Well, actually it's an airline hack.
Next time whenever you are boarding a flight just remember this:
Why feel ashamed of asking for more food?:
The food that’s served onboard an aircraft has a short shelf life, since it’s delivered premade. All excess containers with food are immediately disposed after the flight. Therefore, if your stomach asks more, don’t be ashamed to ask a flight attendant for another serving.
Be the last person to board:
If you checked in for a flight at a different time to your fellow traveler, there’s a solution: just board last. When all the passengers take their seats, you can immediately see which seats are empty. And the fact that the door has already been closed behind you and there will be no more passengers gives you the opportunity to occupy any empty seat onboard.
Cheers!!