Do you have any links where I could read more? I do fast now and then, I did it more strictly in the past, but I am naturally pretty skinny so I don't want to

Do you have any links where I could read more? I do fast now and then, I did it more strictly in the past, but I am naturally pretty skinny so I don't want to loose weight. These days I can do 18 hours without too much effort, but it doesn't feel as beneficial as when I would do 36 hours (admittedly with 600 calories, based loosely around teh 5-2 diet). There are more benefits than just autophagy.