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Nitrites (often found in food such as hot dogs, cold cuts, and smoked products as sodium nitrate or sodium nitrite) interfere with the natural vasodilator nitric oxide, that is vital to sexual function. Viagra prompts nitric oxide to open blood vessels, nitrates block this effect. (Giuffre, Kenneth, MD, and Theresa Foy DiGeronimo. The Care and Feeding of Your Brain. p 91-93. NJ:The Career Press Inc, 1999.)