A methodology for customers seeking to purchase a meal from a food service vendor such as a restaurant, a cafeteria, or a vending machine, by ordering a food preparation based upon menu-selections. In addition to receiving ordered food, customers receive suggestions for optionally modifying their food orders based upon nutritional benefits and other criteria. Either during real-time customer-ordering or during post-ordering, a food-service vendor presents a customer suggestions specific to a pending tentative or completed order, wherein the customer may enjoy purported nutritional benefits by electing to follow these suggestions and thereby modify the tentative order into a corresponding completed order. Alternatively, the customer may elect to ignore these suggestions, but may nonetheless decide to effect such food-ordering modifications during subsequent visits. The food selection criteria implemented by a food service vendor is independent of individual customer identity and preferences, and are flexible and readily adaptable to accommodate changes such as a food service vendor's marketing strategy, customer-food preferences, discoveries pertaining to nutrition and consequent good health; and may be adapted to a plethora of food service environments. The preferred embodiment contemplates a restaurant environment in which customers typically approach a food-ordering counter and interface with both a menu display and with order-taking personnel. Other embodiments implicate kiosks, vending machines, remote access devices, and locally and remotely-accessed networked computers, wherein customers interact with automated computer-driven devices instead of or in addition to wait-staff or other food service personnel.