A food nutrition management system provides a portable electronic device to a user for inputting a personal data and special codes. The personal data and the special codes are received by a register and management unit for further registering at a database. The database is searched for a food nutrition component table corresponding to a special code. The food nutrition component table searched is transmitted for displaying on a display unit, stored in the database when a store instruction is input through the portable device, and analyzed and compared with a suggestion of daily ingestion amounts per person for a variety of nutrition when an inquiry instruction is input. The portable electronic device displays current and past ingestion amounts for the variety of nutrition and notices the user of which nutrition is insufficient or surplus and of the possible diseases and symptoms.