According to this article (in French) we spend an average of $200 more per year than people in the rest of Canada, and people in the Montréal metropolitan area spend the most on food. (People from abroad will note that this is despite the fact that Ontario and Alberta, for example, are far wealthier on average).
Statistics Canada data confirms that Québec likes to eat - and we are more likely to go to speciality shops - butcher's, greengrocers, fish markets, which cannot help but boost the grocery bill.
We are also less likely to buy supermarket home brands, and to shop at "discount supermarkets"
And more likely to consume speciality or artisinal products.
Of course, there are a lot of people who eat crap here, and an old working-class tradition of particularly bad and unhealthy food. But it is interesting that the statistics actually bear out our growing foodie reputation. I have certainly noticed a difference, for example if I visit people in Toronto.. And the interest in food seems to extend to francophones, anglophones and allophones here.