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.
Because of this, many experts recommend eating more foods that are naturally high in calcium to prevent kidney stones. Based on actual calcium absorption rates, the best foods in this category include leafy greens, cruciferous vegetables, nuts and seeds, and raw, grass-fed milk and butter.