Does industrial processing of seed oils make them unhealthy to consume?
From October through July, speakers have disputed whether industrial processing of seed oils makes them unhealthy to consume. Gary Brecka (The Ultimate Human) and Nina Teicholz (DarkHorse Podcast) say processing uses toxins and damages oils. Layne Norton (The Peter Attia Drive) says residues are negligible and processing removes impurities.
Yes, processing uses toxins, damages oils, and leaves harmful residues.
Gary Brecka (The Ultimate Human) said seed oils are degummed with a neurotoxin and deodorized with a carcinogen. Brecka said commercial canola oil is degummed with hexane and heated to 405 degrees. Nina Teicholz (DarkHorse Podcast) said the process yields a grayish murky liquid and takes out nutrients. Peter Attia (The Peter Attia Drive) said table seed oils require heating and industrial grade solvents to extract.
5 claims, in their words
-
“it comes out as like this grayish murky liquid or, or substance, and it needs to be deodorized, winterized, stabilized, because the process takes out all the nutrients, some of the nutrients need to be added back in.”
-
“Just know that's not how it occurs in nature. It's been bleached to look that way.”
-
“So you degum it with a neurotoxin, you deodorize it with a carcinogen, and then generally we will bleach it, and then bottle it, and then put it on the, on the shelf.”
-
“for me to get a bottle of corn oil or any of the other seed oils on your table, I have to do a lot of industrial processing. I have to heat these things up. I have to refine these oils. I have to use industrial grade solvents to extract them. It seems very likely that both of those processes”
-
“when you take a canola plant ... and you put it in a commercial press and it comes out gummy, And, and you degum that with hexane, that's a very powerful neurotoxin, and then you take that degummed oil that you've degummed with hexane, and you heat it to 405 degrees, that turns it rancid. So now you have a”
No, residues are negligible and processing removes impurities and oxidants.
Layne Norton (The Peter Attia Drive) said hexane residue is well under one part per million and often non-detectable. Norton said mild hexane side effects require consuming 11,340 kilograms of oil at one time. Norton said manufacturing decreases peroxide status by a factor of about five. Norton said a person would need to eat 200 to 700 kilograms at once for residual sodium hydroxide harm.
6 claims, in their words
-
“to even have mild side effects, what you would need to consume is 11,340 kilograms of oil at one time.”
-
“the actual processing of the seed oils removes oxidants and removes some impurities that are maybe negative.”
-
“When we look at the end product of the oil manufacturing process, it actually decreases the amount of oxidated, so there's a measure they can use like a peroxide status to look at how much is in there. It goes down by a factor of about five to tenfold. And then another measurement of like the aldehyde amount in the”
-
“the amount of oil you'd need to consume to possibly get mild side effects. If anybody wants to, okay, say, let's just say your body couldn't process this out, who's drinking 11,000 kilograms of oil in their lifetime?”
-
“The hexane in the end product, most of them are well under one part per million. In fact, a lot of them have non-detectable levels of hexane”
-
“the amounts that you would need to consume of this oil, and these are all theoretical negative effects, assuming that, for example, pure sodium hydroxide stays in the ink pot, which we know it basically turns into soap and water when you have a chemical reaction. But even if the amount you put in stayed in there till the end,”
Listeners of “No, residues are negligible and processing removes impurities and oxidants.” have not heard
Listeners of these shows have not heard Brecka's point that canola oil is degummed with hexane and heated to 405 degrees.
1 unanswered argument, in their words
-
“when you take a canola plant ... and you put it in a commercial press and it comes out gummy, And, and you degum that with hexane, that's a very powerful neurotoxin, and then you take that degummed oil that you've degummed with hexane, and you heat it to 405 degrees, that turns it rancid. So now you have a”
Listeners of “Yes, processing uses toxins, damages oils, and leaves harmful residues.” have not heard
Listeners of these shows have not heard Norton's point that mild hexane effects need 11,340 kilograms of oil at once. Norton's point that peroxide status falls by a factor of about five. Norton's point that nobody drinks 11,000 kilograms of oil in a lifetime. Norton's point that sodium hydroxide residues would require 200 to 700 kilograms of oil at once.
