The invention discloses a
bacterial strain as well as a composition and application, and relates to the technical field of strain separation and application. The Cristinia sp. provided by the invention can be applied to treatment or prevention of
liver function impairment and
liver function impairment related diseases, alimentary canal mucosal injury and alimentary canal mucosal injury related diseases, diabetes,
obesity and
obesity related diseases. The inventor verifies that the Cristinia sp. provided by the invention has no toxic or
side effect on the
kidney and can reduce the weight of the liver; the initial
steatohepatitis focus can be treated;
fat accumulation of liver cells can be slowed down; AST and ALT in serum can be reduced; and abdominal white fat
inflammatory lesion can be reduced. The Cristinia sp. can also repair the
digestive tract mucosa, recover the
barrier function of the mucosa, and prevent and treat intestinal leakage,
peptic ulcer and other diseases caused by
barrier function impairment. The Cristinia sp. also has the effects of reducing fasting blood-glucose of a body, regulating
insulin level and reducing body fat of mammals, and has the effects of preventing and treating diabetes and improving the
metabolic function of obese patients.