Food additives keep food safe, but chronic exposure raises new health questions

A comprehensive review published on 16 October 2026 in the open-access journal Food Safety and Risk examines the double-edged role of food additives in the modern global food supply, arguing that the same compounds that protect consumers from acute foodborne illness may, under conditions of chronic daily exposure, contribute to metabolic disruption, systemic inflammation and gut microbiota disturbance. The review, led by Mikru Belachew and colleagues, synthesises peer-reviewed literature from 2000 to 2026 retrieved from Scopus, Web of Science, ScienceDirect, PubMed and Google Scholar, and frames its central tension bluntly: additives have unquestionable efficacy in reducing foodborne pathogens and chemical degradation, yet recent clinical and preclinical data link specific synthetic agents to chronic disease pathways.

The authors begin from a historical observation that is easy to forget in contemporary debates about ultra-processed foods. The original purpose of food additives was narrow and unambiguous: stop spoilage and prevent acute foodborne illness. The combination of synthetic antimicrobials, stabilisers and antioxidants, the review notes, has reduced worldwide outbreaks of deadly infections such as Clostridium botulinum and slowed lipid oxidation in high-fat commodities. Nitrites and nitrates remain essential in cured meats because they inhibit the germination of Clostridium botulinum spores, one of the most lethal contamination risks in the food system, while simultaneously stabilising myofibrillar proteins to produce the characteristic pink colour and cured flavour profile of those products.

What has changed, according to the review, is the pattern of exposure rather than the underlying chemistry. Ultra-processed foods now use additives not merely for basic safety but to artificially mimic freshness, alter texture and improve palatability across multi-year shelf lives. This systemic shift has decoupled additive exposure from occasional consumption: daily meals are now filled with complex combinations of man-made food chemicals. Concurrently, epidemiological data have increasingly correlated high ultra-processed food intake with a rise in non-communicable chronic diseases, including metabolic syndrome, inflammatory bowel diseases and neurodegenerative disorders. The review is careful to characterise these epidemiological findings as correlations, and its authors acknowledge that human data remain primarily limited to prospective observational cohorts, which show associations between additive consumption and health outcomes but cannot establish direct causation because of residual confounding from overall diet quality.

The scale of the modern additive landscape is considerable. According to figures cited in the review, the US Food and Drug Administration permits more than 3,000 additives in food for purposes of imparting or maintaining functional and sensory properties and extending shelf life. Antimicrobials, despite their central role in pathogen control, constitute only about 5 percent of all additives used in foods globally. Organic acids such as benzoates, sorbates and propionates are widely deployed in acidic matrices like beverages and baked goods; sodium benzoate, for example, converts to lipophilic benzoic acid in low-pH environments, crosses the microbial cell membrane and acidifies the cytoplasm, effectively halting yeast and mould replication. These mechanisms are well characterised, and the review treats the antimicrobial and antioxidant functions of additives as settled technology rather than contested science.

The health concerns the review catalogues are more provisional and more varied. Synthetic antioxidants such as butylated hydroxyanisole (BHA), butylated hydroxytoluene (BHT) and tertiary butyl hydroquinone (TBHQ) have raised safety concerns: high doses of BHA and BHT may be carcinogenic and could affect the endocrine system according to studies cited, and excessive consumption of TBHQ has been linked to negative effects on DNA and reproductive organs. In long-term bioassays, high concentrations of BHA and BHT have been shown to induce oxidative stress by triggering the synthesis of microsomal enzymes, altering cellular homeostatic pathways and exhibiting cancer-promotion tendencies. Sodium nitrite, the same compound that guards against botulism, can interact with secondary amines in the acidic environment of the stomach to produce N-nitroso compounds, or nitrosamines, a recognised genotoxic class of chemicals.

Some of the strongest regulatory action has followed from the accumulating evidence on titanium dioxide, a whitening agent common in food products. The European Food Safety Authority updated its safety assessment and concluded that genotoxicity, meaning DNA damage, could no longer be ruled out given the absorption of nano-sized particles. Following that risk assessment, the European Commission adopted Regulation (EU) 2022/63, enacting a total ban on titanium dioxide as a food additive across the European Union as of August 2022. The review also highlights that patients with inflammatory bowel disease may be particularly susceptible, because their compromised intestinal barrier integrity may increase titanium dioxide absorption and raise their vulnerability to additive-induced adverse effects. The authors note that while acute toxicity of approved additives is rigorously screened, contemporary research increasingly focuses on chronic, low-dose metabolic and immunological impacts that traditional toxicological models may overlook.

