Personally I think there's a dangerous trend with greys wherein people are pushing a lot of protein and fat with greys because of their (as far as we know) diet in the wild.
Whatever wild greys may eat, they are not eating for longevity but for day-to-day survival and are much more active than 99.9% of captive greys. I know that for Jacko, despite all the 'bbbbbut Harrisons is vet-recommended' that she developed fatty blood on it and that was that.
Jacko no longer gets any sort of oil, animal protein and I've pretty much banned sunflower etc seeds.
It comes too late for her to protect her, unfortunately, but my next greys (as I will not keep a single bird again) will eat the same. Low fat, vegan and lots of fresh veggies etc.
Alex actually ate a lot of sunflower seeds, peanuts and also ate for many years Harrisons High-Potency.
He also fought Aspergillosis. I also wonder about what was, in many ways, a lonely, sedentary and restricted life.
There was also a study years ago that among other things social isolation (and interestingly groups compared were pair-housed birds vs single birds) actively shortens telomeres in greys, shortened telomeres increase aging and increase disease incidence and affect mortality.
It reaffirms my belief that, honestly, what we ask of parrots to keep them/the lifestyles we subject them to, are clearly harmful to them and are killing them. All the love in the world does not change the fact that our singly-kept, often clipped, indoor companion parrots are not made to live like that.
