America's Favorite Cooking Oil Shows Strong Link to Obesity
Dr. Joseph Mercola - Take Control of Your Health
Briana Mercola
4.6 • 1.6K Ratings
🗓️ 22 January 2026
⏱️ 8 minutes
🧾️ Download transcript
Summary
- Soybean oil dominates the U.S. food supply. Americans' intake has increased from about 2% to nearly 10% of calories over a century, alongside sharp rises in obesity and diabetes
- A recent study published in the Journal of Lipid Research found soybean oil drives obesity independent of calories by generating liver oxylipins that track with weight gain, revealing LA metabolism, not food intake, as the key driver of fat accumulation
- Soybean oil promotes oxidative stress, mitochondrial damage, gut permeability, and long-lasting inflammatory byproducts that continue to affect your metabolism for years due to LA's extended half-life in body fat
- Soy contains additional disruptive compounds, including phytoestrogens, phytic acid, enzyme inhibitors, lectins, saponins, and goitrogens, along with frequent glyphosate residues
- Reducing LA intake means eliminating sources of soybean and other vegetable oils from your diet, and replacing them with stable fats like ghee, tallow, butter, or coconut oil
Transcript
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| 0:00.0 | What if the oil in your pantry is pushing your weight up, even when your calories stay the same? |
| 0:05.2 | Welcome to Dr. Mercola's cellular wisdom. Stay informed with quick, easy-to-listen |
| 0:09.9 | summaries of our latest articles, perfect for when you're on the go. No reading required. |
| 0:14.2 | Subscribe for free at Mercola.com for the latest health insights. |
| 0:18.5 | Hello and welcome to Dr. Mercola's cellular wisdom. I'm Ethan Foster, |
| 0:23.1 | and today we're examining why America's most common cooking oil, soybean oil, tracks so |
| 0:29.1 | closely with rising obesity and metabolic dysfunction, and what you can do about it starting now. |
| 0:35.1 | I'm Alara Sky, and we'll keep this direct and practical. |
| 0:39.5 | You'll hear how soybean oil's dominant fat, linoleic acid, drives inflammatory byproducts |
| 0:45.2 | tied to weight gain, why some people seem to be hit harder than others, and the simple |
| 0:49.7 | swaps that lower your exposure without guesswork. |
| 0:53.2 | Soybean oil now saturates restaurant fri, packaged snacks, condiments, and healthy staples, |
| 1:00.0 | rising from roughly 2% to nearly 10% of Americans' calories over the last century, |
| 1:06.0 | while obesity and type 2 diabetes climbed in parallel. |
| 1:10.0 | Despite that trend, seed oils have been marketed as heart-healthy, |
| 1:14.2 | and most people don't realize how deeply they've crept into daily eating. |
| 1:18.1 | A recent University of California, Riverside Study looked past calories to biology. |
| 1:24.1 | Researchers compared normal mice with mice engineered to produce a different liver form of HNF4 alpha, |
| 1:30.3 | changing how their livers process linoleic acid. |
| 1:33.3 | Both groups ate identical calorie high-fat diets for up to 35 weeks, |
| 1:38.3 | one based on soybean oil plus coconut oil, about 10% of calories as linoleic acid, and one based mostly on coconut |
| 1:46.5 | oil, about 2% linoleic acid. |
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