Data storage control circuitry for controlling storage and retrieval of data in a data store in which data is stored in data blocks. This method may further comprise, prior to quantitative determining the metabolites, combining the biological sample with a second biological sample in which the metabolites are not isotopically labeled or are isotopically labeled differently from the first biological sample; and determining in said biological samples the relative quantity of metabolites which differ by their isotopical label. As a result, a vehicle controller changes a vehicle control content of the own vehicle, thereby performing an appropriate vehicle control with respect to the newly detected control object to eliminate a sense of discomfort of the occupant.