[Zababa]

> People saying "oh but it's natural" are also making a naturalistic fallacy. It was also "natural" for much of human history to be infested with parasites and ravaged by disease. Natural is not necessarily good.

I think you are committing a fallacy here too. The naturalistic appeal is not about how things were before, but in what conditions we evolved. For example, we could try to eliminate every single germ everywhere, but that would make our immune system weaker, because our immune system can adapt itself. Vaccines are a way of leveraging that knowledge about our immune systems. Same thing about light: we spent most of our evolution time following the Sun cycles, and now we see that people that work shift hours are in a worse condition than people that don't.

A big difference between the way we fast today and the way people may have faster before is that we don't have to hunt or gather for our food, we have certainty about the presence of food at the end of a fast. Though by writing that, I wonder if early humans felt constantly the need for food and the fear of not finding it. I don't even know if animals do.