1. A method for offering proposals and/or information about suitability of nutrients, and/or medical substances for a user by communicating via a user's data terminal, the method comprising: 1) establishing data transmission connections between a central server and a data communication network and the user's data terminal, where said data communication network comprises information about relations between genes and health properties, how the genes influence said health properties, information about relations between nutrients and/or medical substances' health properties and how the nutrients and/or medical substances influence said health properties, and a) gathering via said data transmission connection from said data communication network continuously information of an influence of at least one gene and/or at least one gene being in a functional state to at least one health property in a healing or harmful manner with a certain probability, providing cross references between said genes and related health property and providing a numerical probability weighting coefficient of the influence of at least one gene and/or at least one gene being in a functional state to at least one health property in a healing or harmful manner with a certain probability, b) gathering via said data transmission connection from said data communication network continuously information of influences of nutrients and/or medical substances to at least one health property in a healing or harmful manner with a certain probability, providing cross references between said nutrients and/or medical substances and related health properties and providing numerical probability weighting coefficients to nutrients and/or medical substances influencing said health property in the healing or harmful manner with the certain probability, c) gathering via said data transmission connection information of the user's gene and/or the user's gene being in the functional state, and providing a numerical indication in a predefined format of the user's gene and/or user's gene being in the functional state to identify said gene, d) gathering via said data transmission connection from said user's data terminal information, or information pertaining to amounts, about nutrients and/or medical substances consumed and/or to be consumed by the user via an interactive graphical plate displayed by the user's data terminal; followed by 2) comparing by a processing and analyzing equipment of the server indicated user's gene with gene information gathered in step 1a) to find out correspondence; 3) finding by the processing and analyzing equipment of the server health properties related to said correspondence gene via the cross references provided in step 1a); 4) selecting by the processing and analyzing equipment of the server the numerical probability weighting coefficient between said gene and at least one health property, to which said gene influences when being in the normal and/or in the functional state; 5) finding by a processing and analyzing equipment of the server nutrients and/or medical substances related to said health property via the cross references provided in step 1b); 6) selecting by the processing and analyzing equipment of the server the numerical probability weighting coefficients between said health property of step 4) and nutrients and/or medical substances of step 5) influencing the said health property in the healing or harmful manner with the certain probability; 7) comparing by a processing and analyzing equipment of the server information about nutrients and/or medical substances consumed and/or to be consumed by the user gathered in step 1d) and taking into account amounts of the corresponding nutrients and/or medical substances by adding or subtracting their amounts from the recommended amounts; 8) forming individualized optimal nutrition and/or medical substance information with amounts to be consumed by ordering by the processing and analyzing equipment of the server the numerical probability weighting coefficients determined in step 6) to describe the suitability of nutrients and/or medical substances for the user so that the nutrient and/or medical substance influencing to said health property in the most healing manner is offered as the proposal; 9) modifying the amounts of the individualized optimal nutrition and/or medical substance provided in step 8) by adding or subtracting the already consumed amounts of corresponding nutrients and/or medical substances find out in step 7); and 10) communicating via said the information about the nutrition and/or medical substance in the order provided in step 8) and with modified amounts provided in step 9) as a proposal to the user via the user's data terminal at least partly as an interactive graphical plate displayed by the user's data terminal information.