RNA isolation and real-time qPCR. Total RNA was isolated from the
livers of 6 mice per dietary treatment after being homogenized in 1 mL
TriReagent (Sigma-Aldrich), and cDNA was synthesized as detailed in
Betancor et al. (39). The expression of genes of interest (Supplemental
Table 4) was determined by qPCR normalizing the results against b-actin. qPCR was performed by using a Biometra TOptical Thermo-cycler (Analytik Jena).