[Problem] the method for producing a sodium-adsorbing solid matter of the present invention comprises the steps of: Preparing a solution containing potassium alginate or ammonium alginate of 0.1 weight per weight per weight; preparing a solution containing calcium alginate of 0.1 weight per weight; preparing a solution containing calcium alginate of 0.1 weight per weight; And a step of adding one of the potassium alginate-containing solution and the calcium salt-containing solution to the other. The salt-removing food composition of the present invention comprises an effective amount of a sodium-adsorbing solid obtained by the process of the present invention. Selected drawing: None

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