My father is in his mid 60's and has successfuly transitioned from a SAD-ish diet into low-carb/Primal.
He is a doctor and open-minded enough to read the evidence provided against the SAD and for Paleo. Now he is feeling much better and is (slowly) losing weight.
Throughout his life, my father developed asthma and issues with his knee as a result of the consumption of cortisone (avascular necrosis). He got a small prosthesis in the knee and he is recovering, but seems to be stuck in below 100%, which also limits his ability to work out. He still has weight to lose as well.
Although his dietary habits have changed dramatically for the good, I am trying to find some ways in which he can gradually further tweak his diet/lifestyle in order to achieve an 100% joint recovery and a healthier %BF.
He still eats some legumes and diary. The problem is that pushing for perfection might prove to be too overwhelming and thus discouraging, so the more gradual the changes, the better.
In order of priority, which changes should he start implementing in order to completely fix his knee, and in the long-term, improve his %BF?
I am particularly ignorant in what kind of exercises he could start doing with his knee (at-home, no-sophisticated-equipment kind of workouts).
Any feedback would be greatly appreciated.