Although it would be a challenge to fast i strongly feel that they should fast. God has done SO much for everyone, and although they didn't get to eat much, this was the one time God wanted something in return. All of them pretty much gave up faith, but by doing this, we know that they still do have some sort of faith left. I feel like it is very important for them to fast because, although they think that God isn't helping them right now, he always has a plan. It would be so important for them to fast, because they would feel like they were giving back to someone that gave them life its self.