The Study
Lack of Genotoxic and Carcinogenic Potential for Nonsugar Sweeteners: A Review of Animal and Mechanistic Evidence
This study looked at lots of lab experiments on rats and cells to see if artificial sweeteners can cause cancer. It found no strong signs they do — but that doesn't mean they're safe for people. It's like checking if a toy is safe by testing it in a lab, not by watching kids play with it.
Analysis score
Maximum 85 for a systematic review.
Where the score came from
Scientists checked if sweeteners like aspartame and sucralose can cause cancer by testing them in animals and cells, even at super high doses.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 510 / 100
Quality score
Systematic reviews and meta-analyses of cohort studies. They sit above a single cohort study but below a single randomized trial, because the underlying evidence is still observational.
Key takeaways
Summary
Based on the study abstract and findings.
- 1The doses used were way higher than what people drink in soda, and the only possible risk (saccharin in rats) doesn't apply to humans.
- 2No cancer was found in animals exposed to most sweeteners—even at doses 100x higher than humans ever consume.
- 3Saccharin causes rat bladder tumors, but only because of unique rat urine chemistry that doesn't happen in humans.
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Advances in Nutrition
Year
2025
Authors
S.A. Marchitti, Denali Boon, M. Jack, J. Goodman
Related Content
Claims (6)
Saccharin leads to bladder tumors in rats by forming crystals in urine, damaging cells, and triggering excessive cell growth, but these biological processes do not occur in humans because human urine and bladder physiology are fundamentally different.
Current scientific evidence does not show that any of the eight artificial sweeteners trigger biological processes linked to cancer development in models relevant to humans.
Seven artificial and natural sweeteners—acesulfame-K, advantame, aspartame, cyclamate, neotame, steviol glycosides, and sucralose—do not cause DNA damage or tumors, even at doses much higher than what people typically consume.
Studies in animals at very high doses of eight artificial sweeteners show no consistent signs of DNA damage or tumor development, indicating these substances are not biologically plausible as causes of human cancer.
Regulatory agencies consider the Ramazzini Institute's rodent studies on aspartame and sucralose unreliable because of flawed design, absence of proper tissue analysis controls, and high rates of spontaneous tumors in the control groups.
The International Agency for Research on Cancer has categorized aspartame as a substance that may cause cancer in humans, based on limited scientific evidence.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.