Recall that autophagy is when we reclaim old damaged cells. This process happens at all times in the body, to greater or lesser extents. On a small extended fast there is a notable uptick. This makes sense, the body needs material, and why not kill off what isn’t functioning for spare parts. Having a minuscule amount of calories simply can’t replace the need for autophagy in the first place and so even if there is a small dip, it should be negligible.