Is muscle building different for me because i have cf?

So I really feel that its different for me... some how. Its harder for me to make muscular gains. I eat a ton of calories (well, I sorta THINK I do lol), I workout 4-5x a week lifting weights. i've been weighing myself every few days, and it ends up i haven't gained any weight which is a really good sign that someone is building muscle so do those with cf build muscle differently?
Source: Cystic Fibrosis Exercise and Fitness Forum - Category: Respiratory Medicine Authors: Tags: Exercise & Fitness Source Type: forums