Traditional interventions aimed at improving patient self-management and at motivating the patients to change behaviour seem to be insufficient in adolescents with very high HbA1c. In this paper we present a case consisting of nine adolescents with poorly controlled diabetes type 1. They had previously shown continuously high levels of HbA1c for 2 years despite intensive follow-up and were therefore invited to participate in a coaching program. The coaching program was conducted by professional certified coaches and consisted of two group and eight individual coaching sessions. After completing the coaching sessions, HbA1c had decreased significantly in six out of nine of the adolescents. The participants were interviewed twice following the coaching sessions. All participants reported that they found the sessions very rewarding, and several explained that they now saw themselves differently and had gained more self-esteem and more energy.