Fast food burgers, fries, and pizza may leave you full of phthalates
Huanjia Zhang for the Environmental Health News
This
is the first study to directly measure the amount of phthalates present in
common fast foods in the U.S. and adds to mounting evidence linking
phthalate exposure to fast food consumption.
A group of synthetic chemicals widely used to make plastic more flexible, phthalates are as ubiquitous in modern life as their host plastic products, ranging from toys to personal care products to food packages.
Easily absorbed by human bodies, phthalates have been shown in human and animal studies to disrupt our endocrine system by heisting hormone receptors—such as the estrogen receptors or the retinoic acid X receptors—and turning on and off the switches for gene expressions.
The chemicals have been linked to a wide range of health
impacts, including birth and reproduction problems, impaired brain development,
diabetes, and cancer.
"Phthalates are everywhere," Lariah Edwards, a postdoctoral scientist at George Washington University's Milken Institute School of Public Health and the lead author of the paper, told EHN. "There's enough evidence for us to be concerned."
The researchers collected 64 fast food items—including hamburgers, fries, chicken nuggets, chicken burritos, cheese pizza—from six popular fast food chains (McDonald's, Burger King, Pizza Hut, Domino's Pizza, Taco Bell, and Chipotle) in San Antonio, Texas as well as three pairs of gloves used to handle these foods from three of the restaurants and tested them for eight common phthalates (DEHP, DnBP, BBzP, DMP, DiBP, DnOP, DiNP, and DEP).
Additionally, they looked
at levels of three replacement plasticizers, chemicals used to substitute
banned phthalates, in the foods and gloves collected.
Among
the 67 food and glove samples analyzed in this study, all eight phthalates except
DMP were detected. Specifically, 52 (81%) of the samples contained a phthalate
called DnBP while 45 (70%) contained DEHP. Mounting scientific evidence
has linked both
chemicals to fertility and reproductive problems in humans as well as increased
risks for learning, attention, and behavioral disorders in childhood.
Additionally,
the new study found that, in general, foods containing meats, such as cheeseburgers
and chicken burritos, had higher levels of chemicals compared to those that
don't.
Jessie Buckley, an
environmental epidemiologist at Johns Hopkins University who was not involved
in this study, told EHN the findings speak to fast foods as "a double
whammy": offering lower nutrition values and pernicious chemicals.
Regrettable
substitution chemicals
In
addition to traditional phthalates, the authors of the study also investigated
the amount of three common replacement plasticizers, cousin chemicals
synthesized to replace some of the banned phthalates, in the food and glove
samples. The results showed that all three replacement plasticizers—DEHT,
DINCH, and DEHA—were present.
"I
was really excited to see that this study included those," said Buckley
who, among many other scientists, is working to investigate the health impacts
of these novel plasticizers which scientists still know little about.
Currently in the U.S., "a chemical isn't a problem until it's proven dangerous," Douglas Ruden, an environmental toxicologist who studies phthalates at Wayne State University but was not involved in this study, told EHN.
Therefore, although the U.S. Consumer
Product Safety Commission banned the use of
eight phthalates in children's toys and child-care products in 2017, the
plastic industry is able to replace the prohibited phthalates with slightly
tweaked plasticizer chemicals.
"It
is like whack-a-mole," said Ruden, referring to the tug-a-war between
scientists trying to assess the health and safety of potentially harmful new
plasticizers and their evolving successors.
Moreover,
the phthalates banned by the Consumer Product Safety Commission are not
outlawed by the U.S. Food and Drug Administration in food packaging materials. As
a result, some of the prohibited phthalates, such as DiBP and DiNP, still could
be found in food products—such as the ones collected in this study, potentially
making their way back to children.
The
discrepancy in phthalate regulations "just doesn't make any
sense," Stephanie Engel, an environmental and
perinatal epidemiologist at the University of North Carolina who was not
involved in this study, told EHN. "I think it is critical that the U.S.
regulatory agencies focus on common sense regulations that remove phthalates
from consumer products."
Engel's research found that mothers' exposure to phthalates is associated with increased risk of ADHD and ADHD-like behaviors and other behavioral issues in children down the road.
Nutritional
disparities
One
limitation of this study is that the researchers collected a relatively small
number of fast food items in one city. Nonetheless, both Engel and Ruden think
the paper offered an important first step to shed light on the extent to which
phthalates exist in fast food.
This study also illuminates the health and nutritional disparities among under-resourced communities, which are more likely to consume fast foods and thus more susceptible to phthalate exposure.
Between 2013 and 2016, more than one-third of U.S adults consumed fast food on any given day, with non-Hispanic Black adults consuming the most (42.4%), according to the U.S. Centers for Disease Control and Prevention (CDC).
Children and adolescents are in a similar boat: CDC data showed that between 2015 and 2018, 36.3%
of them consumed fast food on a given day, with non-Hispanic Black and Hispanic
adolescents consuming the most.
"That's
something to think about," said Edwards, the study
author. "I hope that my science can inform those whose job is to look at
policy and figure out ways to strengthen and better protect public
health."
