The invention relates to the use of a compound comprising D-mannoheptulose and/or perseitol for producing a drug for treating and/or preventing diseases related to the modification of an innate and/or acquired immunity by increasing the production of antimicrobial peptides, preferably hBD-2 without inducing inflammatory reactions, irritation or intolerance. Said compound can also comprise a peptidic avocado extract and/or a peptidic lupin extract.