Diet to promote healing in a budgie?

 
Diet to promote healing in a budgie?
I just bought a pair of budgies but one of them has a broken wing. It has already gone to the vet and the lady I bought them from loved them to death, so I don't doubt it. The reason she sold them was because she's moving to an elderly living arrangement. My question is, how can I change his diet to promote healing? As in specific fruits/veggies, proteins, fluids etc.