Nitrates and Nitrites as Components of Our Daily Meals. Find Out Where They Come From.
Julia Wójcik
2026-03-23
4 min. read
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Nitrates (V) and nitrites are substances that occur in our daily diet. The mere presence of nitrates (V) does not pose a health hazard. However, it is important to note that these compounds can be converted into nitrites, which in turn can be converted to nitrosoamines, which are risk factors for the development of many diseases.
N-Nitrosamines and their nitrosated derivatives: toxicological mechanisms and health implications as evidenced by experimental research
Nitrate ions (V), through the enzymatic activity of specific oral microbiota, may undergo reduction to nitrite ions (III), which—under the acidic conditions of the stomach—participate in nitrosation reactions, yielding *N*-nitrosamines. Among the most prevalent compounds in this class are *N*-nitrosodimethylamine (NDMA) and *N*-nitrosodipropylamine (NDPA). A comprehensive review of available scientific evidence, particularly from rodent models (primarily rats), permits extrapolations regarding potential human health impacts. Foremost among these is their **procarcinogenic activity**, correlated with an elevated risk of malignancies in the gastrointestinal tract (colon, esophagus, stomach), urinary system (bladder), and kidneys. Additionally, *N*-nitrosamines exhibit **genotoxic effects**—inducing mutations in genetic material—and **embryotoxicity**, which may disrupt fetal development. A 2014 study published in *BioMed Research International* further establishes a link between exposure to these compounds and cardiovascular pathologies, as evidenced by biochemical alterations in rats, including: dyslipidemia (elevated low-density lipoprotein [LDL] coupled with reduced high-density lipoprotein [HDL]), depleted antioxidant defenses, and heightened oxidative stress via free radical accumulation. These mechanisms collectively promote atherogenesis and coronary artery disease.
Nitrates (NO₃⁻) and nitrites (NO₂⁻): dietary sources and their occurrence in human nutrition
Scientific analyses regarding the potential hazards posed by N-nitroso compounds prompt a closer examination of their origins. Of paramount importance is the identification of primary dietary sources of nitrates and nitrites, including processed meat products, crops subjected to intensive agrochemical treatment, and vegetables exhibiting varying capacities for accumulating these compounds. Research conducted by experts in Poznań reveals divergent concentration levels—ranging from elevated amounts in radishes, chives, and rhubarb to negligible traces in tomatoes, peppers, and carrots. While the majority of food products remain within permissible limits, a mindful reduction in the consumption of certain food groups—particularly when considering additional risk factors such as tobacco smoking—may yield health benefits. Paracelsus’ principle serves as a reminder that dosage determines toxicity, thereby enabling a measured approach to the topic without undue alarm.