The longer flights(6 hours or more) you'll definitely get more than trail mix. You don't have to order proper food, it comes with the flight. During my flight to Netherlands and Japan everyone was fed at least twice with decent meals, which is normally a choice between 2 dinners. Usually they will also give you something to drink before and after your meals, which is often water, apple juice, orange juice, pop, milk, or even alcohol. They might even give you ice cream for dessert ;p I think it depends on where you're heading for what kind of food you'll get; it tends to be the local cuisine there.