How does a dietary intake of 100% animal fat mimic fasting?
I don't know why there is even a low-carb/high-carb debate! The large majority of studies I have seen point to a balanced diet of carbs, fats, and proteins. As a general rule, extremes are never good. Naturally we want to intake the foods that science has found to be the healthiest for us to eat. Now when you look at a steak and compare it to an orange, you see a protein and a carb. But you also see the nutrients contained in those calories. An orange has many more vitamins, minerals than the steak does, and also contains fiber and phytochemicals, both of which have a long history of promoting human health.
So what is healthier, a carb or a protein? Well obviously you don't want to eat just one, but I would certainly suggest eating many more oranges than steaks...