Cooking with Lard vs Seed Oils | Layne Norton, Ph.D.
Attia and Layne Norton examine the debate between lard and seed oils for cooking, dissecting the science behind oxidation, LDL cholesterol effects, and cardiovascular risk. Norton argues that while seed oils have legitimate criticisms, the evidence supports their safety on balance, and emphasizes that messaging matters—marketing lard-fried foods as "healthier" risks misleading consumers into overconsumption of inherently calorie-dense foods.
Key takeaways
- • Monounsaturated fats like olive oil and avocado oil are cardioprotective alternatives if consumers want to avoid seed oils, though they appear less beneficial than polyunsaturated fats.
- • Saturated fats are less prone to oxidation when heated, but the choice between lard and seed oils for frying remains unclear without direct human trials comparing the two cooking methods.
- • Thin layers of oil oxidize quickly during repeated frying, accumulating harmful oxidized trans fats within 20-30 minutes, whereas large volumes under vacuum processing during manufacturing minimize oxidation risk.
- • Social media oversimplifies nuanced nutrition science into viral soundbites that strip away critical context, leading to widespread misinterpretation of research findings and public distrust of scientific evidence.
- • Most people should focus on larger health levers—calorie intake and physical activity—rather than obsessing over which oil their fries are cooked in, as the U.S. averages 3,500 calories daily and less than 20 minutes of activity.
- • Converging lines of evidence and high-quality randomized controlled trials, not isolated studies, should guide dietary recommendations and confidence in cardiovascular health guidance.
Recommendations (2)
"try and find some monounsaturated fats like olive oil, avocado oil. There's other sources of oils that you could use that are still relatively cardioprotective or beneficial."
Layne Norton · ▶ 1:01
Mentioned (3)
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