“…However, bariatric surgical procedures such as Roux-en-Y gastric bypass, one of the most common surgical procedures in recent years, one anastomosis gastric bypass, and biliopancreatic diversion/duodenal switch are associated with an increased risk of stone formation in patients with or without a previous history of urolithiasis [33][34][35], which has been mainly attributed to increased urinary oxalate excretion [34][35][36][37]. Even after sleeve gastrectomy, a significant increase in urinary supersaturation of calcium oxalate was observed [38]. Lifelong replacement therapy and monitoring of protein, vitamin and mineral deficiencies are required, particularly after malabsorptive surgery, and management of dumping syndrome, gastro-oesophageal reflux, and hypoglycaemia can be challenging to treat [31].…”