If you have infinite utilities, how can you ever justify prioritizing something finite and likely, like eating lunch, over something unlikely but infinite?

Why is eating lunch "finite", given that we have the possibility of becoming gods ourselves, and eating lunch makes that possibility more likely (compared to not eating lunch)?

ETA: Suppose you saw convincing evidence that skipping lunch would make you more productive at FAI-building (say there's an experiment showing that lunch makes people mentally slow in the afternoon), you would start skipping lunch, right? Even if you wouldn't, would it be irrational for someone else to do so?