 years on average.

The team split preservatives into two types. Non-antioxidants fight germs and slow rot. Antioxidants block oxygen damage. They checked 17 specific ones. Out of 4,226 cancers that happened during the study, 1,208 were breast, 508 prostate, 352 colorectal, and the rest other kinds.

Past lab work showed some preservatives can harm cells or DNA. But human proof was thin until now. This study fills that gap with real eating habits and health records.

Key Details

Most preservatives showed no cancer link. Total amounts across all types also had no tie. But a few stood out.

Non-Antioxidant Preservatives

Higher intake of non-antioxidants linked to a 16 percent jump in overall cancer risk compared to low eaters. Potassium sorbate showed a 14 percent rise in any cancer and 26 percent in breast cancer. Sulfites tied to 12 percent higher overall risk. Sodium nitrite and potassium nitrate appeared in more prostate cases.

Processed meats held most nitrites and nitrates. Drinks and dressings had sulfites. Fruits and veggies in packages carried sorbates.

Antioxidant Preservatives

These mostly showed no problem. But erythorbates and sodium erythorbate linked to higher cancer rates. Acetates raised overall cancer by 15 percent and breast by 25 percent. Acetic acid alone tied to 12 percent more overall cancer.

The study adjusted for things like age, weight, smoking, exercise, and family history. Still, it notes limits. People self-reported food. Not everyone got cancer checks the same way. The group had more women, which might skew breast cancer numbers.

"This study brings new insights for the future re-evaluation of the safety of these food additives by health agencies, considering the balance between benefit and risk for food preservation and cancer." – Study researchers

Numbers came from hazard ratios. For example, high non-antioxidant users had a hazard ratio of 1.16 for cancer, meaning 16 percent higher risk after tweaks.

What This Means

The findings do not prove preservatives cause cancer. They show a link in this group. More work needs to check if it holds in other places. Lab tests match the patterns, which adds weight.

Rules on these additives might change. Agencies could set lower limits or demand better labels. Food makers may switch to safer options or cut use. Global teams track things like salt and bad fats already. They could do the same here.

For now, health guides already say eat less processed meat and booze. Fresh foods avoid most preservatives. Almost everyone in the study ate some—99.7 percent over two years. Cutting back means picking whole items over packages.

The team from INSERM and INRAE leads this work. Mathilde Touvier, a top researcher there, said these are the first big human studies on preservatives and cancer.

"These are the first epidemiological studies in the world to quantify exposure to preservatives and the risk of developing cancer and diabetes," – Mathilde Touvier, INSERM research director

Other studies from the same group found links to diabetes too. High preservative eaters had 47 percent higher type 2 diabetes risk. Sweeteners and emulsifiers showed problems before.

France has a plan to cut ultra-processed foods. It aims to lower additives overall. But leaders paused it late last year.

People can check labels for E200 to E299 numbers. These mark preservatives. Picking fewer means reading lists at the store.

The study pushes for balance. Preservatives help food last and cut waste. But health risks matter if use goes too high. Regulators weigh both sides now.