Major Study of Teflon Chemical in People Suggests Harm To Immune System, Liver, Thyroid
WASHINGTON – A chemical used to make Teflon, food wrappers and dozens of other products may harm the immune system, liver and thyroid and cause higher cholesterol in children, according to the initial findings of a study of 69,000 people in West Virginia and Ohio who live near a DuPont manufacturing plant. The health effects observed in the study population are strong indicators of health problems that might be caused by PFOA in average Americans. Toxic effects from PFOA were observed in study participants with blood levels of the chemical equal to those found in the more highly exposed individuals in the US population. PFOA (also called C8) is one of a class of perfluorinated chemicals, or PFCs, used to make Teflon and other nonstick products, oil-resistant paper packaging and stain-resistant fabrics. A team from West Virginia University is leading the multi-year PFOA study, which is funded by a portion of a $107.5 million settlement paid by DuPont to settle a lawsuit over dumping PFOA in the region’s drinking water supplies. Last week, in the first public presentation of the C8 Health Project data, WVU scientists reported:
- In animal studies, PFOA exposure has previously been linked with death of immune cells and weakening of the body’s ability to protect itself from infection. The WVU study indicates higher levels of PFOA in people correlate with lower levels of a protein that helps the body fight bacteria, viruses, and other pathogens.
- Higher PFOA levels in West Virginia and Ohio residents are associated with higher levels of two enzymes that can indicate liver damage, and with lower levels of a liver protein that is an important part of the body’s defense against infection.
Elevated PFOA levels in children are associated with high cholesterol levels, predisposing children to future weight problems and accompanying risk of heart disease. In animal studies, early exposure to PFOA results in obesity later in life.
- Thyroid function was clearly affected in PFOA-exposed people, with the effect strongest at moderate levels of exposure, rather than the highest exposures.
Key Study Findings
Decreased ability to fight infection (immune & liver damage): Higher blood PFOA levels are associated with lower levels of a protein made by the liver that the body uses to fight infection. The changes may stem from PFOA-related liver damage.(All Study Participants)
Decreased ability to fight infection: Higher blood PFOA levels are associated with lower levels of immunoglobulin G, a protein made by bone marrow-derived white blood cells that the body uses to fight infection. (All study participants)
Liver damage: Higher blood PFOA levels are associated with higher levels of proteins that indicate liver damage. These proteins normally help the body metabolize amino acids, building blocks of proteins. Their presence in the blood at high levels can indicate that liver cells are damaged and are rupturing, leaking their contents into the bloodstream.(All study participants)
High cholesterol in children (obesity, heart disease): Higher blood PFOA levels are associated with higher levels of cholesterol in children, which can indicate a risk for obesity and heart disease later in life. (Children)
Thyroid damage: Higher blood PFOA levels are associated with changes in thyroid hormone levels. Thyroid hormone is critical for normal growth and development; the developing brain of a child is particularly vulnerable to damage from thyroid hormone changes. (All study participants)
EWG is a nonprofit research organization based in Washington, DC that uses the power of information to protect human health and the environment.