A recent narrative review published in the journal Nutrients examines the effects of seven individual non-nutritive artificial sweeteners and mixed exposures on gut microbiota composition and host metabolic health, according to a July 23 article. The review highlights that dose, formulation, diet, and individual biology are important factors when interpreting potential effects of these sweeteners.
The study synthesized findings from 624 unique publications after duplicates were removed. These included in vitro, ex vivo, animal, and human studies grouped by sweetener and evidence layer. The review focused on saccharin, cyclamate, aspartame, acesulfame potassium (Ace-K), sucralose, neotame, neohesperidin dihydrochalcone (NHDC), as well as studies of mixed exposures. No formal risk-of-bias assessment or meta-analysis was performed.
Researchers found that the metabolic effects of non-nutritive artificial sweeteners remain ambiguous due to their diverse structures and formulations. Human multi-omics studies indicate that gut microbial metabolism can contribute to host metabolic processes such as insulin resistance and glycemic variability. The interplay between specific compounds, formulations, and dietary matrices further shapes outcomes.
Findings showed inconsistent results: some artificial sweeteners altered metabolic or microbial profiles depending on compound identity, dose, duration of exposure, study population, or research setting; others showed neutral effects. For example: sucralose’s impact ranged from reductions in certain beneficial bacteria to minimal changes or even improved insulin sensitivity depending on context; aspartame was linked with altered microbial function but human data often showed no clear impairment; saccharin’s effect varied by dose and host background; Ace-K had variable impacts depending on sex-specific factors; NHDC suggested possible benefits in animals but lacked human data; neotame changed animal microbiota but had limited observed health impacts in humans; cyclamate’s evidence remained inconclusive.
The NAS-MAP knowledge graph was developed to help organize scientific evidence across compounds by connecting information about exposure conditions with microbiota results and health outcomes. This tool is designed for traceability rather than establishing causality between variables.
Authors concluded that artificial sweeteners have diverse—and sometimes inconsistent—effects on gut microbiota composition and host metabolism. They noted ongoing research gaps regarding which compounds or exposures have meaningful biological or clinically relevant impacts.
