I learnt from my first few cubensis trips that eating food before/at the same time/immediately after dulled the trip massively and even added to stomach upset. Now if I'm intending on shrooming in the evening, I'll avoid all solid foods (or even any kind of food) for at least 8 hours prior to ingestion, crush the dried cubes up as finely as I can (usually 6-8 grams), wrap in a tissue (single ply, tearing off every bit of excess paper), then swallow the tissue ball whole with a few mouthfuls of water. Occasionally I'll follow it up with a black coffee w/ a bit of honey just to get things moving along without adding something that needs to be broken down...but I won't eat until at least after the come up, which by then unless you're complimenting it with weed it's unlikely you'll have an interest in food anyway.
In my experience though, I NEED to eat something at some stage after I've come up, if only to avoid nasty heartburn and digestive system irritation.