In this eye-opening second installment of our series on cardiovascular disease, Dr. Ravi Kumar dives deep into the forgotten history and modern science behind one of the most controversial components of our diet: seed oils.

We’ll explore how linoleic acid—the dominant fat in seed oils—became a staple in the modern food supply, why its structure makes it chemically fragile and pro-inflammatory, and how its oxidation within LDL particles may be the real spark that ignites atherosclerosis.

You’ll learn:

• Why the diet-heart hypothesis linking saturated fat to heart disease falls apart under scrutiny
• The disturbing truth behind how seed oils are chemically extracted using hexane
• How linoleic acid disrupts the body’s inflammatory balance and contributes to chronic disease
• Why LDL isn’t the villain—but what’s inside LDL particles might be
• The striking findings from forgotten studies like the Sydney Diet Heart Study, the Minnesota Coronary Experiment, and Dr. Malhotra’s Indian railway worker research
• Practical steps to reduce seed oil intake and rebalance your omega-6 to omega-3 ratio

If you’ve ever wondered why heart disease remains the world’s #1 killer despite decades of low-fat advice, this episode will challenge what you think you know—and offer a clearer path forward.

References:

Seven Countries Study – Ancel Keys et al. (1970)
https://pubmed.ncbi.nlm.nih.gov/6739443/
Epidemiological study of 11 579 men in seven countries showing a correlation between saturated-fat intake and heart-disease rates (association, not causation)

Sydney Diet Heart Study – Ramsden et al., BMJ 2013
https://www.bmj.com/content/346/bmj.e8707
Randomized trial replacing saturated fat with high-linoleic safflower oil; intervention group experienced 70 % more coronary events and 62 % higher all-cause mortality

Minnesota Coronary Experiment – Ramsden et al., BMJ 2016
https://www.bmj.com/content/353/bmj.i1246
Randomized trial swapping saturated fat for corn oil; participants aged 65 and over in the PUFA group had higher mortality and no reduction in atherosclerosis at autopsy

Controlled Feeding Trial on LDL Oxidation – Hunter et al. (2000)
https://pubmed.ncbi.nlm.nih.gov/10694774/
Participants on an oleic-acid–rich diet (olive oil) had LDL particles significantly more resistant to oxidative modification than those on a linoleic-acid–rich diet (sunflower oil)

U.S. Adipose Linoleic Acid Trends – Ramsden et al. (2015)
https://pubmed.ncbi.nlm.nih.gov/26567191/
Review showing adipose-tissue linoleic-acid content rose by 136 % since the late 1950s, mirroring increased dietary intake of seed oils

Indian Railway Workers Heart-Attack Rates – Malhotra (1969)
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC487855/
Analysis of over one million workers: North India (high saturated-fat diets) had low CHD rates, while South India (high seed-oil diets) had a 675 % higher heart-attack mortality

Soybean Oil Consumption Increase – Allison et al. (2011)
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3076650/
U.S. food-supply data demonstrating per-capita soybean-oil consumption rose more than 1 000-fold from 1909 to 1999, driving up dietary linoleic acid