An online system retrieves historical interaction data for a user describing objects with which the user previously interacted and health data associated with the user. The system accesses and applies a multiclass classification model to classify whether the user has each of a set of health conditions based on the historical interaction and health data. The system generates a prompt including a set of classes associated with the user and a request for a set of objects appropriate for the user, in which the set of classes indicates whether the user has each health condition and an appropriateness of an object is based on whether the user has each health condition. The system provides the prompt to a large language model to obtain a textual output, extracts one or more objects (e.g., items and/or recipes) from the output, and sends a recommendation for the object(s) for display to the user.