Fenretinide reduces muscle and liver ceramides and increases dihydroceramides. Lipids from soleus (Sol.) and liver (Hep.) were extracted from tissues of mice receiving SD, HFD, or HFD with fenretinide (HFD+FEN) after 4 weeks of treatment. A–D, in both soleus (A and B) and liver (C and D), the HFD-induced increase in ceramides was prevented with FEN treatment (A and C). Moreover, FEN increased dihydroceramides in both tissues (B and D). *, p < 0.05 for treatment versus SD. +, p < 0.05 for HFD+FEN versus HFD (n = 6).