This is a randomized controlled, observer blinded trial to study the beneficial effect of nutritional supplementation in elderly Hong Kong patients after hip fracture surgery during rehabilitation and at 4 weeks follow up. The control group will receive Calcium and Vitamin D supplementation whereas the intervention group will receive a moderately high dose protein nutritional supplementation in addition to Vitamin D and Calcium. Both groups undergo the same rehabilitation program and dietary counseling before discharge. They are followed up 4 weeks after discharge or completion of supplementation. The outcome parameters are nutritional parameters and rehabilitation outcomes.

Inclusion Criteria:

• Age 60 years or older
• Recent low impact osteoporotic fracture of the proximal femur surgically repaired within 4 weeks before recruitment

Exclusion Criteria:

• Patients who require tube feeding
• Patients in unstable medical condition
• Body mass index (BMI) ≧ 25
• Malignancy
• Conditions with contraindication for high protein diet
• Mentally incapacitated and inability to communicate or understand the consent.