I was told by my surgeon that I should try to eat things that I’ve had all along but in moderation. My situation is a little more restrictive than yours so eating smaller portions of things you like would be a good starting point. I’m sure that an endocrinologist would still push for a balanced plate with equal portions of protein, carbs and veggies/fruits. The lack of your duodenum causes for the lack of an initial place where the food will initially get its digestive enzymes. This causes for the food to go directly into the stomach so the breakdown process will be slower and less complete. If you can avoid taking Prilosec or one of its shelf mates, it might be beneficial as this class of pills hampers the nutritional adsorption process. Also be good to start your eating regimes with your veggies/fruits then work to the carbs and then onto your proteins. This helps with the processing and nutritional adsorption. Just a tip but try to stay away from sausages and pepperonis when eating pizza! They tend to coat the stomach lining and prevent proper nutritional adsorption.