Before establishing a correct dietary program, it is necessary to determine the nature of the stones. Nephrolithiasis consists of the formation of stones or solid material in the kidney from changes in the composition of the substances that make up the urine, either due to excess crystallization or defect. These substances can be divided into different types according to their composition. Among the most frequent materials are calcium oxalate, calcium phosphate and uric acid, which are more related to diet.