Not eating is not a causative factor for gastritis... this
misconception has been long thought of and is still now among the
patients... When one don't eat, the acid produced is lesser because
there is no food to stimulate its production, but since these acid
is harmful, it will be neutralized under normal conditions by the
bicarbonate - mucus layer in the epithelial lining...
Gastritis happens when there is an imbalance in the stomach's
defensive and offensive mechanism... Offensive mechanism includes -
taking aspirins (NSAIDs), smoking, alcohol ingestion, H pylori
infection, reflux of bile from the duodenum and others...