The present invention relates to an alimentary component comprising a physiologically acceptable phosphorus binding agent, in particular polyallylamine hydrochloride, polyallylamine carbonate, lanthanum carbonate, aluminium hydroxide, magnesium acetate, magnesium carbonate, calcium carbonate, calcium acetate, calcium citrate, calcium alginate, styrene divinylbenzene ionic exchange resin, stabilized polynuclear iron hydroxide, calcium acetate plus magnesium carbonate and chitosan. Said component is useful in the nutrition of subjects in need of a low phosphorus level diet.