1. Method for arranging a nutrition and medication information service, characterised in that a database arrangement is created, which comprises at least one probability weighting coefficient to at least one gene influencing at least one health property with a certain probability, and at least one probability weighting coefficient to at least one nutrient and/or medical substance influencing at least one health property in a healing or harmful manner with a certain probability, information related to the user is delivered to the said database arrangement, at least one gene from the user's genetic map is compared with the genetic map information of the database arrangement, and the probability weighting coefficient is selected between the said gene, which gene is both in the genetic map of the user and in the database arrangement, and at least one health property, to which the said gene influences, and the probability weighting coefficient is selected between the said health property and at least one nutrient and/or medical substance influencing the said health property in a healing or harmful manner with a certain probability, and information describing the suitability of the said nutrient and/or medical substance for the user is formed with the help of the said probability weighting coefficients.