So this has a potential evolutionary aspect to it. In caveman days you had to wake up, triage the current environment for threats(weather, animals etc) and the

So this has a potential evolutionary aspect to it. In caveman days you had to wake up, triage the current environment for threats(weather, animals etc) and then once that was done you would go out and try to find food. It makes sense that your stomach would take a back seat till the above had been taken care of. It would then trigger the hunger feeling to motivate you to focus on food.