PROBLEM TO BE SOLVED: To effectively use pericarp and squeezed residue of citrus fruits that have been disposed of and to provide an in-vivo lipid deposition inhibitor.SOLUTION: Feed containing a substance derived from citrus fruits, especially pericarp having been removed fruit juice portion of citron, or squeezed residue having been removed extract obtained by squeezing fruit juice portion and extracting the squeezed juice lees using organic solvent such as normal hexane is fed so that increase of body weight is inhibited, blood neutral fat concentration and an amount of visceral fat are decreased, and thus in-vivo deposition of lipid in fed animals, especially fishes, are inhibited.
