Lead in kids’ blood linked with behavioral and emotional problems

Emotional and behavioral problems show up even with low exposure to
lead, and as blood lead levels increase in children, so do the
problems, according to research funded by the National Institute of
Environmental Health Sciences (NIEHS), part of the National Institutes
of Health. The results were published online June 30 in the journal
JAMA Pediatrics.
“This research focused on lower blood lead levels than
most other studies and adds more evidence that there is no safe lead
level,” explained NIEHS Health Scientist Administrator Kimberly Gray,
Ph.D. “It is important to continue to study lead exposure in children
around the world, and to fully understand short-term and long-term
behavioral changes across developmental milestones. It is
well-documented that lead exposure lowers the IQ of children.” 
Blood lead concentrations measured in more than 1,300
preschool children in China were associated with increased risk of
behavioral and emotional problems, such as being anxious, depressed, or
aggressive. The average blood lead level in the children was 6.4
micrograms per deciliter.

Here's the paper:-

Blood Lead Concentrations and Children’s Behavioral and Emotional ProblemsA Cohort Study

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