Mice fed an MFBD for 18 weeks (A) did not experience greater obesity than mice on a traditional LBD, but they displayed (B) marked cardiac hypertrophy and (C) increased cardiomyocyte cross-sectional area. Myriocin treatment attenuated this hypertrophy without affecting weight gain. Black bars, control plus DMSO; light gray bars, milk fat plus DMSO; dark gray bars, milk fat plus myriocin; hatched bars, lard plus DMSO. All results are given as mean ± SEM. *P < 0.05 vs. control.