After the battle with the night crawlers where Dustin levelled up, he began travelling once again towards the light he saw from afar, and despite his theories, there was no other choice left at that point. Through out the journey, or at least for most of it, he survived eating only the night crawler meat he collected before, and to his surprise, it didn't upset his stomach, and it filled the stomach well. The only downside was the incredibly disgusting taste and the occasional case of indigestion where he figured his stomach was not quite used to this food. Apart from that, everything was ok.