There's a woman who been doing carnivore for 13 years, also a family for 14 years only steak and a few others, there's a few who had severe skin issues to the point of being in the hospital that got way better on the carnivore diet. Along with a few carnivore doctors out there.
[media=https://youtu.be/CZ-qwRGNgjo]
This girl had major skin problems and went carnivore to heal her skin:
[media=https://youtu.be/ev42Uro5bcI]
[media=https://youtu.be/xiVWxU-XYpM]
As for my thoughts, I think that some of these people have unknown autoimmune conditions and when they simply cut out everything, I think it just helped them because a lot of these people seem to have the same autoimmune conditions in the skin especially.
I've been doing a semi keto/semi carnivore diet and I think it's really great, my satiated levels are through the roof. I kind of do half and half, that way I can have a higher meat diet but with a few favorite fruits in.
So as for the pros of even a modified carnivore diet, you feel full for longer.
Cons I would say electrolyte imbalances due to no carbs but that can be easily replaced with a supplement providing potassium doesn't interfere with any meds you're taking, I'd check. Since doing my diet here, I take Dr. Berg's electrolyte supplement and it's pretty good, it has 1000 mg potassium in there so I take two servings a day cos we need 4,800mg total daily.
It's not really a big con but you can easily have imbalances because carbs hold onto electrolytes but again, it's nothing major because it's a simple fix. I do regular table salt (just a teaspoon) and the electrolyte powder. Haven't felt anything bad yet.