Final answer:
The primary focus of hospital foodservice is the patient experience, ensuring nutritional support for healing and meeting dietary needs. 'Transformation' is not a pillar of food security, whereas 'Availability', 'Access', 'Utilization', and 'Stability' are the established pillars.
Step-by-step explanation:
The main focus of hospital foodservice is B) Patient experience. Foodservice in hospitals is crucial as it directly relates to patient care, including the nutritional aspects which support healing and recovery, as well as providing individualized meals to meet the diverse dietary needs of patients. It is not primarily centered around profitability, employee satisfaction, or cost efficiency, though those factors may also be considered in the broader context of hospital management.
In terms of food security, the one that is not among the four pillars is D) Transformation. The four pillars of food security, as established by the United Nations, are: A) Availability, B) Access, C) Utilization, and E) Stability. They collectively ensure that all people have access to sufficient, safe, nutritious food to maintain a healthy life.