The invention relates to a cosmetic process for treating human perspiration which consists in applying to human keratin materials a composition containing, in a cosmetically acceptable support, at least one compound comprising at least one free carbonyl function that is capable of reacting with at least one amine compound via the Maillard reaction, and more particularly with proteins of the horny layer of the skin. The present invention also relates to the cosmetic use, as an agent for treating perspiration, of at least one compound comprising at least one free carbonyl function that is capable of reacting with at least one amine compound via the Maillard reaction.