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Iron is a critical component in Hemoglobin, a protein composed molecule in Red Blood cells. If the body would instantly lose all it's iron contents, one of the consequences would be the partial unfolding of Hemoglobin molecules and they would lose their ability to exchange O2 at the blood-lung barrier or hold on to the O2 in the bloodstream. Basically, your whole body would start to become oxygen deprived and die.
As mentioned, iron ions are a critical component of haemoglobin and myoglobin. Without it you would die. This is the case for other organisms that utilise haem groups to carry oxygen. Metal ions have many other purposes in the body, however. For example, there are a group of critical enzymes in the body called the "zinc-finger" enzymes, which utilise zinc ions to help co-ordinate reactions. Likewise, there are many enzymes that utilise magnesium, manganese, copper or zinc. Removal of any of these metal ions from the body would probably cause death in one way or another. On a slight sidenote, in relation to the magnetism thing, through fMRI (functional magnetic resonance imaging) it is possible to detect minute changes in the conformation of the haem group when oxygen is bound -- fMRI can distinguish between oxygenated and de-oxygenated blood flow, and highlight regions where blood supply is increased (eg in the brain). This is related to magnetics.
Some cells- like white blood cells would get by without myoglobin or haemoglobin as long as they were in a medium with enough dissolved oxygen.But removing the iron from their cytochromes would kill them anyway.
Precious metals tend to be relatively unreactive, when compared to other transition metals. For this reason, in enzymes it's probably more beneficial to have ions of different metals incorporated (metals in enzymes are used to move electrons around). There might be other reasons too. Having said that, platinum is a component of the chemotherapy drug cisplatin.
In cisplatin the platinum is being used to form crosslinks between DNA strands.Cancer cells replicate quickly, and hence the DNA also replicates frequently. By forming links between the strands, cisplatin stops this from happening. This triggers the cell to try and repair the damage, and it can't do it, for whatever reason. I don't know whether the bonds with platinum can't be broken, or whether enzyme access to the DNA is blocked completely. Regardless, because it can't fix the problem the cell initiates apoptosis and kills itself. Pretty cool
The person would not only "turn blue", but also lose the healthy pinkish hue caused by the iron in the hemoglobin, resulting in a stranger blue hue ... like the Blue Man Group?