What we've considered safe may warrant a second look
Across more than a hundred thousand lives tracked over time, French researchers have uncovered a quiet arithmetic at work in the modern diet — one in which the colorants and preservatives woven into processed foods appear to compound the risk of diabetes, hypertension, and cancer in measurable, troubling ways. Published across three peer-reviewed journals and rooted in one of Europe's largest nutritional cohorts, the findings do not indict any single ingredient so much as they raise a broader question about what societies have quietly agreed to accept as safe. The science is epidemiological, not yet causal, but its scale lends it a weight that is difficult to set aside.
- Researchers found that heavy consumers of food colorants faced a 38% greater risk of type 2 diabetes and a 14% higher overall cancer risk — numbers that are hard to dismiss as statistical noise.
- Two additives drew particular alarm: curcumin (E100) was tied to a 49% rise in diabetes risk, and potassium sorbate (E202) to a 39% increase in hypertension risk, despite both being widely approved and used.
- The sheer scale of exposure is unsettling — over 139,000 commercial products contain at least one food colorant, and more than 700,000 include preservatives, meaning avoidance requires deliberate, sustained effort.
- Scientists are calling on health authorities to formally reassess the safety profiles of currently approved additives, arguing that regulatory frameworks have not kept pace with large-scale human evidence.
- The practical guidance emerging from the research is straightforward but structurally difficult: shift toward fresh and minimally processed foods in food environments engineered to make that choice inconvenient.
Three studies emerging from France's NutriNet-Santé initiative have drawn a disquieting line between everyday food additives and some of the most prevalent chronic diseases of our time. Tracking more than 100,000 participants and drawing on the Open Food Facts ingredient database, researchers from leading French institutions published their findings in Diabetes Care, the European Journal of Epidemiology, and the European Heart Journal.
The diabetes findings were among the most striking. Those with the highest intake of food colorants were 38% more likely to develop type 2 diabetes than those with the lowest exposure. Caramel coloring (E150a) and curcumin (E100) were singled out, associated with 46% and 49% increases in risk respectively. On the cancer front, high colorant consumption correlated with a 14% rise in overall cancer risk and a 21% increase in breast cancer risk — climbing to 32% among postmenopausal women.
Preservatives told a parallel story. High exposure was linked to a 24% greater risk of hypertension, with potassium sorbate (E202) — a mold and yeast inhibitor found across the food supply — tied to a 39% increase in high blood pressure risk.
The researchers describe these as the first large-scale epidemiological studies to examine this range of additives alongside these specific diseases, and note that their results align with prior laboratory and animal research. Their conclusion carries a quiet urgency: regulatory bodies should revisit the safety assumptions underpinning additive approvals, and individuals would do well to favor fresh, minimally processed foods wherever possible. What has long been deemed market-safe, they suggest, may deserve a more searching second look.
Three separate studies conducted by French researchers have found a troubling connection between certain food additives and the development of serious chronic diseases. The work, carried out under the NutriNet-Santé public health initiative, tracked more than 100,000 participants and examined how specific colorants and preservatives in processed foods correlate with increased risk of type 2 diabetes, high blood pressure, heart disease, and several forms of cancer.
The research teams—drawn from France's National Institute of Health and Medical Research, the National Institute for Agricultural and Environmental Research, and three major universities—published their findings across three peer-reviewed journals: Diabetes Care, the European Journal of Epidemiology, and the European Heart Journal. What makes this work significant is its scale and scope. The researchers analyzed data from the Open Food Facts database, a collaborative repository that catalogues the ingredients in commercial products. They found that more than 139,000 food and beverage products contain at least one food colorant, while over 700,000 include preservatives.
The numbers are striking. People who consumed the highest amounts of food colorants showed a 38 percent greater risk of developing type 2 diabetes compared to those with the lowest exposure. Two colorants in particular stood out: caramel coloring, commonly labeled E150a, was linked to a 46 percent increase in diabetes risk, while curcumin, labeled E100, showed a 49 percent elevation. The cancer findings were equally concerning. High consumption of colorants correlated with a 14 percent increase in overall cancer risk, a 21 percent increase in breast cancer risk, and a 32 percent increase in breast cancer risk specifically among postmenopausal women.
Preservatives presented their own set of problems. Participants with the highest exposure to preservatives had a 24 percent higher risk of developing hypertension. Potassium sorbate, labeled E202 and widely used by food manufacturers to prevent mold, yeast, and fungal growth, was associated with a 39 percent increase in high blood pressure risk.
The researchers emphasize that these are the first large-scale epidemiological studies to examine such a broad range of food additives in connection with these specific diseases. Their findings align with earlier experimental work conducted in laboratory and animal models, lending credibility to the associations they've identified. The scientists argue that their results underscore an urgent need for health authorities to reconsider the safety profiles of certain additives currently approved for use. They recommend that consumers reduce their intake of ultra-processed foods and instead prioritize fresh or minimally processed options. The implication is clear: what we've long considered safe enough for the market may warrant a second look.
Notable Quotes
These are the first large-scale epidemiological studies to examine such a broad range of food additives in connection with these specific diseases— French research teams (Inserm, INRAE, and partner institutions)
Results reinforce the need for health authorities to reassess the safety of certain food additives and recommend reducing consumption of ultra-processed foods— Study researchers
The Hearth Conversation Another angle on the story
Why does this study matter more than the dozens of other food safety warnings we hear each year?
Because it's the first time researchers have tracked this many people over time while measuring actual consumption of specific additives against disease outcomes. It's not a lab experiment or a theoretical model—it's real people, real food, real illness.
But aren't these additives already approved by regulators?
They are. That's the point. The approval process was based on older science and smaller studies. This work suggests the bar for safety may have been set too low, or that we didn't understand the cumulative effect of eating multiple additives across many products every single day.
The risk increases seem modest—38 percent for diabetes, 14 percent for cancer overall. Isn't that within normal variation?
It depends on your perspective. If you're one of the millions eating processed food daily, a 38 percent increase in your personal risk is not modest. And these aren't small populations—we're talking about hundreds of thousands of people whose disease burden could shift if exposure changed.
What's the practical takeaway for someone reading this at breakfast?
Look at the ingredient list. If you see E150a, E100, E202—or any additive you don't recognize—that's a signal to consider what you're actually eating. The researchers aren't saying one meal matters. They're saying the pattern over months and years does.
Will this change food regulation?
That's the open question. The researchers are calling for a reassessment, but regulatory agencies move slowly. What might change faster is consumer awareness—and that's often what forces industry to reformulate.