A logging system (200) and a method of registering data for enabling monitoring of intake of a product by a user according to an intake plan are provided. The logging system (200) comprises a dispensing device (220) for dispensing the product to the user who operates the dispensing device by manual interaction and a logging device (240). The dispensing device has identification data (ID) which identifies the device itself or identifies the product dispensed by the device. The dispensing device and the logging device are able to communicate via body coupled communication. When the dispensing device and the logging device are both in the close vicinity of the body of the user (110) who carries the logging device during said manual interaction, the identification data is transmitted via body coupled communication to the logging device which subsequently stores the received data in a data storage.