Meningitis / Prednisone / Weight gain

 Hi I'm asking this before consulting with Hadley's Vet. ( we have a apt this Thurs. for a complete rework of his blood work to see if we can start weening him off the Prednisone ) He contracted Meningitis some how 2 and a half weeks ago, took 3 days to get the diagnosis and the meds needed to save his life. My question is will this type of diet help him put muscle mass back on that he has been loosing from the use of Prednisone? We will hopefully be starting the weening process Thursday. I am just trying to eliminate another potential problem before it gets worse. The vet did mention to us that this would happen due to the high dosage of the pill.