It is a complex phenomenon. The marketing aimed at children is everywhere and it is extremely powerful. You have only to think of the McDonald's brand, which is recognized by 93% of children from 3 to 5 years of age, who don't even know how to read and write yet. You can imagine the power of the exposure to those brands and the impact this has on their demands. You have only to go to the grocery store on the weekend to see mothers and fathers being irritated by their children's incessant demands.
As for the Quebec law, displays were excluded from it. It focuses much more on traditional advertising and we know that Quebec has a lower obesity rate than other Canadian provinces. As the lady was saying, various factors explain our collective weight gain, but that probably is a contributing factor.