Monica, re ‘rich vs poor Mediterranean diets’ you’ve reminded me of the early 70s, when civil engineer dh was first working on a bachelor basis, in a newly ‘opened up’ so to speak Oman. Facilities were extremely basic - his first car was reg. 603, i.e. the 603rd in the whole country.
The co. he worked for was from a Mediterranean country, ditto most of the workforce, and dh said that if e.g. a mason or carpenter wasn’t very good at his job, they’d put him in the bachelor mess (nearly all the men were on a bachelor basis at the time) and get him to cook!
So virtually all their meals consisted of ‘beans and oil’ with bread, which was apparently considered much like (albeit basic) home cooking and so acceptable to most. Fresh fruit and veg were then scarce and hard to come by.
Needless to say, dh and the odd fellow Brit weren’t too happy with this, I often think this is at least one reason why he proposed on a subsequent trip home - on a married basis he’d be given a (prefab) house and I’d be doing the cooking!*
(We had to be married, or I’d never have been given the ‘no objection’ certificate for my passport.)
*before anyone asks why he wouldn’t do it, he was working 12 hour days, 6 days a week - everything was wanted by the new Sultan ‘yesterday’.