If it isn’t the most crucial one, what are some other subreddits that contend?
There’s is no greater remedy of the body than abstaining from food and water. It is the only general cure-all for all chronic lifestyle diseases. Well, I suppose that’s not entirely true, the body is of course the one doing the curing, abstention is just a messenger to notify the cells that its time to get rid of waste and rejuvenate to optimal efficiency, which is as good a definition of health as I’ve heard.
What do you mean by “crucial”? There are plenty of healthy people who have never dry fasted a day in their lives. Dry fasting is a tool, so is regularly using a sauna, so is cold exposure, so is resistance training, so are medicinal mushrooms, etc … all have related subreddits.