4 unanswered arguments, in their words
-
“to even have mild side effects, what you would need to consume is 11,340 kilograms of oil at one time.”
-
“When we look at the end product of the oil manufacturing process, it actually decreases the amount of oxidated, so there's a measure they can use like a peroxide status to look at how much is in there. It goes down by a factor of about five to tenfold. And then another measurement of like the aldehyde amount in the”
-
“the amounts that you would need to consume of this oil, and these are all theoretical negative effects, assuming that, for example, pure sodium hydroxide stays in the ink pot, which we know it basically turns into soap and water when you have a chemical reaction. But even if the amount you put in stayed in there till the end,”
-
“the amount of oil you'd need to consume to possibly get mild side effects. If anybody wants to, okay, say, let's just say your body couldn't process this out, who's drinking 11,000 kilograms of oil in their lifetime?”
Brecka's case rests on hexane degumming and 405-degree heat that Norton's show does not address. Norton's case rests on 11,340-kilogram doses and fivefold peroxide drops that the other shows do not address.
2 arguments the other side has addressed
“the actual processing of the seed oils removes oxidants and removes some impurities that are maybe negative.”
“for me to get a bottle of corn oil or any of the other seed oils on your table, I have to do a lot of industrial processing. I have to heat these things up. I have to refine these oils. I have to use industrial grade solvents to extract them. It seems very likely that both of those processes”
“for me to get a bottle of corn oil or any of the other seed oils on your table, I have to do a lot of industrial processing. I have to heat these things up. I have to refine these oils. I have to use industrial grade solvents to extract them. It seems very likely that both of those processes”
“the actual processing of the seed oils removes oxidants and removes some impurities that are maybe negative.”
- Oct 7, 2026 5 new claims (The Peter Attia Drive, The Ultimate Human).
- Oct 7, 2026 Published: cleared the gate.
- Oct 7, 2026 Layne Norton moved from “industrial processing of seed oils is harmful.” to “No, processing removes impurities and does not harm health.”.
- Oct 7, 2026 Layne Norton (The Peter Attia Drive, 2026-01-19) addressed an argument by Peter Attia.
- Oct 7, 2026 Peter Attia (The Peter Attia Drive, 2026-01-19) addressed an argument by Layne Norton.
- Oct 7, 2026 7 new claims (Dr. Jockers Functional Nutrition, The Peter Attia Drive, DarkHorse Podcast, The Ultimate Human).
Published because: 3 shows, 2 positions, 269 days of debate. Questions publish only when claims come from at least three shows, at least two positions are held by different people, and the debate has lasted two weeks.
Pairs are matched by content across different episodes and shows; no exchange between these speakers took place unless both quotes come from the same episode.
The prose on this page is written by a model from the quotes shown, and every sentence of it rests on quotes you can open; sentences that could not be traced to a quote were removed before publishing. Positions are placed from each speaker's own words. Evidence labels say what the speaker cited, never whether it is true.
4 episodes behind this page
- 2026-07-09The Ultimate Human — 285. Your Skin Tells the Truth in Ways You Never Expected - Dr. Vali, Dr. Barbara Sturm, & Danica Patrick
- 2026-01-19The Peter Attia Drive — #380 ‒ The seed oil debate: are they uniquely harmful relative to other dietary fats? | Layne Norton, Ph.D.
- 2025-10-23The Ultimate Human — 212. Dr. Barbara Sturm: How to Heal the Skin from the Inside Out
- 2025-10-12DarkHorse Podcast — Seeds of Doubt: Nina Teicholz, PhD on DarkHorse
The week's bottom lines, in your inbox
One email a week: the stories that mattered and what they actually mean. Free.