Keltham will eat, trying to maintain his continuing momentum and enthusiasm about what is, in fact, an attempt to destroy his new reality. His mind will show a lot of repetitions of 'If the Conspiracy is real, I want to know the Conspiracy is real, if the Conspiracy is not real, I desire to know it is not real' and 'In worlds where this is actually a Conspiracy and Carissa never loved me it is better to know earlier rather than later' and the like.
He's trying not to think much about his plans for the Ostenso trip in the unlikely event that's allowed. His mind briefly thinks something about Ostenso Academy and then deliberately thinks about how he's trying to throw out some false thoughts to confuse the Conspiracy and thinks this thought after both the accidental thoughts and the deliberate ones, and then he successfully refocuses his attention on the food and how much he doesn't want to lose Carissa.
His thoughts will also briefly cover how he's not even thinking, honestly hasn't thought about it, about whether definitively refuting Conspiracy would be enough info for him to think about kids. He is not that absolutely confident that tropes don't exist.