Is there something we are supposed to convince you of?
> Do you actually believe that before the 1900s and the invention of advertising, nobody knew about food?
1900s? Even what is considered "modern" advertising dates back to the 17th century – i.e. the 1600s.
> I don't see how you can make such a big claim without resorting to "well, daddy telling you to eat cucumber is a form of advertising".
Okay, but unless "daddy" hales from Mesopotamia, then he didn't really stumble upon one in nature by happenstance. The rest of world only came to learn of the existence of cucumbers through advertising.
Alright, it's all good and dandy to play devil's advocate to everyone, but it would be nice if you didn't mind sharing your definition of "advertising" that dates back to the 1600s and includes "knowing about the existence of vegetables".
By the 1600s, people were letting it be known about wares they wish to sell and whatnot in newspapers; a practice that continues today. This is generally considered the birth of "modern" advertising.
If you want a definition, pick a definition – come up with something on the spot, even. It makes no difference to me.
> Without some kind of advertising, she also wouldn't know anything exists – even healthy food.
Do you actually believe that before the 1900s and the invention of advertising, nobody knew about food?
I don't see how you can make such a big claim without resorting to "well, daddy telling you to eat cucumber is a form of advertising".