Tom Neltner, J.D., Chemicals Policy Director and Maricel Maffini, Ph.D., Consultant
The Food and Drug Administration (FDA) released a study in April estimating young children’s exposure to lead and cadmium from their diets and identifying food groups that are a significant source of these heavy metals. The study used data from the agency’s Total Diet Study (TDS) program for 2014 to 2016 and the Center for Disease Control and Prevention’s (CDC) What We Eat in America (WWEIA) Survey for 2009 to 2014.[1]
The study is a reminder of how pervasive heavy metals are in children’s diets and that, while the levels are relatively low, the cumulative exposure is significant. Based on FDA’s analysis (Table 1 below), we estimate that about 2.2 million children exceeded the agency’s maximum daily intake (MDI) for lead at a given time. The results for cadmium are new and worrisome, with estimated daily intake (EDI) levels that are 3 to 4 times greater than lead. And while FDA has not yet set an MDI limit for cadmium, the average young child exceeds most of the relevant daily exposure limits set by other agencies. Clearly, cadmium warrants greater attention, but note that the evidence of neurotoxicity is still emerging.
Table 1: Young children’s estimated dietary intake (EDI) of lead and cadmium based on FDA’s TDS results for years 2014 to 2016 (based on hybrid method)
Age Group | Lead Mean EDI | Lead 90th Percentile EDI | Cadmium Mean EDI | Cadmium 90th Percentile EDI |
---|---|---|---|---|
1-6 years | 1.8 µg/day | 2.9 µg/day | 6.8 µg/day | 11.0 µg/day |
1-3 years | 1.7 µg/day | 2.6 µg/day | 5.8 µg/day | 9.7 µg/day |
4-6 years | 2.0 µg/day | 3.1 µg/day | 7.8 µg/day | 12.1 µg/day |
Limits | FDA’s MDI is 3.0 | No MDL set by FDA. Intake exceeded most limits set by other agencies |