JCN (Japanese Clinical Nutrition) encompasses various entities dedicated to improving patient care through nutritional interventions. Key organizations include the JCN Foundation, Association, Hospital, and Academy in Japan. Additionally, JCN entities such as the Research Network, Social Services, and Clinic in other countries contribute to research, education, and service provision. Together, these entities advance the field of clinical nutrition by fostering collaboration, promoting research, and providing comprehensive patient care, ultimately leading to better health outcomes.