Yes .. don’t eat thoseI'm a metformin user of many years duration @mousemat and have not noticed any increase in urine output.
Aside from drinkng plenty of water and water-based beverages like tea and coffee every day, have you tried any specific dietary changes to help with a history of kidney stones? For instance, patients are often advised to avoid foods with a high oxalate or sodium content, such as almonds, rhubarb and spinach.