Composition for preventing or treating lipid-related metabolic diseases, comprising lactobacillus plantarum atg-k2 or atg-k6

A method of preventing or treating non-alcoholic fatty liver disease in a subject, the method comprising administering to the subject a composition comprising, as an active ingredient, at least one selected from the group consisting of a strain of Lactobacillus plantarum ATG-K2, a culture product of the strain, a concentrate of the cultured product, and a dry matter of the culture product, thereby preventing or treating non-alcoholic fatty liver disease in the subject, wherein Lactobacillus plantarum ATG-K2 has the accession number KCTC 13577BP.