Food fermentation agents can not only expand the volume of food, but also produce a soft sponge-like porous structure in the food, making it full and soft in taste. Secondly, this sponge-like porous structure can make saliva quickly penetrate into the sponge structure of the food when chewing, decompose the soluble substances in the food with saliva, stimulate the taste buds, and enable people to taste the flavor of the food more quickly.