2001o-549 2011b-955 analysis biochemicalphenomena biogeochemicalcycles biologicalavailability control diet enrichedfoods environmentalaspects environmentalexposure food healthaspects inadulthood malnutrition micronutrients nutrition nutritionalphysiologicalphenomena nutritionalrequirements nutritiondisorders prevention traceelements traceelementsinthebody vitaminsinhumannutrition wd100