FABP4 and obesity due to melanocortin 4 receptor deficiency: Heat-killed Lactiplantibacillus plantarum K8, which reportedly has an anti-obesity effect on high-fat diet-induced obesity mice, has been suggested to control adipogenesis caused by FABP4 and lipogenic enzymes in gonadal adipose tissue via suppressing the expression of peroxisome proliferator-activated receptor γ and CCAAT/enhancer binding protein α40.