We’ve been told that foods like butter and bacon are bad for us — because they're packed with saturated fats. And top dogs in nutrition say that a better option is vegetable oil, like canola oil. But there’s a trend popping off claiming that these top dogs are barking up the wrong tree. They say that butter is better and that those vegetable oils, aka “seed oils,” are incredibly dangerous. So — who’s right? Is canola oil really killing us? Or is butter the bad boy?

To find out, we speak to author and physician Dr Cate Shanahan and Dr David Iggman.

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