 [ Symptoms ] i am on a diet – lost 30 lbs – bladder now overactive – pressure and urgent to use bathroom [ Disease ] hi it is possible that the diet changes that you had made earlier may have caused this weakness of bladder sphincter so the bladder control has got weak but its nothing to worry now that you are eating well again it will gradually be ok and the sphincter will act normally in a few months take vitamin and calcium tablets to hasten up the recovery process thanks