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.
1 If you tend to form calcium oxalate stones, your doctor may recommend restricting foods rich in oxalates. 2  These include rhubarb, beets, okra, spinach, Swiss chard, sweet potatoes, nuts, tea, chocolate and soy products.
Diet. If your kidney stone is caused by an excess of calcium, you may be advised to reduce the amount of oxalates in your diet. Oxalates prevent calcium being absorbed by your body, and can accumulate in your kidney to form a stone.Foods that contain oxalates include: 1  beetroot. 2  asparagus.3  rhubarb.4  chocolate.f your kidney stone is caused by an excess of calcium, you may be advised to reduce the amount of oxalates in your diet. Oxalates prevent calcium being absorbed by your body, and can accumulate in your kidney to form a stone. Foods that contain oxalates include: 1  beetroot. 2  asparagus. 3  rhubarb. 4  chocolate.