Effectiveness of Integrated Care Combined Nutrition and Lifestyle Counselling in Frail Older Patients With Diabetes

The goal of this clinical trial is to evaluate the effectiveness of innovative integrated care in pre-frail or frail patients with diabetes over 65 years old. The main questions it aims to answer are: * To establish innovative integrated care for frail elderly patients with diabetes combined with nutrition and lifestyle guidance. * To evaluate the effectiveness of the intervention compared with general outpatient care. Participants will receive 12 weeks of structured care including specialist care, integrated assessment, group health education, one-on-one nutrition and lifestyle guidance, online and face-to-face support group, and case management. Researchers will compare general outpatient care to see its effects on frailty, physical function, and blood sugar control.