While severe zinc deficiency can cause a variety of extreme symptoms, researchers estimate that a large percentage of the world's population may have a mild zinc deficiency. (wellnessmama.com)
Severe zinc deficiency in rats can alter brain neurotransmitter levels. (westonaprice.org)
The genetic disorder, Acrodermatitis Enteropathica, is a rare but lethal condition caused by severe zinc deficiency. (sciencedaily.com)