Description of work and role of participants This is a randomized clinical trial (RCT) on the effect of fish consumption on mobility in elderly who experienced a hip fracture. Elderly who experienced a hip fracture but were able to walk without support by a person before the fracture, will receive, after being randomized to two groups, fish or meat to be used in cold or warm meals at 4 days per week for a period of 16 weeks. Measurements will be taken at baseline (when patients have left the rehabilitation center), after 4 weeks and after 16 weeks. Measurements at 4 and 16 weeks after inclusion will be at their homes or in the outpatient clinic.