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Butter Out, Plant-Oils In as Landmark U.S. Study Finds Daily Swap Cuts Death Risk by 17%

Butter V Plant-Oils visual media

Butter is back in the firing line, this time not from influencers, but from one of the largest nutrition studies ever published. A new JAMA Internal Medicine paper (May 2025, led by Mass General Brigham and Harvard researchers) tracked more than 221,000 U.S. health professionals over 33 years.


The verdict - those who ate the most butter faced a 15% higher risk of dying, while those reaching for plant-oils like olive, canola, or soy oils enjoyed a 16% lower risk. So simply swapping one tablespoon of butter for plant-based oils a day cut overall and cancer-related mortality by 17%.


For PlanetFood.News readers, this isn’t about fearmongering, it’s about the supermarket shelf. At a time when “seed oil” paranoia is flooding TikTok, the hard data shows plant-based oils aren’t villains, they’re lifesavers. The real story? Science is finally catching up to what Mediterranean kitchens already knew.


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