Sleeve gastrectomy did not change BAT weight (Figure 4b), but improved BAT morphology and function, as shown by the reduction in brown adipocyte hypertrophy (Figure 4a,c) and steatosis (Figure 4d), together with the repression of the transcription of the lipogenic genes Pparg2, Mogat2 and Dgat1 (Figure 4e–g). This evidence concerns the gene DGAT1 and steatosis.