I can't comment on fasting in particular, but as another comment pointed out, I think the idea that you need to immediately get protein before/during/after a wo

I can't comment on fasting in particular, but as another comment pointed out, I think the idea that you need to immediately get protein before/during/after a workout is a bit overblown. My understanding is that protein can be rate-limiting for hypertrophy if you don't have enough in general, but timing is not as largely important. I believe there is a rough window for anabolic signaling / net-positive muscle protein synthesis that lasts up to 48 hours after exercise