Ensuring nutritionally adequate food intake in institutions is a complex and important challenge for dietitians. To tackle this problem, we argue that dietitians need to adopt a systematic, integrative, and patient-centered approach to identify and manage more effectively organizational determinants of the quality of food intake under their control. In this study, we introduce such an approach, the blueprint-based case study, that we applied in the context of a midterm care facility for elderly patients. Data gathered through interviews and field observations were used to develop, from the perspective of key patient encounters, detailed representations of the food, nutrition, and nursing activities necessary to ensure adequate food intake. These service "blueprints" were developed to illustrate all activities that might potentially impact on the nutritional, sensory, functional, and social quality of patients' meals. They were also used as roadmaps to develop a case study analysis in which critical areas were identified and opportunities for improvement put forth, while considering services' resources and priorities. By providing a precise, objective, yet comprehensive mapping of the service operations and management, the blueprint-based case study approach represents a valuable tool to determine the optimal allocation of resources to insure nutritionally adequate food intake to patients.