One can always find positive and negative outcomes related to any intervention to a biological system. Fasting is no exception.
The question is when and where is it beneficial, and what are the trade-offs. I'm sure if one has a clean, healthy diet, and consistent sleep and routine, it likely does not matter in the long run at what time one decides to eat or not eat. If the effect size were noticeable we'd have seen it already in smaller samples.
If one is overeating, or eating garbage all the time, then I'd hypothesize fasting to be beneficial by giving the biological system a break to try and bring itself back to a better steady-state without so much forced external input.
If one is overeating, or eating garbage all the time, then I'd hypothesize fasting to be beneficial by giving the biological system a break to try and bring itself back to a better steady-state without so much forced external input.