Canada is so large a single answer isn't appropriate, in remote areas they pay far more than say in Toronto or Vancouver. Prices also drastically vary by store and whether you are in the center of a city versus the suburbs where land for grocery stores is less expensive.

The thing that bothers me the most is shrinkflation. Here's an example with Macdonalds.

What's a more useful comparison is as a percentage of income what does the average household spend on food? In Canada and UK it's low, or under 10% of net household incomes. Go somewhere like Barbados or Costa Rica and it's a wonder how locals can even afford to eat outside of their gardens.

This is an interesting site: https://ourworldindata.org/grapher/food-expenditure-share-gdp