The study included 84 children with obesity, an aspartate aminotransferase/alanine aminotransferase ratio below 1, and hepatic steatosis between the I and III stages, who were randomized into two groups: the probiotic group, who were administered a probiotic with 14 bacterial strains associated with diet and physical activity, and the placebo group, who had the same regimen in terms of diet and physical activity, but received a placebo capsule. This evidence concerns the gene GPT and fatty liver disease.