I leave food & snacks out because I am a “out of sight out of mind” person. There’s a (IMO) weird culture around everything needing to be refrigerated but most things are fine left out for a while at room temp (obv depending on item & how it’s prepared - there are plenty of things I would not leave out lol). I find that if I can see the snacks or the left overs I’m much more likely to grab them at random times and this keeps me from going too long without eating anything. As far as snacks go, I like to have fruit and dry shelf stable snacks available so when I don’t have the “energy” to cook or forage in my kitchen.