A computer-implemented system for providing recommendations to a user in respect of consumable or topically appliable products, such as food and beverages. At least a part of the system is a body-worn part (e.g., a wearable device). The system includes a product code reader, one or more sensors for obtaining data indicative of one or more physiological/biochemical functions of the user, or indicative of a user environment, and a processor configured to determine product recommendations for products identified using the product code reader, based upon a user's personal biological information and data obtained using the sensor(s). The wearable device can include a memory storing a database of product codes and associated product recommendations.