FABP4 and Hypoglycemia: FA-metabolism-deficient mice, such as KO mice for the MCAD, LCAD, and DECR genes [19]–[21], [26], exhibit metabolic characteristics very similar to those found in the FABP4/5 DKO mice during prolonged fasting (e.g., hypoglycemia, elevated levels of serum NEFAs, and fatty liver).