Another transgenic mouse model for lipoatrophy was created using the dominant negative protein A-ZIP/F under the control of the aP2 promoter.22 The transgene A-ZIP/F prevents DNA binding of b-ZIP transcription factors of the C/EBP and Jun families, causing early impairment of growth and differentiation in WAT.22 A-ZIP/F-1 mice are hyperphagic and hypermetabolic, and develop diabetes with marked insulin resistance and fatty liver (Table 1). Implantation of WAT reverses the metabolic phenotype including improvements of whole-body insulin sensitivity, hyperglycaemia and hyperinsulinaemia.23 These data demonstrate that a lack of adipose tissue causes diabetes and dyslipidaemia.