A new mathematical modelling study from the University of Waterloo suggests vitamin C may reduce the formation of cancer-linked chemicals in the digestive tract that arise from dietary nitrates and nitrites, and that timing of intake could matter. The research, published in the Journal of Theoretical Biology, found that vitamin C can inhibit the stomach chemical reaction known as nitrosation-one pathway that converts nitrates and nitrites into N‑nitroso compounds, which have been linked to higher cancer risk in laboratory and epidemiological studies. (eurekalert.org)
Nitrates and nitrites are common in cured meats such as bacon and salami, and can also enter the food chain through vegetables grown in nitrate‑contaminated soil or water. Inside the acidic stomach environment these compounds can react to form potentially harmful nitrosating agents. Because vitamin C is a potent antioxidant that donates electrons, the model shows it can interrupt or slow those reactions under many realistic dietary scenarios. (bioengineer.org)
The research team built a compartmental model that tracked nitrates, nitrites and vitamin C through the salivary glands, stomach, small intestine and plasma, while accounting for gastric pH, transit times and activity of the oral microbiome. Simulations indicated that foods naturally containing both nitrate and vitamin C-for example, leafy greens such as spinach-may pose a lower nitrosation risk than nitrite‑rich foods eaten without antioxidants. The model also identified meal timing and local conditions as key variables. (news-medical.net)
One practical takeaway from the study is that modest vitamin C supplementation taken after meals with high nitrite content produced a simulated, moderate reduction in predicted nitrosation products; however, the authors stress this is a modelling result, not clinical proof. Lead author Dr. Gordon McNicol and senior author Prof. Anita Layton say the model is a mechanistic roadmap to guide targeted laboratory and clinical studies that measure nitrosation biomarkers, antioxidant status and microbiome effects in real people. Until such trials are done, the findings should not be read as a recommendation for high‑dose supplements but rather as a reason to study timing and food combinations more closely. (timesofindia.indiatimes.com)
The study adds to a complex and sometimes conflicting literature on vitamin C and cancer: observational work often links higher dietary vitamin C with lower disease risk, while randomized supplement trials have yielded mixed results. The Waterloo model highlights why context-what you eat with, when you take an antioxidant, and local water or soil nitrate levels-may explain those inconsistencies and help design better clinical tests. (ecancer.org)
Original Source: https://medicalxpress.com/news/2026-05-vitamin-cancer-dietary-patterns-quality.html
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Publish Date: 2026-05-20 22:50:00
