A food additive composition admixed with fish mince consisting of a hydrophilic powdery colloidal solid having a particle size smaller than 20 mesh and comprising 60 to 99% of a sugar alcohol or a sugar, 30 to 0.5% of a food-grade surface-active agent and 30 to 0% of an edible oil or fat. The food additive can be prepared by adding a food-grade surface-active agent and an oil or fat to a melt or aqueous solution of a sugar alcohol or a sugar to dissolve them or disperse them in a fine particlar form, optionally adding a sugar alcohol or a sugar as a seed crystal, solidifying the solution or dispersion to form a colloidal solid, stabilizing the colloidal solid by crystallization, optionally drying the stablized solid, and pulverizing it to a particle size smaller than 20 mesh.