Technically true, unless you're getting force-fed by grandma

That's the joke

Irony

Grandma don’t give a fuuuuck

A fair amount. Plus the food for pictures is rarely edible. Most photo shoots take place in a rooms with a/c and could take hours to finish. The food has to remain looking the same throughout. Steam is added after the fact. It's actually really neat. I saw a mini documentary on it once where they were doing pizza and the "cheese" had to remain melty for hours.

It's also usually glued together.