EDF Health

New EPA model enables comparison of various sources of childhood exposure to lead

By Tom Neltner, Senior Director, Safer Chemicals Initiative / Published: September 14, 2017

Tom Neltner, J.D., is Chemicals Policy Director and Dr. Ananya Roy is Health Scientist

This week, Environmental Health Perspectives published an important article by scientists at the Environmental Protection Agency (EPA) that sheds important light on the various sources of children’s lead exposure. Led by Valerie Zaltarian, the article shares an innovative multimedia model to quantify and compare relative contributions of lead from air, soil/dust, water and food to children’s blood lead level. The model couples existing SHEDS and IEUBK models to predict blood lead levels using information on concentrations of lead in different sources, intake and gut absorption. The predicted blood lead levels compared well with observed levels in the National Health and Nutrition Evaluation Survey population. Given the variety of independent sources of lead exposure, the model provides a critical tool that public health professionals can use to set priorities and evaluate the impact of various potential standards for all children and not just those with the greatest exposure.

This peer-reviewed article builds on a draft report EPA released in January 2017 evaluating different approaches to setting a health-based benchmark for lead in drinking water. The report has provided a wealth of insight into a complicated topic. Earlier this year, we used it to show that formula-fed infants get most of their lead exposure from water and toddlers from food, while the main source of lead for the highest exposed children is soil and dust. In our February blog, we provided our assessment of a health-based benchmark for lead in drinking water and explained how public health professionals could use it to evaluate homes. The information was also critical to identifying lead in food as an overlooked, but meaningful, source of children’s exposure to lead.

The new article reaffirms the analysis in the January 2017 EPA report and highlights that evaluating source contribution to blood lead in isolation versus aggregating across all sources can lead to very different answers and priorities. A health-based benchmark for lead in drinking water could vary from 0 to 46 ppb depending on age and whether all other sources of lead are considered. For example, a health-based benchmark for infants (birth to six months old) would be 4 ppb or 13 ppb depending on whether or not you consider all sources of exposure.

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Also posted in Drinking water, Emerging science, Health policy, Lead / Tagged , , , , , , , , | Authors: / Comments are closed

Lead in food – An overlooked, but meaningful, source of children’s exposure to lead

By Tom Neltner, Senior Director, Safer Chemicals Initiative / Published: June 15, 2017

Tom Neltner, J.D., Chemicals Policy Director and Maricel Maffini, Ph.D., Consultant

By now, it is well known that lead exposure is a significant human health concern, especially for young children. While most of the discussion about lead exposure has involved paint, drinking water, and contaminated soil or dust where young children live, play, and learn, EDF’s new report shows reason to pay more attention to another source: our food.

Until recently, we have known very little about the contribution of food to children’s lead exposure. In January 2017, an Environmental Protection Agency (EPA) draft report indicated that food is a meaningful source of children’s exposure to lead. Using EPA’s data, we estimated that over 1 million young children consume more lead than what the Food and Drug Administration (FDA) considers acceptable for children to eat every day. From EPA’s analysis, we calculated that  that if lead in food were eliminated, millions of children would live healthier lives, and the total societal economic benefit would exceed $27 billion a year in increased lifetime earnings resulting from the impact of lead on children’s IQ.

To better understand the issue of lead in food, EDF evaluated over a decade’s worth of data collected and analyzed by the FDA as part of the agency’s Total Diet Study (TDS). Since the 1970s, the TDS has tracked metals, pesticides, and nutrients in up to 280 types of food yearly.

What did we find?

