News that local boutique dairy company Origin Earth picked up a raft of prizes for its cheeses only fuelled my guilt trip.
Half an hour before hearing of their haul I'd thrown back a fruit smoothie furnished with the holy trinity of blueberries, oranges and bananas.
It was, as usual, delicious.
Yet my enthusiasm was curbed when I read the back of the frozen blueberries bag. "Product of Canada".
Annoyed at the shopping faux pas, I checked the sticker on the oranges, which read: "Product of USA".