heterocyclic aromatic organic compounds consisting of a pyrimidine ring fused to an imidazole ring. Examples are nucleotides Adenine and Guanine, Caffeine, Uric acid. Foods highest in purines are sardines, liver, dried Boletus mushrooms, beans and Cocoa. Gout, a painful form of arthritis, occurs uric acid, a product of metabolic breakdown of purines, is accumulated in high amounts crystallizing around a joint. Coffee has moderate levels of purines but it does not always increase uric acid levels and may even decrease them because of other compounds that could prevent the formation of uric acid stones (for example, phenols like chlorogenic acid)
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