Overall, 20% of 2,164 baby food samples and 14% of the other 10,064 food samples had detectable levels of lead. At least one sample in 52 of the 57 types of baby food analyzed by FDA had detectable levels of lead in it. Lead was most commonly found in the following baby foods:

  • Fruit juices: 89% of 44 grape juice samples contained detectable levels of lead, mixed fruit (67% of 111 samples), apple (55% of 44 samples), and pear (45% of 44 samples)
  • Root vegetables: Sweet potatoes (86% of 44 samples) and carrots (43% of 44 samples)
  • Cookies: Arrowroot cookies (64% of 44 samples) and teething biscuits (47% of 43 samples)

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Toxic secrets in our food? EDF joins in lawsuit aimed at protecting food safety

By Jack Pratt / Published: May 22, 2017

Today, Environmental Defense Fund joined other groups in challenging a Food and Drug Administration (FDA) rule that allows chemical and food manufacturers to decide for themselves – in secret – what chemicals and food additives can be added to foods. The practice puts our health at risk and does not fulfill Congress’ requirement that FDA determine that chemical additives are safe before they can be used in food.

Americans would be shocked to learn that food companies routinely add novel chemicals to our food without first getting FDA approval. In doing so, the companies are exploiting a loophole exempting ingredients “Generally Recognized as Safe” (GRAS) from formal FDA review and approval.

Originally intended for ingredients like vinegar and olive oil, industry now abuses the GRAS loophole by bypassing FDA review and making safety determinations in secret. The alarming result: even FDA does not know what is in our food. In fact, FDA has no way to know what chemicals are actually being used in which food or in what quantities—even in baby food.

Last year, the FDA issued a final rule formalizing this outrageous practice. We described this decision as a lost opportunity for safer food additives when the decision was made. Today, EDF and our colleagues at the Center for Food Safety (CFS), Breast Cancer Prevention Partners, Center for Science in the Public Interest, and Environmental Working Group, represented by CFS and the environmental law firm Earthjustice, joined in filing suit against the FDA for unconstitutionally and illegally delegating that authority to self-interested food and chemical manufacturers.

It is disappointing that the groups were forced to take legal action. In addition to being a bad policy that doesn’t comply with law, or protect public health, the FDA is oddly out of touch with public sentiment. Just last week an industry funded survey showed overwhelming consumer concern about chemicals in food, including cancer causing chemicals, while showing diminished confidence in the food supply. This continues a trend that has been building for years. Food companies would be wise to take notice: adding secret chemicals without FDA scientific review to our food is no way to improve confidence in their products.

But with thousands of secret chemicals in our food, we can’t wait for industry or FDA to wise up. Today’s lawsuit seeks to force FDA to do what should be common sense—determine that food additives are safe before they can be added to our food.

Also posted in FDA, General interest, GRAS / Tagged | Comments are closed

The hidden – and potentially dangerous – chemicals in your diet

By Tom Neltner, Senior Director, Safer Chemicals Initiative / Published: April 6, 2017

Tom Neltner, J.D., is Chemicals Policy Director

While picking up groceries for the week, a shopper may compare brands, prices, and nutritional information to ensure they make economical and healthy choices for their family. Unfortunately, there’s much more to our food than meets the eye – or makes the label.

Approximately 10,000 food additives are allowed in our food. Food additives are substances used to flavor, color, preserve, package, process, and store our food. While some of the chemicals added to food or used in packaging are harmless, others are downright dangerous and linked to health concerns. Certain additives are linked to reproductive problems, developmental issues, and even cancer.

Perchlorate was approved in 2005 as a component of plastic packaging for dry food despite the fact that it is a known endocrine disruptor that impairs infant brain development. Benzophenone – an artificial flavor added to baked goods, dessert, beverages, and candy – is classified as a possible human carcinogen. The list goes on. No matter where you shop, your family’s health may be at risk.

Check out the cupboard below to see what else could be lurking in your food.

Illustration of a kitchen cabinet with labels showing the toxic chemicals in the bottles, boxes, and cans stored inside.

 

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Also posted in BPA, FDA, GRAS, Health policy, Markets and Retail, Regulation / Tagged , , , , , , , , , | Authors: / Comments are closed

EPA to consider perchlorate risks from degradation of hypochlorite bleach

By Tom Neltner, Senior Director, Safer Chemicals Initiative / Published: February 3, 2017

Tom Neltner, J.D., is Chemicals Policy Director and Maricel Maffini, Ph.D., Consultant

Virtually all types of food contain measurable amounts of perchlorate. Young children are the most highly exposed, and they consume levels that may be unsafe. Reducing exposure to perchlorate is of public health importance because it presents a risk to children’s brain development

One potentially significant source of the toxic chemical in food is hypochlorite bleach that, when not well managed, degrades to perchlorate. Bleach is used to sanitize food manufacturing equipment or to wash or peel fruits and vegetables. Thanks to a recent decision by Environmental Protection Agency’s (EPA) Office of Pesticide Programs, we will better understand the risk posed by perchlorate-contaminated bleach and whether standards are needed to improve the management of bleach.

