Gastritis patients can eat tomatoes, but try not to eat during an attack of gastritis, as follows: 1. Tomatoes are rich in vitamins, such as vitamin C, carotene and B vitamins, can improve the body’s resistance and immunity, high nutritional value, which citric acid and malic acid, can also promote the digestion of food, absorption, play a role in improving the function of the stomach and intestines. 2. Absorption.