[PepeGomez]

Nonsense. It only happens after prolonged massive intakes (A man who intentionally took 60mg/day for a year and 30mg for several years before that is one of the few examples found in literature.) and the signs are liver and kidney failure. It's completely unrealistic you could get that much from anything resembling normal food, vegan or otherwise.

[farresito]

It's perfectly realistic and more common than you think. There's plenty of evidence around which you can find with a simple google search.

http://www.westonaprice.org/modern-diseases/copper-zinc-imba...

[PepeGomez]

As far as my knowledge goes, that seems to be completely made up.