RNA interference-mediated Fabp4 germline knockdown in mice on a high fat diet also increased body weight and fat mass but did not significantly affect glucose and lipid homeostasis [64], which is similar to phenotype of the diet-induced obesity in FABP4 heterozygous knockout mice [14] and indicates that residual FABP4 protein sustains some elements of its function in metabolic control. This evidence concerns the gene FABP4 and obesity due to melanocortin 4 receptor deficiency.