Reduce perchlorate exposure by improving bleach management

In 2011, an excellent report by the American Water Works Association (AWWA) and the Water Research Foundation documented that hypochlorite bleach degrades into perchlorate. The report also included guidelines on better management of hypochlorite to preserve its effectiveness for drinking water utilities using it to disinfect water.

Most of AWWA’s recommendations are equally relevant to food manufacturers and anyone using bleach to disinfect food contact surfaces. The key recommendations are:

  • Dilute hypochlorite solutions on delivery. Cutting the concentration in half decreases the degradation rate by a factor of 7.
  • Store hypochlorite solutions at lower temperatures. Reducing temperature by 5oC decreases degradation rate by a factor of 2.
  • Keep pH between 11 and 13 even after dilution.
  • Avoid extended storage times, and use fresh hypochlorite solutions when possible.

The objective is not to reduce the use of bleach. Rather it is to preserve its effectiveness by preventing degradation to perchlorate through careful management.

Bleach: a food additive and a pesticide

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Also posted in Drinking water, Emerging science, FDA, Perchlorate, Regulation / Tagged , , , , , , | Authors: / Comments are closed

When it comes to lead, formula-fed infants get most from water and toddlers from food, but for highest exposed children the main source of lead is soil and dust

By Tom Neltner, Senior Director, Safer Chemicals Initiative / Published: February 3, 2017

Tom Neltner, J.D., is Chemicals Policy Director

On January 19, the Environmental Protection Agency (EPA) released a major new draft report proposing three different approaches to setting health-based benchmarks for lead in drinking water. We applauded EPA’s action and explored the implications for drinking water in a previous blog. One of the agency’s approaches provides useful, and surprising, insights into where the lead that undermines the health of our children comes from. Knowing the sources enables regulators and stakeholders to set science-based priorities to reduce exposures and the estimated $50 billion that lead costs society each year.

The EPA draft report is available for public comments until March 6, 2017, and it is undergoing external peer-review by experts in the field in support of the agency’s planned revisions to its Lead and Copper Rule (LCR) for drinking water. Following this public peer-review process, EPA expects to evaluate and determine what specific role or roles a health-based value may play in the revised LCR. With the understanding that some of the content may change, here are my takeaways from the draft:

  • For the 20% of most exposed infants and toddlers, dust/soil is the largest source of lead. Since we know that 21% of U.S. homes (24 out of 114 million) have lead-based paint hazards, this should not be surprising.
  • For most infants, lead in water and soil/dust have similar contributions to blood lead levels, with food as a smaller source. If the infant is formula-fed, water dominates.
  • For 2/3 of toddlers, food appears to provide the majority of their exposure to lead. This result was a surprise for me. EPA used data from the Food and Drug Administration’s (FDA) Total Diet Study collected from 2007 to 2013 coupled with food consumption data from the National Health and Nutrition Examination Survey collected from 2005 to 2011. In August 2016, FDA reported on levels of lead (and cadmium in food) commonly eaten by infants and toddlers based on a data set that is different from its Total Diet Study. FDA concluded that these levels, “on average, are relatively low and are not likely to cause a human health concern.”
  • For all children, air pollution appears to be a minor source of lead exposure. We think it is most likely because exposure is localized around small airports and industrial sources.

For a visual look at the data, we extracted two charts from the draft EPA report (page 81) that show the relative contribution of the four sources of lead for infants (0-6 month-olds) and toddlers (1 to <2 year-olds) considered by the agency. The charts represent national exposure distributions and not specific geographical areas or age of housing.

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