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The Proof · February 10, 2025 · 78m
Clearing the Confusion Around Saturated Fat, Cholesterol, Paleo, and Keto
NYU internist Dr. Michelle McMacken cuts through the saturated fat debate, explaining why the 'butter is back' narrative is misleading, how LDL drives atherosclerosis, and why Paleo and Keto claims about saturated fat safety don't hold up.
This summary was generated from show notes and public descriptions, not from a full transcript review. Details may contain inaccuracies.
Highlights
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LDL cholesterol is causal in atherosclerosis — not just a bystander — confirmed by Mendelian randomization
McMacken: Mendelian randomization studies (nature's randomized trials) confirm that lifetime lower LDL from genetic variants produces proportionally lower cardiovascular disease. LDL is not merely associated with heart disease — it directly causes it.•
The 'butter is back' narrative was media hype, not science — the original meta-analysis was misinterpreted
McMacken: the 2014 Chowdhury meta-analysis that spawned 'butter is back' headlines actually showed that replacing saturated fat with refined carbs (not polyunsaturated fat) produced no benefit. When properly analyzed, replacing saturated fat with unsaturated fat consistently reduces cardiovascular risk.Was this useful?