Rehabilitation After a Hip Fracture: the Effects of Dietary Protein and Exercise on Bone and Muscle Health and Quality of Life

In order to be eligible to participate in this study, a subject must meet all of the following criteria: * Age ≥ 65 years * Acute hip fracture * Able to give written informed consent * Mentally competent, as judged by the treating physician * Admission to a rehabilitation centre that participates in this research A potential subject who meets any of the following criteria will be excluded from participation in this study: * Allergic, intolerant or hypersensitive to milk/lactose (self-reported) * Not willing to stop using dietary supplements with exception of calcium and vitamin D * Pathological fracture or periprosthetic fracture * Abnormal hepatic or renal laboratory parameters, such as estimated glomerular filtration rate (eGFR) \<30 ml/min/1,73 m2 (data from hospital) * Diagnosis of disorders/diseases where a high protein intake can be harmful, such as renal impairment or failure, or liver disease (geriatric care physician has the decisive voice) * Diagnosis of bone metabolic disorders such as primary hyperparathyroidism, Paget's disease, or myeloma. * Taking medication other than bisphosphonates known to strongly alter bone, calcium or muscle metabolism, such as oestrogen, hormone replacement therapy, corticosteroids, anabolic agents, or calcitonin. * Disorders/diseases which may affect ability to follow study protocol and which cannot be overcome with help of a caregiver * Current participation in other scientific research * No permission to request information from the general practitioner/ treating specialist(s) about medical history, medication use, liver and kidney values, and details about the broken hip