The concentrated liquid diet disclosed is a concentrated liquid diet having a total amount of a medium-chain fatty acid having 8 carbon atoms and a medium-chain fatty acid having 10 carbon atoms included as constitutive fatty acids of a triglyceride being 2.5 to 8.0 g per 100 kcal of the energy of the concentrated liquid diet, the concentrated liquid diet having in the total mass of the medium-chain fatty acid having 8 carbon atoms and the medium-chain fatty acid having 10 carbon atoms the rate of the medium-chain fatty acid having 10 carbon atoms being no less than 60% by mass, and the rate of the medium-chain fatty acid having 8 carbon atoms being no greater than 40% by mass.