My first thought was that this was an announcement that IS was reverting to eating meat
I'm not really sure, I think there is probably as many reasons why as there are individuals who go back to eating meat. Now that I think about it though, I know tonnes of people who have been vegetarian and no longer are (and also tonnes of vegetarians). There is kind of two cateogories: people who were passionate about AR/environment, and people who weren't really that passionate in the first place. People who were passionate, it seems mostly be to do with knowledge/planning/health/will-power. People who weren't passionate, the reasons seem to be varied. Some that I can think of:
- Finding vegetarianism difficult to maintain due to lack of knowledge/planning in diet. I know quite a few people who fall into this category: someone in my family developed anemia and started eating meat after years of vegetarianism, other people just try it for a few months by cutting the meat out of their diet (without replacing it with anything) and find it unsustainable (not surprisingly).
- Going vegetarian was a phase/part of growing up. It kind of makes me cringe to say that, since it's what everybody said I was doing when I went vegetarian at 11, I was very affronted. But nonetheless, I think that flirting with a different diet is, for some young people, part of finding out who you are. I know several people who were vegetarian (and a couple who were vegan) for months or years as young adults. For some it was to do with image, or rebellion, and others felt strongly about animal issues for some time and then, less so.
- I know somebody who was raised vegetarian, and started eating meat as a teenager. So I guess that's the opposite of what I wrote above!
- I know quite a lot of people who went vegetarian because close friends or partners were vegetarian, and then stopped being vegetarian after breaking up. I'm not really clear on the reasons they went vegetarian/stopped being vegetarian beyond that though.
- I know a few people who stopped eating meat as part of a diet, and returned when they gave up on the diet.
- Some people (more friends of friends than people I know) were vegetarian, got drunk, ate meat, and then never returned to vegetarianism.