French Study Links Common Food Preservatives to Higher Cancer Risks

A new French study has raised concerns about the safety of certain food preservatives. Researchers from the NutriNet-Santé project found possible links between sodium nitrite, potassium sorbate, and higher risks of prostate and breast cancer. The findings have reignited debates over the long-term effects of additives in processed foods.

The study tracked dietary habits and health outcomes over time. It suggested that regular intake of sodium nitrite—common in processed meats—could increase prostate cancer risk. Potassium sorbate, often used in soft drinks and snacks, was associated with a higher likelihood of breast cancer. The team also noted a potential connection between some preservatives and type 2 diabetes.

Critics, however, question whether the study can isolate the effects of additives from other unhealthy aspects of processed foods. The European Food Safety Authority (EFSA) maintains that current intake limits for these substances remain safe. Around 320 additives are approved in the EU, though organic products use far fewer—about 40—each with strict usage caps.

The debate isn't new. Titanium dioxide, once widely used as a whitening agent, was banned in 2021 after evidence suggested possible DNA damage. Other substances, like excessive phosphates, have faced scrutiny for potential kidney harm, while certain artificial colourings may trigger allergic reactions. Despite these concerns, the EFSA continues to review additives case by case.

Processed foods now make up a significant portion of diets, accounting for roughly a third to half of daily calories. Items like frozen pizzas, sausages, and sugary drinks are commonplace. While the French study doesn't prove causation, researchers argue that a broader reassessment of food additives may be necessary.

The study highlights ongoing uncertainty about the long-term safety of certain preservatives. Regulators like the EFSA still consider approved additives safe within set limits. However, the findings could prompt further reviews of how these substances are evaluated and monitored in the food supply.