You assume these types of questions have answers, but they don't. Individuals don't get the same results, as out bodies differ in all kinds of ways and there is no normal. However, that being said, most likely, no permanent damage has been done, and you might as well just assume that's the case. Even if we just guess that maybe some was done, you've still postponed when that would manifest itself and the way life works is, we all die, and the trick is, die before this kind of thing happens because you've already lived out your life expectancy, whatever that turns out to be before the bad stuff happens. In other words, none of us can eat in a way that makes us live forever, but we can live out lives in a way that gives us a better chance of living as long as we were programmed to without something intervening and cutting that short. And while we're alive, we want to be as healthy as we can be for as long as possible so life is just more pleasant. Now, I will tell you, I don't think there is such a thing as a keto diet, it's a fad diet, and the results won't necessarily continue or last. If you want permanent benefits, when you get as much as you can from this fad diet, as it seems to be working for you right now, switch to a healthy diet that isn't a high protein diet. You want a good old balanced diet based on whole grains, veggies, moderate consumption of animal food and that mostly from the ocean, and in that veggie class are good plant protein sources such as nuts and legumes. Start an exercise program you can handle and slowly increase it to a level that will not harm you but help you burn off what you eat and keep your organs, digestion, and heart strong. More than that science doesn't know. Don't know why you're taking the collagen unless you have joint pain or connective tissue problems. Don't completely deprive yourself of what you enjoy or you won't have any fun and won't stick to it. You're doing great, just get better at it, and those veggies can be made to taste a lot better if you buy organically grown and learn how to prepare them in a way you like. Don't know what supplements you're taking, but those are more for prophylactic purposes unless you are treating a problem with them and know how to do that. It's much more the exercise and the food. Keep on going, and give yourself a good clap on the back. Bravo.