interesting things to consider ..:
Nutrition and metal toxicity.http://ajcn.nutrition.org/content/61/3/646S.short
Dietary deficiencies of calcium, iron, and zinc enhance the effects of lead on cognitive and behavioral development. Iron deficiency increases the gastrointestinal absorption of cadmium, and cadmium competes with zinc for binding sites on metallothionein, which is important in the storage and transport of zinc during development. Selenium protects from mercury and methyl mercury toxicity by preventing damage from free radicals or by forming inactive selenium mercury complexes.
TOXIC AND ESSENTIAL METAL INTERACTIONShttp://www.annualreviews.org/doi/abs/10 ... tr.17.1.37
Infantile zinc deficiency: Association with autism spectrum disordershttp://www.nature.com/srep/2011/111103/ ... 129.html?.
Recently, dietary restriction-induced zinc deficiency has been reported to up-regulate intestinal zinc-importer (Zip4) and induce the increase in Zip4 protein located to the plasma membrane of enterocytes43. This adoptive [sic] response to zinc deficiency is known to lead to increasing in the risk of high-uptake of toxic metals such as cadmium and lead. Thus, infants with zinc deficiency are liable to be exposed to increased risk of absorbing high amount of toxic metals and retaining them in their body. These findings suggest that the increased risk of toxic metal burdens attendant on the infantile zinc deficiency may also contribute to the pathogenesis of autistic spectrum disorders. ... patients with zinc deficiency have a low excretion ability of toxic metals and result in a higher body burden with them.