My sons and their girlfriends recently came to stay at our place in France. The girls are genuinely nice people, and one of them is very strictly vegetarian. As someone with always a few slabs of emergency steaks in the freezer, vegetarianism posed a few logistical issues during mealtimes but nothing we could not manage, especially as she very kindly conjured up a very delicious vegetarian dinner for everyone one evening.
It did, however, provoke an interest in what happens when people diligently decline to eat meat (I had not met a single vegetarian in France before) – and research highlighted some interesting wide-ranging findings which may also help non-vegetarians like me.