and the 4th camp - minimalists. I find making what I call "healthy cutbacks" incredibly empowering. 2 years ago I stopped eating fish and meat and it was surprisingly easy, so I had to find another challenge. Then I heard about Wim Hof, (the Ice man) and I stopped having warm showers. I have to admit, I don't look forward to those icey blasts every morning but I feel great after I get out and have a coffee. A few months ago, I stopped having lunch during the week, despite regularly running and swimming during the day. I often eat nothing for 12 hours and feel much more alert and in control. Instead of having a couple of beers after work, I now only drink one glass of wine (a fine one). But god help me if I don't get that one glass after a hard day of self imposed deprivation! Recently I decided to learn a new cross-platform programming language, perhaps no surprise - I chose ANSI C.

That's one kind of ethical reason.

It can be, but I would assume from the organic movement that for others it is a belief in healthiness of unprocessed food.