PROBLEM TO BE SOLVED: To obtain a medicine for preventing and treating inflammatory intestinal diseases and allergic intestinal syndromes, and a food composition for preventing and treating the inflammatory intestinal diseases and the allergic intestinal syndromes. SOLUTION: The medicine or the food composition for preventing and treating the inflammatory intestinal diseases and the allergic intestinal syndromes contain the cells of Lactobacillus gasseri (LG), especially LG 2055, or their fermentation products as active ingredients. The medicine and the food composition are useful for prevention or treatment, remission of the advance of the inflammatory intestinal diseases and the allergic intestinal syndromes, such as ulcerous colitis, Crohn's disease, and Behcet's disease.
