Theodore Dalrymple found scurvy and other nutrient-deficiency diseases among the white underclass in Britain. He said many of them were healthy only when they were in jail!
That’s interesting.
Can’t say the group you mention in Britain applies to Australia. We haven’t done a full study in Australia about affected, specific demographics. Not that I’m aware of so far. A full study is can be expensive too. Though reasons I mentioned before are key ones in Australia, and pretty much apply overall.