But back to the topic, there is no longer term data to show what impact the carnivore diet has on your health, but the Atkins diet, a less extreme version of it, showed a 5% increase in heart attacks for women in one very large scale study.
https://www.bmj.com/press-releases/...ficant-cardiovascular-risk-atkins-style-diets
You'd expect that to fall for people following an effective diet, to see a rise is a bad sign. Still I'm sure it's not a problem for men following the carnivore diet as men are famously not at risk for heart attacks.
I do find it interesting that the same people who promote the carnivore diet, which has no meaningful scientific testing, are normally the same people who object to medicines that have extensive testing. It's an odd disconnect.