According to an analysis released Thursday by the nonprofit advocacy group, the Environmental Defense Fund, twenty percent of 2,164 baby foods sampled between 2003 and 2013 by the Food and Drug Administration tested positive for lead. Ars Technica reports: Lead is a neurotoxin. Exposure at a young age can permanently affect a developing brain, causing lifelong behavioral problems and lower IQ. Though the levels in the baby food were generally below what the FDA considers unsafe, the agency's standards are decades old. The latest research suggests that there is no safe level of lead for children. Yet the Environmental Protection Agency this year has estimated that more than five percent of U.S. children (more than a million) get more than the FDA's recommended limit of lead from their diet. The products most often found to contain lead were fruit juices, root vegetable-based foods, and certain cookies, such as teething biscuits, the EDF reports. Oddly, the presence of lead was more common in baby foods than in the same foods marketed for adults. For instance, only 25 percent of regular apple juice tested positive for lead, while 55 percent of apple juices marketed for babies contained lead. Overall, only 14 percent of adult foods tested contained lead. The findings come from data collected in the FDA's annual survey of foods, called the Total Diet Survey, which the agency has run since the 1970s. Each year, the agency samples 280 types of foods from three different cities across the country, tracking nutrients, metals, pesticides, and other contaminants.