Atrophic gastritis usually has gastric mucosal lesions, a small amount of fish oil generally does not stimulate the gastric mucosa, can eat a moderate amount of deep-sea fish oil, should avoid eating a large amount of fish oil, so as not to aggravate the burden on the stomach. Atrophic gastritis is usually caused by Helicobacter pylori infection, bile reflux and other factors that lead to atrophy of the gastric mucosal epithelial glands, which may result in symptoms such as abdominal distension, abdominal pain, belching and acid reflux. Deep-sea fish oil is rich in unsaturated fatty acids, and eating a moderate amount of fish oil generally does not irritate the gastric mucosa. Chronic atrophic gastritis usually gastrointestinal tract digestion and absorption capacity is poor, if eating a large amount of fish oil, too greasy, not easy to digest and absorb, may increase the burden on the stomach. Atrophic gastritis patients diet should be under the guidance of the doctor, pay attention to dietary regulation. Usually pay attention to regular quantitative eating, avoid overeating. Eat more fresh vegetables, fruits, etc.