Here is a lady that has been meat only carnivore for 16 years and mostly carnivore for 21 years. Listen to the first 5 minutes for her background and then if you are interested enough the rest of the presentation. It seems it has served her well. 

Certainly not for everyone, but for some people with health problems might be worth considering.

My wife really likes listening to her because of her energy and positive outlook.

This interview is about another carnivore that had high cholesterol and suffered heart problems. She is interviewing a heart doctor.

https://www.youtube.com/watch?v=C29b1QKFJAE#mce_temp_url#

Edit to add: After the 5 minute mark he talks about patients who are long term diabetics still having insulin resistance even after being carnivore for 5 years. I am pretty sure I am still somewhat insulin resistant from my 35 or so years being diabetic even though I have been low carb and off insulin shots for well over 5 years now. I think that is the reason my fasting blood sugars are still higher than they should be based on the few carbs I eat.