Nobody knows who or who should not be on a Carnivore diet yet, most of modern culture has been heavily biased towards a plant based diet and little about the carnivore diet and its effect on modern people has been studied in the last 100 years.
I personally have thrived on the carnivore diet, I feel better than ever. My mind is clear, I have not caught the flu or a cold or any other illness in the last two years. My health and lab test are very good.