We have investigated the response of different fat deposits to a 28 h fast in healthy nonobese males and shown significant increases in CH2 IMCL in both the soleus and tibialis anterior muscles, and significant decreases in subcutaneous fat. Increases in TA and SOL IMCL correlated with oleic and palmitic acid FFA concentrations respectively. The compositional change of IMCL during the fast related inversely to the baseline composition, suggesting a selective efflux of unsaturated shorter chain IMCLs for preferential oxidation, which is in agreement with rat biopsy data, and supportive of the idea of IMCL as a flexible lipid store.
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