> Do you need advertising to tell you about bread, vegetables, meat?
Looking around at the world, yes?
Less-heathy takeaway chains do advertise constantly, and concepts like the food pyramid are there to literally "tell you about bread, vegetables, meat" as an advertisement for a better alternative.
People aren't born knowing this - if they don't learn it from parents, they will either learn it from someone else, or not know it and have a poor diet out of ignorance.
https://www.bbc.co.uk/news/articles/cq5y2vzlyldo
> 4 January 2026: Junk food adverts are banned on television and online starting on Monday as part of a drive to tackle childhood obesity.
It seems that the factual answer is "yes", in certain conditions of the most addictive food and most susceptible audience.