Infants' and young children's dietary exposures to lead and cadmium: FDA total diet study 2018-2020

Food can be a source of lead and cadmium exposure for infants and children. Employing a semi-probabilistic approach, dietary exposures to lead and cadmium were assessed for infants 0-11 months (excluding human milk-fed infants) and children 1-6 years using U.S. total diet study data from 2018 to 2020 and food consumption data from 2015 to 2018. Estimated mean lead and cadmium exposures range from 0.7-3.6 µg/day to 0.18-0.47 µg/kg bw/day, respectively, depending on the age group and method for handling non-detected values. Dietary exposures to lead and cadmium are slightly lower and slightly higher than our estimates published in 2019. In addition to the use of more recent datasets for consumption and contamination, differences may be due to the use of refined exposure assessment methodology, particularly a new system of mapping contamination data to intake data. The processed baby food and infant formula food group is the major contributor to lead and cadmium exposure, driven by intake, among infants who do not consume human milk. The food groups contributing most to children's lead and cadmium exposure are grains/baking, dairy and fruit and grains/baking and vegetables, respectively. This work will inform FDA initiatives such as closer to zero, including research needs and regulatory priorities.