A LOW-FAT FOOD COMPRISING AN AMINO ACID OR A PEPTIDE HAVING AN EFFECT OF ACTIVATING A CALCIUM RECEPTOR SUCH AS Y-GLU-X—GLY (X REPRESENTS AN AMINO ACID OR AN AMINO ACID DERIVATIVE), Y-GLU-VAL—Y (Y REPRESENTS AN AMINO ACID OR AN AMINO ACID DERIVATIVE), Y-GLU-ALA, Y-GLU-GLY, Y-GLU-CYS, Y-GLU-MET, Y-GLU-THR, Y-GLU-VAL, Y-GLU-ORN, ASP-GLY, CYS-GLY, CYS-MET, GLU-CYS, GLY-CYS, LEU-ASP, D-CYS, Y-GLU-MET(O), Y-GLU-Y-GLU-VAL, Y-GLU-VAL-NH2, Y-GLU-VAL-OL, Y-GLU-SER, Y-GLU-TAU, Y-GLU—CYS(S-ME) (O), Y-GLU-LEU, Y—GLU-ILE, Y-GLU-T-LEU, Y-GLU-CYS(S—ME), ETC.