I have been working with ketosis for 4 years.
Carnivore since middle of December, not looking back now.
Growing muscle mass, while staying incredibly shredded at 82kg at the moment. Deadlifting over triple my bodyweight and going for the 80kg-85kg British deadlift record. Prior to carnivore, my lifts were not going up and only slowly when improving. Mental energy and focus for the lifts has sky rocketed since meat only.
Skin is completely clear, immune system is optimum, recovery every night from training 2-3 times a day and energy has never been higher.