I thought Mediterranean cuisine was full of lamb. Where did the author find less meat? I am reminded of the line in My Big Fat Greek Wedding where the soon to be groom announced he was a vegetarian and there was absolute silence in the room. Then the aunt said not to worry she will make lamb for him.
Lamb is eaten in parts of Italy, although is very rarely seen along the coasts, where seafood (and sometimes pork) is king.
Meat is a part of the Mediterranean diet, but it's more of a condiment.