Study of the Effects of the Consumption of Different Products Cocoa Derivatives at the Risk of Crystallization of Uric Acid in Urine of Volunteers.

Without nutritional intervention, it will consist of normal food intake without food derived from cocoa or coffee for a period of 1 day in the group of 20 patients during meals. ( That day the patient can not consume cocoa derivates nor coffe or coffe derivates).

"The nutritional intervention will consist of the intake of 40 g daily a base of food derived from cocoa that will be provided to the paient (Food based on soluble cocoa) during one 1 day period in the group of 20 patients during meals.~That day the patient can not consume cocoa derivates nor coffe or coffe derivates exept the one provided."

"The nutritional intervention will consist of the intake of 40 g daily a base of food derived from cacao (Food based on black chocolate) during a period of 1 day in the group of 20 patients during meals.~That day the patient can not consume cocoa derivates nor coffe or coffe derivates exept the one provided."

"The nutritional intervention will consist of the intake of 40 g daily a base of food derived from cocoa (Food based on chocolate with milk) for a period of 1 day in the group of 20 patients during meals.~That day the patient can not consume cocoa derivates nor coffe or coffe derivates exept the one provided."