Vitamin D deficiency is probably playing a not insignificant part in what you're seeing.
Does anyone here think Australia is more polluted than say India?
And also all the top countries in that list are all part of the more developed world, where pollution levels in general are much less than say other parts of the world.
While pollution might still be an issue it could also be that people living in developed countries have more access to healthcare and so their detection rates are higher.
And fair enough, african countries might have undetected cancers and have people die of other disease before getting old enough for cancers. But I was comparing Umbria to Belgian Flanders which are both 1st world countries.
Like clockwork, every single health and diet story here gets vitamin D comments.