See post above re vitamin D
A paper containing lots of thought provoking information as to the issue of low magnesium intakes globally.
'Subclinical magnesium deficiency: a principal driver of cardiovascular disease and a public health crisis'
https://openheart.bmj.com/content/5/1/e000668
Of particular interest to females . . . a small part of the total data summarized on the wider issue
"Magnesium deficiency has been found in 84% of postmenopausal women with osteoporosis diagnosed by low magnesium trabecular bone content and Thoren’s magnesium load test."