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.
All tea contains oxalates that may cause kidney stones. The most common type of kidney stone is the calcium oxalate stone formed in the kidney when soluble oxalates combine with soluble calcium compounds to form the highly-insoluble calcium oxalate.