The present invention relates to a method for producing a processed solid soy protein product derived from soy meal (SBM), wherein the protein product comprises 65-75% by weight of dry matter protein and the weight ratio of protein to potassium is at least about 50%. : 1, the dry matter content is at least about 90%, the product is substantially free of sodium and at least about 65% by weight of the indigestible oligosaccharide content of the SBM from which the protein is derived has been removed, the method comprising: 1) providing an initial mixture comprising soybean meal (SBM), milled or flaked or otherwise degraded, and water； 2) the dry matter in the initial mixture Leaching the initial mixture between 8 and 20% by weight at a temperature of 5 to 65 ° C. and a neutral pH of 0.15 to 6 hours； 3) dissolving the leached mixture in the liquid fraction and the first solid 4) First leach mixing Adjusting the pH of the liquid fraction from the compound to a value of 3.5 to 5.5 with an acid； 5) transporting the acidified liquid fraction through a separation means such as a decanter centrifuge or similar means, Separating the waste liquor and collecting a further solids fraction, 6) combining the solids fraction from the initial leach mixture with the solids fraction collected from the separation means, 7) together Drying the dried solids fraction to a dry matter content of at least about 90%, and 8) the total amount of water used in the method calculated from the initial SBM starting material is not more than about 10 times the amount of SBM. On the method. A processed solid soy protein product derived from soy meal (SBM), wherein the protein product comprises 65-75% by weight of dry matter protein, the weight ratio of protein to potassium is at least about 50: 1, and the dry matter content is It also relates to products that are at least about 90% substantially free of sodium and have at least about 65% by weight of the indigestible oligosaccharide content of the SBM
