PURPOSE: To obtain a fibrous food having a flavor and texture extremely similar to those of animal meat and improved nutritive value, by blending a raw mate rial containing beer yeast and protein material, heating, pressurizing, shearing, cooling and extruding to make protein into texture.

CONSTITUTION: A raw material containing beer yeast and a protein material (preferably vegetable or animal protein) is at least blended, heated, pressurized, sheared, cooled and extruded so that the protein is made into texture to give the aimed food. Texture formation of protein is preferably carried out by a twin-screw extruder. The beer yeast in the food is subjected to bitterness removal treatment and the content of the beer yeast is preferably 10W50wt% (calculated on dry base).