I fed my cats once, but somehow the cat food never runs out.
I have the bowls on the terrace of my Japanese house (the smallest version), just in case it has something to do with that. I can say that they drink the water (it's next to the food bowls on the terrace) and that gets empty too. I also never get a signal that they're hungry. So they eat it, but it doesn't run out, if that makes sense.