By the way, they always have snacks available throughout the flight. So feel free to ask for seconds of the main courses, they might be able to oblige you and it's worth a try.

But if not, there are other options for the rest of the flight. Usually a sandwich you can order, and a ramen noodle dish, and some various packaged cookies and snacks that are out on a tray for anyone to help themselves. I've slept through entire meals and sustained myself on the side snacks before.