About UNHCR. The Office of the United Nations High Commissioner for Refugees was established on December 14, 1950 by the United Nations General Assembly. The agency is mandated to lead and co-ordinate international action to protect refugees and resolve refugee problems worldwide.
Another common type of kidney stone is a uric acid stone. Red meat and shellfish have high concentrations of a natural chemical compound known as a purine. High purine intake leads to a higher production of uric acid which then accumulates as crystals in the joints, or as stones in the kidneys.
1 Calcium stones. 2  Most kidney stones are calcium stones, usually in the form of calcium oxalate. 3  Oxalate is a naturally occurring substance found in food. 4  Some fruits and vegetables, as well as nuts and chocolate, have high oxalate levels. Certain genetic factors also may increase your risk of uric acid stones. 2  Cystine stones. 3  These stones form in people with a hereditary disorder that causes the kidneys to excrete too much of certain amino acids (cystinuria). 4  Other stones. 5  Other, rarer types of kidney stones also can occur.