So-called "buttergate" anecdotes have been spreading online, with many Canadians complaining that their butter does not soften at room temperature.
Food experts have churned up palm fat in cow feed as a likely culprit.
The dairy industry insists the claims are unfounded, but has created a working group to seek answers.
Buttergate began with a question posed on Twitter by Canadian cookbook author Julie Van Rosendaal: "Have you noticed it's no longer soft at room temperature?"
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