Weights and measures matter.
Back way back in the day it was the lb of coffee. It's actually 11.5 oz.
Portion control matters too.
As far as advertising goes, those are not real food photographs. They are sculpted and have a high gloss. They are under hot lights and out all day.
I saw a post about the food in the displays being there 5 years and not rotting.
It's all nasty gross. 4951