If you have formed this habit of forcing kid to demand screen while eating, STOP it now! Find alternative. This is example of careless and lazy parenting.
1) Kids already have short attention spans. Having TV along with meal further divides it. Lesser focus on meal -> Indigestion
2) Kids learn unwanted human habits from advertisements. You shape their consumer habit.
3) They pick up unnecessary products targeted to them
4) Visuals limit imagination instead enhancing it.
Stop it. If at all needed, you sing a song or enact a scene! Don’t take shortcuts and ruin your kid’s future.