Damn it dad! Stop embarrassing me in front of my friends! It’s like High School all over again.
Perhaps it is an acknowledgement that it belongs to god, and only through his divine permission can we gain nourishment from it.
Exactly, precisely, 100% the same thing that not blessing something does.
Tangent: In Judaism, one cannot bless things, one only blesses God.
Among my Christian relatives, this is more of an in-joke than an assertion regarding the state of the food. It’s understood that no one eats before the blessing, and it’s also also understood that if you show up late, no one expects you to say your own blessing before partaking. The blessing, aka “saying grace,” is a general statement of thanks for the food and company, plus a request for G-d’s favor on those in attendance and elsewhere.
So among my highly unscientific sample population, it’s not the food that is being blessed, and not a blessed thing happens to the food.