Does saturated fat cause heart attacks?
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Does saturated fat cause heart attacks?
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Does cutting saturated fat actually prevent heart attacks?For decades, saturated fat from foods like butter, red meat, cheese, coconut oil, and full-fat dairy has been treated as something to reduce. But the new USDA/HHS dietary guidelines and the inverted food pyramid have made the message a lot less clear.In this episode, Calvin and John look closely at two 2025 meta analyses of randomized controlled trials: Yamada 2025 and Steen 2025. One says there is no clear benefit to reducing saturated fat. The other says there may be a benefit, but mostly depending on your cardiovascular risk and what you replace saturated fat with.We don’t just read the abstracts. We go deep into the studies, recreate some of the charts, check the reported metrics, look at the forest plots, compare odds ratios and risk ratios, and dig into where the conclusions seem strong, weak, or a little too confident.Hopefully, there’s also something useful here about how to think through studies, evidence, and nutrition claims when the answer is not as clean as it first seems.