What should I eat if I have gastritis?

Bland diet. Eat foods that have few additives and spices. Fruits, vegetables and grains are good sources of these. Avoid spicey, citrus and dense foods as they can further irritate the lining of the stomach.
Clear liquid & bland. For the first day to 2 days eat thin soups, no dairy. Then increase to bread, crackers, rice, pasta for the next 2 days. Check back with your doctor to make the next plan in your healthcare. Good luck.