The gut emerges as the critical interface in the review’s synthesis of mechanisms. Emulsifiers such as carboxymethylcellulose and polysorbate-80 behave like detergents within the gastrointestinal tract, degrading the protective mucin layer that physically separates luminal bacteria from the intestinal epithelial lining. That erosion permits direct bacterial translocation and precipitates low-grade chronic intestinal inflammation resembling inflammatory bowel disease, findings established in in vitro gut epithelial models and animal studies. Non-nutritive sweeteners including saccharin and sucralose, though non-caloric, can selectively alter microbial taxa in ways that favour populations optimising energy harvest from the diet, which has paradoxically correlated with glucose intolerance and insulin resistance in clinical cohorts. A systematic review cited in the paper links artificial sweeteners including acesulfame K, aspartame, saccharin, sucralose, cyclamate and neotame to alterations in gut microbiota, though the authors stress that these findings rely largely on animal models and small human cohorts, and that further large-scale clinical studies are necessary to clarify physiological relevance in humans.

On artificial colours, the review reports that tartrazine and Allura Red have historically been flagged for potential hypersensitivity reactions, and that ongoing paediatric trials and behavioural models link artificial colour consumption to exacerbated hyperactive behaviours resembling ADHD symptoms, via suspected histamine release and zinc chelation mechanisms. The authors also identify what they consider the foundational flaw in the current regulatory architecture: the single-compound assessment paradigm. Regulatory toxicological profiles determine an Acceptable Daily Intake based on isolated chemical studies, yet a single processed meal can introduce a cocktail of five to fifteen unique emulsifiers, preservatives, colourants and flavour enhancers. The synergistic, cumulative toxicological impacts, often called the cocktail effect, remain entirely unmapped by standard regulatory risk matrices. The review contrasts the two dominant frameworks: the FDA operates under the Federal Food, Drug and Cosmetic Act, regulating substances through pre-market petitions or the generally recognised as safe provision, while the European system under Regulation (EC) No 1333/2008 requires centralised EFSA risk assessment before any additive is placed on the positive union list maintained by the European Commission.

The review closes with a roadmap toward alternatives that preserve safety without chronic synthetic exposure. Bio-preservation applies bacteria or their bioactive metabolites to inhibit foodborne pathogens; bacteriocins such as nisin and pediocin are ribosomally synthesised peptides from lactic acid bacteria that target foodborne pathogens while being rapidly degraded by human proteases in the upper gastrointestinal tract. Essential oils and polyphenols from rosemary, thyme and oregano, rich in carvacrol, thymol and rosmarinic acid, can replace synthetic antimicrobials and antioxidants, though their safe application depends on establishing precise dosage thresholds, evaluating metabolic degradation pathways and conducting comprehensive toxicological assessments, since matrix variability, possible allergenicity and dose-dependent cytotoxicity or pro-oxidant activity complicate their evaluation. Advanced physical processing offers another route: high-pressure processing uses cold pasteurisation pressures up to 600 megapascals to inactivate vegetative pathogens without rupturing the covalent bonds of vitamins or flavour molecules. Smart active packaging integrates volatile natural antimicrobials into biodegradable films and releases preservation agents only as spoilage markers increase, reducing the overall chemical load within the food itself, while artificial intelligence systems couple biosensors monitoring volatiles and microbial metabolites with decision engines for quality management.

The authors’ conclusion is measured rather than alarmist. Food additives remain essential structural pillars of the global food architecture, ensuring preservation and microbiological protection across large transit networks, and the review does not dispute their efficacy. But it argues that the paradigm that acute survival justifies chronic biological disruption is no longer scientifically tenable, and that existing regulations primarily evaluate individual additives rather than the combined, long-term exposure from diets high in processed foods. The evidence base carries clear limitations that the review itself acknowledges: most cellular and immune dysregulation findings derive from in vitro and animal models with exposures often higher than realistic human dietary intake, making direct translation to human health difficult, and the strongest human evidence remains observational. Within those constraints, the review positions the shift toward clean-label alternatives and intelligent preservation technologies as a realistic framework for replacing synthetic agents while maintaining the microbiological safety that additives were invented to deliver.

Subject of Research: A comprehensive review of food additives, their role in food safety and preservation, and evidence on chronic health effects

Article Title: Food additives at the intersection of food safety, freshness, and human health: a comprehensive review

Article References: Belachew, M., Kassa, M., Erku, E., Teferi, D., & Ayalew, D. (2026). Food additives at the intersection of food safety, freshness, and human health: a comprehensive review. Food Safety and Risk, 13(1), Article 44. https://doi.org/10.1186/s40550-026-00168-8

Image Credits: AI Generated

DOI: 10.1186/s40550-026-00168-8

Keywords: food additives, food safety, ultra-processed foods, emulsifiers, artificial sweeteners, gut microbiota, titanium dioxide, EFSA, FDA, preservatives, foodborne pathogens, clean label