YOOtheme
close

Calendar

Events
Toxins in household dust may be harmful to kids
Most of the dust that coats your furniture and floors comes from outdoors and can pose a health threat, a new study suggests.
BPA in canned foods could harm children, group says
Measurable levels of the chemical additive bisphenol A (BPA) were found in a variety of canned goods, including some that claimed to be BPA-free, according to an analysis released this week by the nonprofit advocacy group Consumers Union.
Toxic toys? Health group finds high lead levels
Children's toys carrying the Barbie and Disney logos have turned up with high levels of lead in them, according to a California-based advocacy group — a finding that may give consumers pause as they shop for the holiday season.
Cigarette smoking during pregnancy
Cigarette smoking during pregnancy

Cigarette smoking during pregnancy is associated with potentially harmful changes in both maternal and fetal thyroid function,

"We studied the influence of cigarette smoking on thyroid function of two groups of women at different stages of pregnancy - one in the first trimester and the other in the third trimester," said Dr. Bijay Vaidya, Ph.D., of Peninsula Medical School at Royal Devon and Exeter Hospital in the United Kingdom, and coauthor of the study. "In both groups we found that smoking during pregnancy is associated with changes in the mothers' thyroid hormone levels."

Optimal maternal thyroid function during pregnancy is vital for a successful pregnancy outcome, said Dr. Vaidya. The adverse outcomes associated with thyroid dysfunction during pregnancy include increased risk of miscarriage, premature birth, low birth weight and impaired neuropsychological development of the baby.

Dr. Vaidya and his colleagues also measured thyroid hormone levels in the umbilical cord of babies born to smoking mothers and found that smoking-related changes in thyroid function extend to the fetus. Dr. Vaidya believes that impaired thyroid function in the fetus could have potentially harmful biological consequences.

The study also found that in mothers who stopped smoking during pregnancy their thyroid hormone levels were comparable to levels found in non-smokers, which suggests that changes in thyroid function are rapidly reversible.

There is currently no definitive explanation for how smoking affects thyroid function, but Dr. Vaidya suggests that smoking may influence thyroid hormone levels by affecting the enzyme which converts the active form of thyroid hormone to an inactive form.