Provided is an inhibitor of visceral fat loss, which is capable of suppressing body weight loss peculiarly found in Parkinson's disease patients. The inhibitor of visceral fat loss in Parkinson's disease patients of the present invention contains a lipid obtained by subjecting a medium-chain triglyceride that includes as a constitutive fatty acid at least one of a saturated fatty acid having 8 carbon atoms and a saturated fatty acid having 10 carbon atoms to a transesterification reaction with a vegetable oil. The lipid is preferably obtained by subjecting the medium-chain triglyceride to a transesterification reaction with the vegetable oil at a ratio of 10:90 to 20:80.
