system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Zinc, iron and copper are heavy metals. Does the body ever fully heal from poisoning of these metals?

Since zinc, iron and copper are heavy metals, the body has no mechanisms to get rid of them if they're in excess, and they can lead to poisoning.

Does the body ever fully recover from poisoning of these metals, then? Some heavy metals, like gadolinium given in MRIs, might stick around the body permanently. Is it the same with these heavy metals necessary for life?
gpt
Just because something is a metal, and in the general sense "heavy" does not magically make it a "heavy metal". Heavy metal poisoning generally refers to lead, cadmium, mercury, and arsenic.

your body CAN excrete zinc, copper, and iron, and of course you need a certain amount of these metals in your body to live. Iron is a very important part of your blood, so you don't die. 

A distinction must be made between normal dietary levels of these metals, chronic toxic levels, acute toxic levels, and excretion disorders. 

Copper, Zinc, and Iron have very *low* toxicity, so you really need a heck of a lot of iron (or copper or zinc) *or* an abnormality in how your body disposes of excess metal. Wilson's disease causes a buildup of excess copper, for instance. 

tldr; those metals are not "heavy metals" and are not "toxic"