Additives and the microbiome: what a new review means for clean label

A scientific review published on 22 October 2026 describes additives as potential, context-dependent influences on the gut microbiome. It examines 6 substance classes across 4 biological pathways and proposes additional assessment tiers. At the same time, the authors stress that causal links with most chronic diseases remain unproven. This supports neither a blanket judgement against E numbers nor proof that clean label is safer.

What the review examined

The authors assessed laboratory, animal, observational and controlled human studies of emulsifiers, non-sugar sweeteners, preservatives, colours and other classes. They considered changes in microbial communities, metabolites, the mucus barrier and immune responses. The strongest direct human and ex vivo signals concerned certain emulsifiers and sweeteners, but even there some studies produced conflicting results.

According to the review, many epidemiological findings for metabolic and cardiovascular endpoints come from the same French cohort. Reported hazard ratios were generally 1.03–1.15 per exposure increment and relied on estimated rather than directly measured intake. These are small associations with potential confounding, not evidence that a single additive causes disease.

What the authors propose for assessment

The proposed tiered process starts with exposure-realistic laboratory and fermentation models, moves signal-positive substances to animal models with functional and barrier endpoints, and uses controlled human studies only where justified. Microbiome composition alone would not count as an adverse effect; repeatable changes would need to coincide with functional or host endpoints.

This is a scientific proposal, not a new EU rule. EFSA assesses authorised additives using the available evidence and proposed uses. More than 300 substances are authorised in the EU; for older approvals, EFSA says that more than 70% of 315 substances have now been re-evaluated. Evidence gaps can trigger further testing or changed conditions.

Clean label answers a different question

Clean label is not one uniform official quality mark. A short or familiar-sounding ingredients list may simplify a purchasing decision, but alone it says nothing about dose, shelf life, hygiene, nutrition or the effect of the overall diet. Natural substances can also perform additive functions; conversely, an E number identifies an assessed substance and is not a warning symbol.

Avoiding additives can be a personal preference. Scientifically, however, the relevant questions concern the specific substance, use level, food and whole diet. The new review itself cautions against class-wide conclusions: results for one emulsifier or sweetener cannot automatically be transferred to every substance in that group.

A practical label check

• First identify the kind of food and intended use instead of counting only the length of the list.
• For additives, read the function and the specific name or E number; both must be identifiable in the EU ingredients list.
• Also compare products in the same category using nutrition information per 100 g or 100 ml.
• For allergies, check the emphasised allergens; clean-label advertising does not replace mandatory information.

Conclusion: take the research gap seriously without dramatising labels

The review provides a coherent plan for bringing microbiome data more systematically into future assessments. It does not demonstrate a blanket health risk from authorised additives or an automatic advantage for short ingredients lists. In everyday life, a varied selection matters more than fear of individual codes. Kochzauber’s recipes by ingredient and recipes by meal help people cook more often from manageable staples.

Sources

• Nutrients: review of additives as microbiome-active exposures, 22 October 2026
• European Food Safety Authority: food additives, assessment and re-evaluation
• European Commission: mandatory food labelling in the EU

Author: Kochzauber editorial team. Updated: 24 October 2026. The publication is a scientific review with a proposed assessment framework; it replaces neither official substance-specific assessment nor personal medical advice.