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 3 days ago* (last edited 2 days 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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[–] psud@aussie.zone 3 points 2 days ago

Dr Mason is doctor enough to call out what is not scientifically proven. The only parts of this very short segment from a longer presentation that isn't demonstrated yet but science are:

  1. That people on low carb diets who avoid seed oils suffer less sunburn than those who eat seed oils; and
  2. A mechanism for seed oils to block the effect of vitamin D.

He clearly flagged those as anecdote and supposition so I'm not at all sure what your problem is.

The very short summary is "isn't it interesting that lots of people in this population claim to not get sunburnt, since this thing that other population eats and this population don't is known to stop parts of this system in the body, I wonder if it also blocks related thing"

There is nothing controversial there, it's a clearly stated hypothesis