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Flame retardants could contribute to hyperthyroidism in older cats

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Posted April 27, 2015
Image credit: Pam Frost Gorder, Ohio State University

Image credit: Pam Frost Gorder, Ohio State University

For years, health advocates have been pushing to ban some flame retardants for their potentially harmful effects, especially on young children and infants. Now scientists report these compounds could play a role in a common health problem for one of our most beloved pets: cats. In the ACS journal Environmental Science & Technology, a new study found that cats with hyperthyroidism had high levels of certain flame retardants, hinting at a possible link.

Jessica Norrgran and colleagues explain that more than 10 percent of older cats develop hyperthyroidism, a hormonal disorder that can cause weight loss, hyperactivity, aggression, vomiting and other symptoms. In humans, the condition has been linked to Graves’ disease and iodine deficiency. No one knows for sure what causes hyperthyroidism in cats. Some studies have suggested a connection between the feline condition and flame retardants. These substances leach from plastics and furniture, and accumulate in dust that can end up on cats’ fur. The animals’ meticulous grooming methods make them particularly susceptible to exposure to these compounds. Norrgran’s team wanted to investigate this potential link further.

The researchers tested blood samples from pet felines in Sweden – 37 hyperthyroid cats and 23 cats with normal thyroid function. They found that those with hyperthyroidism had elevated levels of flame retardants known as polybrominated diphenyl ethers (PBDEs). Although the results don’t prove that the compounds cause the disorder, the study suggests they could be linked.

Source: ACS

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