Hmmmm I wonder what the minimum fast is to trigger Autophagy. I'm still getting the benefits today - able to get in and out of the car without the usual agony
From the videos I have seen by J Fung. It can be as little as 12hrs.
He believes there is a trigger based on protein.
From that I take it to be like rebuilding a wall. The builder will use new bricks because its easy. If he runs out of bricks he will clean up and recycle old ones that he can make work.
The body is doing the same. Dr J also said that autophagy may well be triggered on omad as the 23hr spread of the mini fast could well mean several hours a day with the body repairing/adjusting. I would guess you should cut down on protein to help kick things off.
I wonder if there is any priority to what the body works on. Maybe it starts in the brain and works out so joints etc are later on the list blurring any obvious benefits. But with a longer fast like ours. More work is done.
I may have it utterly wrong but that is my take.