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Peter Attia MD#19 – Dave Feldman: stress testing the lipid energy model
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At a glance
WHAT IT’S REALLY ABOUT
Peter Attia and Dave Feldman Clash Over LDL and Energy
- Feldman explains his energy model and the 'lean mass hyper-responder' pattern of LDL-C of 200 or higher, HDL-C of 80 or higher and triglycerides of 70 or lower, arguing it may not be atherogenic.
- Attia presses on mass balance, saying the extra cholesterol in these people's LDL must come from increased synthesis, absorption or depletion of other pools, and that Feldman never gave a satisfying account.
- Attia presents his own patient data showing high desmosterol and phytosterols in hyper-responders, which he reads as increased cholesterol synthesis and absorption, and which fell when saturated fat was replaced with monounsaturated fat.
- The two disagree over excluding genetic and drug evidence, with Attia arguing familial hypercholesterolemia and PCSK9 variants are natural experiments and Feldman wanting large non-genetic, non-drug datasets stratified by HDL, triglycerides and LDL-P.
- Attia concludes that a mechanism explaining the phenotype would not by itself show it is benign, and Feldman says he is on a journey of science, not advocacy and is open to being disproven.
IDEAS WORTH REMEMBERING
5 ideasMass balance is the central challenge to the energy model
Attia argues that someone like Craig Moffitt with LDL-C of 335 must be making or reabsorbing more cholesterol, since matter cannot be created, and Feldman eventually concedes increased synthesis is part of the picture.
Sterol panels can help explain why LDL-P is high
Attia describes four drivers of LDL-P: triglyceride burden, cholesterol synthesis (desmosterol), reabsorption (phytosterols) and clearance, and says hyper-responders show high synthesis markers.
Swapping saturated fat for monounsaturated fat lowered LDL-P in hyper-responders
In seven patients Attia put through this protocol while they stayed in ketosis, LDL-P fell without a measurable change in total fat intake, which he takes as support for a synthesis explanation.
The VLDL-driven explanation looks weak in insulin-sensitive people
Attia cites the Garvey data showing VLDL-P rises only slightly with insulin resistance while LDL-P rises far more, and notes ApoC3 tracks insulin, so lean insulin-sensitive people should have shorter VLDL residence times.
Attia treats LDL as necessary but not sufficient for atherosclerosis
He compares LDL to oxygen for fire and says atherosclerosis also depends on endothelial health and inflammation, so he rejects both 'LDL is irrelevant' and 'driving LDL to zero' extremes.
WORDS WORTH SAVING
5 quotesScience is based on skepticism, and certainty is forever elusive, so science gets better and gets sharper through this type of discussion.
— Peter Attia
Nothing is proved. It's about probability.
— Peter Attia
Oxygen is necessary but not sufficient for fire. Can you have oxygen and not fire? Yes. Can you have fire without oxygen? No. The lower the concentration of oxygen, the less likely you are to spontaneously get a fire.
— Peter Attia
Don't confuse the ubiquity of it with its utility, right? The ubiquity of it is yeah, it's cheap, it's easy, everybody's got it.
— Peter Attia
I am on a journey of science, not of advocacy. I'm gonna be quite a skeptic.
— Dave Feldman
High quality AI-generated summary created from speaker-labeled transcript.
