When you don't have enough Minerals in your diet heavy metals can easily bind to mineral receptors and be absorbed...
and then your body is trapped in a cycle of biochemical warfare against itself.
Once you are toxic in heavy metals like (unbound) Iron, caused by a toxic environment e.g. bad food, drugs (inclusive prescription drugs) etc. your body has to fight 24/7 to get rid of all the poison again but at the same time it will never be allowed to absorb a sufficient amount of e.g. Magnesium to fight the bad boys. That's when chronic inflammation, disease (cancer, M$, Alzheimers etc.) & death does happen.