Stumbled on this on this old paper, 1988 and I haven’t seen it referenced here yet, though perhaps I’ve missed it since I haven’t immersed myself in carnivorism. I found it interesting despite the limitations of small sample size and being observational/speculative rather than experimental.
https://sci-hub.tw/10.1097/00007611-198801000-00013
Conclusion:
It has become customary to blame high serum cholesterol levels on the ingestion of animal fat. Perhaps the real culprit is an unknown factor in grains, milk products, or sugar that interferes with the metabolism of animal fat.