I'm egg-adapted myself.

How awesome is fat though, it is hard to overeat it, but French cultured butter with sea salt crystals really puts this to the test.

In all seriousness though, I'd consider "adapted" as something somebody is comfortable and performant with. Personally, I eat my fatty food, and then I ask things of my body and I get them. Could my peak wattage be 5% higher on carbs? It is possible. Could I tell? Most likely not. Then there is endurance, recovery, rinse and repeat, logistics of nutrition, all of which become ridiculously easier/better.