It is intended to provide a liquid diluent, with which energy-supplying components such as fats, proteins and saccharides can be diluted without diluting a mineral component or a vitamin component in controlling the caloric value of a fluid diet per serving, and a solid food from which the liquid diluent can be easily prepared. Namely, a liquid diluent for diluting a fluid food composition containing a mineral component and/or a vitamin component which comprises the same mineral component and/or vitamin component as those contained in the fluid food composition as described above and water.
