Health Effects of PFAS Exposure
PFAS (per- and polyfluoroalkyl substances), including PFOS and PFOA, are often referred to as "forever chemicals" because they persist in the environment and in the human body. They are linked to a range of adverse health effects, even at low levels of exposure, based on studies in humans and animals.Well-Established Health Effects
1. Immune System Suppression
o Reduced vaccine response in children.o General weakening of the immune response.
2. Increased Cholesterol Levels
o Consistently observed across multiple populations.o Especially linked with PFOS and PFOA exposure.
3. Liver Damage
o Elevated liver enzymes (ALT).o Fatty liver disease in animal studies.
4. Kidney and Testicular Cancer
o Strong associations in highly exposed populations (e.g., DuPont workers).o Included in some legal settlements as known health outcomes.
5. Thyroid Disease
o Particularly hypothyroidism.o More common in women and children with high PFAS exposure.
Likely or Suspected Health Effects 6. Pregnancy Complications o Increased risk of preeclampsia and reduced birth weight.o Potential developmental delays in infants. 7. Hormonal Disruption o Affects estrogen and androgen regulation.o May delay puberty or impair fertility. 8. Increased Risk of Certain Cancers o Beyond testicular and kidney, studies suggest links to breast, prostate, and pancreatic cancer, though evidence is still developing. 9. Obesity and Metabolic Disorders o Disruption of lipid and glucose metabolism.o May contribute to insulin resistance and type 2 diabetes. Mechanism of Harm • Bioaccumulation: PFAS compounds accumulate in blood, liver, kidneys, and breast milk.• Persistence: Once in the body, they can remain for years or decades.• Molecular Disruption: PFAS bind to proteins, interfere with cell signaling, and alter hormone function.
Vulnerable Populations • Infants and children (due to developmental sensitivity)• Pregnant women• People with high occupational or environmental exposure (e.g., firefighters, defense personnel, those living near contaminated sites)
Exposure Sources • Contaminated drinking water• Firefighting foams (AFFF)• Non-stick cookware, stain-resistant fabrics, food packaging• Industrial discharge near PFAS-using facilities
Likely or Suspected Health Effects 6. Pregnancy Complications o Increased risk of preeclampsia and reduced birth weight.o Potential developmental delays in infants. 7. Hormonal Disruption o Affects estrogen and androgen regulation.o May delay puberty or impair fertility. 8. Increased Risk of Certain Cancers o Beyond testicular and kidney, studies suggest links to breast, prostate, and pancreatic cancer, though evidence is still developing. 9. Obesity and Metabolic Disorders o Disruption of lipid and glucose metabolism.o May contribute to insulin resistance and type 2 diabetes. Mechanism of Harm • Bioaccumulation: PFAS compounds accumulate in blood, liver, kidneys, and breast milk.• Persistence: Once in the body, they can remain for years or decades.• Molecular Disruption: PFAS bind to proteins, interfere with cell signaling, and alter hormone function.
Vulnerable Populations • Infants and children (due to developmental sensitivity)• Pregnant women• People with high occupational or environmental exposure (e.g., firefighters, defense personnel, those living near contaminated sites)
Exposure Sources • Contaminated drinking water• Firefighting foams (AFFF)• Non-stick cookware, stain-resistant fabrics, food packaging• Industrial discharge near PFAS-using facilities