Summary
Dave Feldman and Alan Flanagan debate whether the "lipid triad" of high LDL, high HDL, and low triglycerides truly reduces cardiovascular risk. The discussion digs into LDL causality in atherosclerosis, with Feldman arguing this phenotype is benign and Flanagan defending the established lipid hypothesis.
Key Points
- The "lipid triad" (high LDL, high HDL, low triglycerides) is common on low-carb diets and its cardiovascular risk is actively debated.
- Feldman argues that high LDL in the context of high HDL and low triglycerides represents a different risk profile than high LDL alone.
- Flanagan defends the causal role of LDL particles in atherosclerosis regardless of HDL or triglyceride context.
- Mendelian randomization studies support LDL causality, but critics note these don't capture the full metabolic phenotype.
- The triglyceride-to-HDL ratio may be a better predictor of cardiovascular risk than LDL alone for metabolically healthy individuals.
- Both sides agree that more research specifically on lean, low-carb individuals with this lipid pattern is needed.
Key Moments
The lipid triad hypothesis of high LDL with high HDL and low triglycerides
Danny Lennon introduces the central debate of the episode: Dave Feldman's hypothesis that high LDL cholesterol does not confer high cardiovascular risk when paired with high HDL and low triglycerides, a combination he calls the lipid triad.
"that is the hypothesis that in the context of high HDL cholesterol and low triglycerides within that context, then a high LDL, and typically we're talking about LDL cholesterol, but as we'll discuss later, this will extend to LDL particle number a well. But the high LDL isn't cause for concern"
Does a ketogenic diet change the relationship between LDL and heart disease
The episode sets up a structured debate between Dave Feldman and Alan Flanagan on whether elevated LDL cholesterol caused by a low-carb or ketogenic diet carries the same cardiovascular risk as elevated LDL from other causes.
"Hello, you are listening to Sigma Nutrition Radio. I am your host, Danny Lennon, and we're at Episode 321 of the podcast."
LDL particle number versus LDL cholesterol in risk assessment
The discussion distinguishes between LDL cholesterol concentration and LDL particle number, explaining that the debate extends beyond simple cholesterol measurements to the actual atherogenic particle count.
"typically we're talking about LDL cholesterol, but as we'll discuss later, this will extend to LDL particle number a well."
