Almost 100% flights on Chinese carriers provide meal to ALL passengers - First, Biz and Economy.

Quality of said meals is variable and at times questionable.

Have had excellent meals in First / Biz - have had some shockers in Economy.

If flying Economy do as Moondog suggests - put the nose bag on before you board. Plenty restaurants in T3 - little known fact their is even a Maccas in T3 - Level 1 - right down left end as you face exit from arrivals - if you try to find it and cannot - keep walking another 200 mtrs - it is there.

Long story short do not rely on food on domestic Chinese flights - now to the wine served in First / Biz - Dragon Seal or Great Wall - ugh - would kill a brown dog.