Last time I are pork/red meat was beginning December last year, but I did eat chicken, though not every week.
I could sum it up in two sentences. a) It's been a struggle to keep on weight. b) It's boring hence I'm going back to a Mediterranean diet.
I substituted with cheese and eggs and I ate fish 2-3 times a week, but still would lose weight easily hence if you are
fat overweight, it probably makes sense to eat like a vegetarian from time to time, but if you are a normal weight, you could easily become underweight.
Despite what carnivore/paleo crowd tell you, carbs don't exactly make you fat unless you eat like a ton of them. I was the skinniest when also restricting animal fat, which was downright scary, so I went back to eating butter and full fat yogurt, but even eating cake nearly every day didn't quite help.
I didn't exactly miss red meat, but got bored from building my meals around eggs and cottage cheese, if you know what I mean:)
So that's my experiences so far...