Calcium exists in a 2:1 ratio to magnesium, and when magnesium levels drop, the body dumps calcium, accelerating bone degeneration.
"The problem is that calcium exists in a 2:1 ratio to magnesium. And when your magnesium levels fall off, you start dumping calcium. And guess where that shows up? You start seeing bone degeneration." (said at 0:07:00)
No published record matching the claim that calcium exists in a strict 2:1 physiological ratio to magnesium, or that dropping magnesium levels causes the body to dump calcium and accelerate bone degeneration, was located; this does not prove the claim false.