The seed oil debate: are they uniquely harmful relative to other dietary fats? — Episode 380
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Recommendations from this episode
In transcript order-
Avoid trans fats — they are clearly atherogenic; this is why margarines containing 25–40% trans fats confounded older PUFA-vs-SFA trials.
“trans fats are absolutely atherogenic
CaveatsFDA has effectively banned trans fats in foods.Certaintyexplicitstrong warning -
If you want the Parkinson's-protective effect associated with smoking, use non-tobacco nicotine rather than picking up cigarettes.
“Choose non tobacco nicotine, please
CaveatsDo not start smoking; nicotine — not tobacco — appears to provide the benefit.Certaintyhedgedoffhand mention -
Statins lower LDL and reduce cardiovascular risk; Norton personally started one at age 40 due to familial high LDL.
“I started taking a statin when I was 40 years old
CaveatsEarlier intervention is better due to cumulative lifetime LDL exposure.Certaintypersonal onlypersonal use -
Norton had a coronary calcium score done to assess his cardiovascular risk despite high LDL; it was low for his age.
“I had a coronary calcium score done
Certaintypersonal onlypersonal use -
Guest recommendation
Substituting polyunsaturated fats (including seed oils like corn, safflower, canola, soybean) for saturated fat lowers LDL and reduces cardiovascular events; they are not uniquely harmful.
“on balance, you're still better off with the polyunsaturated fats
DosageSubstitute for saturated fat in roughly 1:1 isocaloric ratioCaveatsDon't use seed oils repeatedly for deep frying in thin layers at high heat over long periods; in those conditions oxidation products and trans fats accumulate.Certaintyexplicitrecommendation -
Alternative
If you don't want to eat seed oils, use monounsaturated-fat sources like olive oil or avocado oil as substitutes for saturated fat.
“try to find some monounsaturated fats. So, like, olive oil, avocado oil
CaveatsAppears less cardioprotective than PUFA but still beneficial vs saturated fat.Certaintyexplicitrecommendation -
Avoid food fried in thin layers of oil repeatedly reused or held hot all day — that's when significant oxidation products, aldehydes, and trans fats accumulate.
“frying, refrying in over and over... significant amounts of these negative products
Certaintyexplicitmild caution -
Build strength and lean mass — overall strength and VO2 max are enormous predictors of longevity, far more impactful than worrying about seed oils.
“your strength, your lean mass, your activity levels, enormous predictors of how long you will live
Certaintyexplicitstrong endorsement -
Eat enough dietary fiber — it consistently reduces risk of cardiovascular disease, cancer, and mortality across nearly all studies.
“eat enough fiber
Certaintyexplicitrecommendation -
Limit saturated fat intake; substituting polyunsaturated fat for saturated fat lowers LDL and reduces cardiovascular disease risk on balance.
“try to limit your saturated fat
DosageReduce SFA, substitute with PUFA or MUFACertaintyexplicitrecommendation -
Cutting seed oils often helps because it forces you to cut ultra-processed foods like chips, cookies, and junky dressings — the real culprits.
“you are simply going to eat less Oreos, less potato chips
Certaintyexplicitrecommendation