Seed Oils:The Villain Story That's Half True

The internet has decided seed oils are a public enemy. But is the panic warranted — or have the scholars dropped the scholarship in the bully pulpit?

In this fireside chat, Ashok and Meera Vasudevan take the criticism seriously and take it apart. Yes, industrial extraction is ugly. Yes, reusing frying oil is a real problem. Yes, the modern omega-6 to omega-3 ratio has gone wildly off course. But that's not a seed problem — it's a processing problem. And lumping olive, sesame, mustard, and coconut oil into the same villain bucket as refined industrial soybean oil isn't just unfair. It's bad nutrition advice.

Drawing on the latest peer-reviewed evidence — including 2025 systematic reviews and a Johns Hopkins study showing higher linoleic acid levels are linked to a lower risk of type 2 diabetes — this episode separates the grain from the chaff. And the seed from the oil.

Five minutes. Evidence-based. A little cheeky. Zero panic.

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Hosted by Meera & Ashok Vasudevan

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Transcript

SPEAKER_00 0:03

The other day, Mugab, I was listening to a podcast. It's a it was a fireside chat between two well-known nutritionists, reasonable people. They have real credibility. And suddenly, in the middle of that chat, they started lambasting seed oils, calling them a public enemy. And what struck me wasn't the concern, because some of it was genuinely warranted. What struck me was how the scholars actually dropped their scholarship in the bully pulpit. Every seed, every kind of processing, every fatty acid all lumped into one big villain story called the seed oil. And I thought that was creating a needless amount of panic.

SPEAKER_02 0:43

I totally agree, it's very true. And that is why we wanted to do this episode a little differently. You know, we're not here to defend seed oils wholly, but by the same token, we're not here to attack them either. We want to agree with these critics on what they get right. And respectfully take apart the rest. Separate the grain from the chaff.

SPEAKER_00 1:06

Or maybe separate the seed from the oil.

SPEAKER_02 1:09

That too. So let's start with what the critics do get right, because they do get some of them right. First, industrial extraction is genuinely ugly. To get oil out of a soybean or a rapeseed at that scale, the process typically involves hexane, which is a petroleum solvent. Then the use of high heat, bleaching, and deodorizing. So by the time the oil reaches the bottle, it bears almost no resemblance to anything that your grandmother would have called food.

SPEAKER_00 1:45

And the second is reused frying oil. That's a real concern because when polyunsaturated oils, also called pufas, polyunsaturated fatty acids, are heated to say 160, 180 degrees Celsius, and then reused and reused and reused, the science is unambiguous. They generate compounds called aldehydes, which are genuinely harmful. Restaurant, deep fryers, street vendors going two, three days of the same oil, the Batura shop using the same oil all week. That's where the worry becomes real.

SPEAKER_02 2:24

Yeah. And thirdly, the modern ratio of omega-6 to omega-3 fats has generally gone off the rails. Think of these two fats as a seesaw that requires balance. Our ancestors ate them in roughly equal amounts, about one is to one, or at most four is to one. But today, we are consuming 15 times more omega-6 than omega-3. And sometimes even 20 times more, mostly coming from seed oils and processed foods. That kind of lopsidedness does matter. Because omega-6 fuels inflammation while omega-3 calms it down. The critics are not wrong about that part.

SPEAKER_00 3:10

But here's where it falls apart, Mira, the ratio problem. It's not because of seed oil as a category, it's because cheap, refined industrial oils dominate ultra-processed foods. Take chips, cookies, package snacks. And because the omega-3 side of our diet has collapsed. So less wild fish or less fewer flaxseed, fewer walnuts. So the ratio went haywire from both sides.

SPEAKER_02 3:40

Yeah. And on the inflammation claim, which is the headline charge against seed oils, the evidence has actually moved in the opposite direction.

SPEAKER_00 3:50

Exactly.

SPEAKER_02 3:51

A systematic review of 15 clinical trials found no support for the idea that linolic acid in the diet causes inflammation. A John Hopkins study found people with the highest blood levels of linolic acid had a 35% lower risk of developing type 2 diabetes. The molecule itself, in fact, when eaten as part of normal food, is not the villain that it's been made out to be.

SPEAKER_00 4:21

So the panic outran the science because that absolutely happens.

SPEAKER_02 4:26

And now here's where that lumping really matters. The phrase seed oils is doing far too much work. In fact, it's holding olive, sesame, mustard, and coconut oil. All pressed, traditional, often cold extracted, with thousands of years of culinary lineage behind them, in the same bucket as industrial soybean and industrial corn oil that came out of a 20th-century chemistry lab. The same word, seed oils, but two completely different food stories.

SPEAKER_00 5:12

Or take mustard oil, pungent, deeply trusted across eastern and northern India, and coconut oil, stable for high heat, traditional across Kerala and Southeast Asia. None of these are the problem. They never were.

SPEAKER_02 5:28

And then you know there is the in-between oils. What we are referring to are groundnut, sunflower, safflower. These depend entirely on how they were processed. Cold pressed and used appropriately, perfectly fine. But refined, bleached, deodorized, and reused at high heat in a deep fryer, it becomes a different food entirely.

SPEAKER_00 5:54

So today, three takeaway folks. One, cook with the unrefined and cold-pressed oils as much as possible. Use them in the way your grandmother did. Appropriate to the dish. If you're using refined oils like sunflower and safflower, then use them in moderation.

SPEAKER_02 6:11

That's correct. And secondly, the real seed oil problem is not the bottle on your kitchen counter. It's the refined seed oils hiding inside ultra-processed foods, packet snacks, and fried takeaway. Usually it exists right next to sugar, salt, refined flour. So don't blame the oil alone. Flip the box over, read the label. That's where the trouble is.

SPEAKER_00 6:37

And three, never you reuse frying oil. That's the one place the critiques are unambiguously, right? Once it's been at high heat, retire it.

SPEAKER_02 6:46

Absolutely. So don't fear the seed.

SPEAKER_00 6:49

Respect the oil.

SPEAKER_02 6:50

And read what's on the back of your box.

SPEAKER_00 6:52

I'm Mashok Vasudevan.

SPEAKER_02 6:54

And I'm Mira Vasudevan. This has been another episode of Pay the Farmer, not the Pharmacy. Affordable Wellness 18.