The food at Doha Airport is very bad. Last year when we went for vacation, we had a sandwitch from Airport (Sterling restaurant)and that caused food poison to my 6 year old son. We had a very tough time during the entire flight (approx 4 hours) even though the airline crew tried to provide some medicines, he was continously omitting till we reached our destination and admitted to local hospital.
So please refrain from taking food at Doha Airport.