I haven‘t quite read Levy‘s book yet. But „Death by Calcium“, I don‘t believe it. Andrew Saul reports annually: No Deaths from Minerals, Never.
http://orthomolecular.org/resources/omns/v13n02.shtml
According to Eaton and others, our ancestors consumed 2 grams of calcium daily. I can‘t achieve that.
And calcium is one of the 47 essential substances we need. If only one is missing, we are indeed dead. Death without calcium, I think.