Summary
This systematic review and meta-analysis synthesises evidence from observational studies to evaluate whether dietary nitrate and nitrite derived from plant sources are associated with altered risk of digestive system cancers. By restricting the analysis to plant-sourced nitrate and nitrite — distinct from processed meat sources — the study likely finds a neutral or potentially protective association, given the co-presence of antioxidants in plant foods. The review contributes to the ongoing scientific debate around dietary nitrates by disaggregating exposure by food source, which is methodologically important for interpreting cancer risk.
UK applicability
The findings are broadly applicable to UK dietary guidelines and public health policy, particularly in the context of recommendations to increase vegetable consumption; UK bodies such as the Food Standards Agency and NHS may draw on such evidence when communicating the safety and benefits of plant-rich diets relative to processed meat consumption.
Key measures
Relative risk (RR) or odds ratio (OR) with 95% confidence intervals for digestive system cancer incidence; dietary nitrate and nitrite intake levels from plant sources
Outcomes reported
The study examined the association between dietary intake of nitrate and nitrite specifically from plant sources and the risk of digestive system cancers, including colorectal, gastric, and oesophageal cancers. Pooled risk estimates from eligible observational studies were calculated to determine whether plant-derived nitrate and nitrite confer protective or harmful effects.
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