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ArtistFrom nitrate to nitrite: When you eat nitrate (e.g. from vegetables or water), part of it is converted into nitrite by bacteria in the oral cavity. The risk in the stomach: In the acidic environment of the stomach, this nitrite can react with amines (from meat/proteins) and form nitrosamines, which are potentially carcinogenic. The neutralization: Ascorbic acid acts as an "antagonist" by rapidly reducing nitrite to nitric oxide (NO). Nitric oxide is a harmless gas (and even beneficial for the blood vessels), which prevents the nitrite from reacting with the amines to form the dangerous nitrosamines.
Nitrate, found in vegetables and water, is converted to nitrite by oral bacteria. In the stomach's acidic environment, nitrite can react with amines from proteins to form potentially harmful nitrosamines. However, ascorbic acid acts as a protective agent by converting nitrite into nitric oxide, a harmless gas that helps prevent this harmful reaction.