The purpose of the present invention is to provide a novel drug or food which can prevent or ameliorate a series of symptoms caused by gastric hyperacidity such as sour stomach and stomachache, reflux esophagitis, esophageal cancer and so on without resorting to the anti-Helicobacter pylori effect of a lactic acid bacterium.The present invention relates to a gastrin production inhibitor, which comprises dead cells of a bacterium belonging to the genus Lactobacillus, and a food composition comprising the same. In particular, the present invention relates to a gastrin production inhibitor wherein said bacterium belonging to the genus Lactobacillus is Lactobacillus gasseri (more particularly Lactobacillus gasseri OLL2716).
