PROBLEM TO BE SOLVED: To provide a method for improving quality of taste by enhancing the depth and mellowness of the taste of various foods and drinks in a simple and inexpensive way, without spoiling the original taste of foods and drinks and foods and drinks by the method.SOLUTION: The method for enhancing the depth and mellowness of the taste of foods and drinks includes using an yeast extract having a content of free amino acids such as free glutamic acid, free glycine, and free alanine of less than 3 wt.%, a content of nucleic acids (total content value of inosinic acid and guanylic acid) of less than 12 wt.%, and a content of common salt of less than 2 wt.%.
