This causes food to remain in the stomach longer.  The gastro-oesophageal sphincter (Valve which is present between the Oesophagus and Stomach) is  also relaxed. This causes the reflux of food into the oesophagus. All these three factors the slowed movement, the delayed gastric emptying and the reflux of food in to the oesophagus due to relaxation of the sphincter causes gastritis in pregnant women.

- Eat small meals but frequent meals.

- If gastritis bothers you, it is preferable to avoid, spicy and oily food. 

- Avoid lying down immediately after having food, try to walk or sit upright for some time, in other words eat early and give a gap before you go to bed for the food to get digested

- Eat fresh fruits and vegetables