> With regard to magnesium, he mentioned that the RDA is too low, that
magnesium consumption in the US
 > has drastically dropped in the past 35 years (why?)

www.beyondveg.com/cordain-l/prot-calc/prot-calcium-loss-1a.shtml
Are Higher Protein
Intakes Responsible for Excessive
Calcium Excretion?

Rob