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Undernutrition and elevated blood lead levels: effects on psychomotor development among Jamaican children
J M Gardner1, S P Walker, S M Chang
1Tropical Metabolism Research Unit, University of the West Indies, Mona, Kingston, Jamaica. jgardner@infochan.com
Insights
Children with poor nutrition exposed to lead experienced greater psychomotor deficits. This highlights the critical interaction between lead exposure and nutritional status in early childhood development.
Area of Science:
- Environmental Health
- Pediatric Development
- Nutritional Science
Background:
- Elevated blood lead levels are a known neurotoxin affecting children's development.
- Nutritional status can influence a child's vulnerability to environmental toxins.
- The interaction between lead exposure and nutrition on psychomotor development requires further investigation.
Purpose of the Study:
- To investigate if nutritional status modifies the impact of elevated blood lead levels on children's psychomotor development.
- To compare developmental quotients (DQs) in lead-exposed versus unexposed children across different nutritional strata.
Main Methods:
- Cross-sectional study in Kingston, Jamaica, involving 111 children aged 3-6 years.
- Measurements included anthropometry, blood lead levels, hemoglobin, and developmental quotients (DQs).
- Social background and maternal factors were also assessed to control for confounding variables.
Main Results:
- Lead-exposed children exhibited significantly higher blood lead levels and lower DQs compared to unexposed children.
- The negative impact of lead exposure on DQs was substantially greater in undernourished children (deficit of 10.6 points) than in well-nourished children (deficit of 2 points).
- Homes of exposed children generally had poorer facilities, indicating potential co-exposure to other environmental stressors.
Conclusions:
- Undernourished children exposed to lead are at higher risk for significant psychomotor developmental deficits.
- Nutritional status is a critical factor that can exacerbate the adverse effects of lead exposure on child development.
- Public health interventions should consider nutritional support alongside lead abatement strategies for vulnerable populations.
Objective:
We examined whether or not the effect of elevated blood lead levels on children's psychomotor development was modified by their nutritional status.
Design:
Anthropometry, developmental quotients (DQs), blood lead levels and haemoglobin were measured in lead exposed and unexposed children with different levels of nutritional status. Social background and maternal height and verbal intelligence were also measured. Testers, anthropometrists and interviewers established reliabilities with a trainer before the study began.
Setting:
Children were from two suburban areas in Kingston, Jamaica. All measurements on the children were carried out at a research unit. Social background and maternal measurements were carried out at the children's homes.
Subjects:
The exposed group comprised 58 children (3-6 years) attending the same preschool which was situated in a lead contaminated environment. The unexposed group comprised 53 children attending a nearby preschool without lead contamination.
Results:
The exposed children had significantly higher blood lead levels and lower DQs, and their homes had poorer facilities than the unexposed children. The deficit in DQ was greater (10.6 points) among children with weight for height less than -1 SD (National Center for Health Statistics references) than among better nourished children (2 points).
Conclusions:
Undernourished children exposed to lead may have more serious developmental deficits than better nourished children.