Calcium, magnesium, phosphorous, iron are the good metals, serving many valuable functions in the body.
The problem with heavy metals like lead, mercury and others is that they can replace the good metals in the body.
Cadmium can replace zinc, and lead displaces calcium, these are just two examples.
So if a heavy metal replaces a good mineral in a protein, enzyme or cofactor, it then becomes dysfunctional.
In this video, Biochemist, Rik Deitsch gives the example of a zinc finger protein. If the zinc gets displaced by cadmium, it can no longer do it’s job. This has an impact on the immune system.
Fatigue and lack of energy is another of the many problems heavy metals can contribute to in the body.