A method for producing a granular material, comprising treating unprocessed starch(es) with acid treatment, oxidation treatment and/or enzymatic treatment to obtain partially degraded starch(es), the unprocessed starch including 5% by weight or more of amylose relative to the unprocessed starch； obtaining a raw material comprising 45% by weight or more of a starch relative to a total amount of the granular material, the starch comprising 7% by weight or more of the partially degraded starches relative to the total amount of the granular material； and granulating the raw material by heating and compressing with an extruder, wherein a water absorption rate is 250-700% by weight, a compressive syneresis rate is 7% by weight or more, and a content of particles over a sieve of 0.5 mm aperture in the granular material is 40-100% by weight.
