Re:Ubiquitous Medieval Pigs
by rom16384 on Tuesday November 03, 2020 @05:46AM
(#24978359)
"Protein poisoning (also referred to colloquially as rabbit starvation, mal de caribou, or fat starvation) refers to an unverified acute form of malnutrition that some have speculated may be caused by a diet deficient in fat, where excessive lean meat is consumed", from https://en.wikipedia.org/wiki/Rabbit_starvation
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This sounds like confirmation bias, though (you can find a reason not to eat anything if you look closely enough). It is also highly speculative.
I think from an ethnographic point of view, cultural reasons are perfectly plausible, in the same way some people now refuse to eat horse, veal, or indeed rabbit.