this post was submitted on 17 Jun 2026
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[YT short] Dr Paul Mason on vitamin D seed, oil, sunburn (youtu.be)
submitted 1 day ago* (last edited 7 minutes ago) by psud@aussie.zone to c/carnivore@discuss.online
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Do seed oils block cholesterol to vitamin D? Vitamin D as sunscreen Sunburn resistance of people who don't eat seed oils

Summary by Google's LLMIn this video clip from Low Carb Down Under, Dr. Paul Mason presents a theory linking the consumption of industrial seed oils to a higher susceptibility to sunburn

Key Arguments and Claims:

  • Vitamin D as Natural Sunscreen: Dr. Mason states that the body naturally vitamin D as a protective shield against UV/UVB radiation damage to DNA, rather than strictly for bone health
  • The Cholesterol Connection: He references Ancel Keys' historical "Seven Countries Study", highlighting a data point that individuals with higher sun exposure had lower blood cholesterol levels. He explains this occurs because the body uses cholesterol to synthesize vitamin D
  • Interference by Plant Sterols: He argues that plant sterols (phytosterols) absorbed from dietary seed oils interfere with normal cholesterol chemistry, specifically disrupting the skin’s ability to synthesize vitamin D
  • Anecdotal Evidence: While acknowledging the evidence is largely anecdotal, he points out that a vast number of individuals on ketogenic internet forums report a noticeable resistance to sunburn after completely eliminating seed oils from their diet.
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[–] xep@discuss.online 2 points 21 hours ago* (last edited 21 hours ago)

Humans produce melanin as natural sunscreen, not vitamin D

Please see

https://www.explorationpub.com/Journals/em/Article/1001225

While UV-induced photoaging causes a detrimental impact on the skin, the UVB induced cutaneous synthesis of vitamin D protects the skin from various stresses.

The paper covers some of the mechanisms, it's a good read and will improve your understanding of our body. Melanin isn't the only protective factor.

https://pubmed.ncbi.nlm.nih.gov/23069805

We present data to show that 1,25(OH)(2)D(3) protects skin cells from at least three forms of UV-induced DNA damage, and provide further evidence to support the proposal that a reduction in RNS by 1,25(OH)(2)D(3) is a likely mechanism for its photoprotective effect against oxidative and nitrative DNA damage, as well as cyclobutane pyrimidine dimers.

Not open access, so you'll have to find the full paper yourself.