I think you need to believe in yourself a little more, The diet you are on now is what led you to have the surgery in the first place. Before you sit down to eat these foods think of what they are giving you, you may find the answer to be nothing. You made a huge decision to have the surgery not eating these foods is an easy one. Try using a diary to log what you are eating and plan your meals ahead. You can do it,,,make sure you keep telling yourself that. Good Luck stay focused.