Washington: A new study has claimed that pregnant women, who are unable to make nearly enough thyroid, are nearly 4 times more likely to produce a autistic child.The link emerged from a study of more than 4,000 Dutch mothers and their children, and it supports a growing view that autism spectrum disorders can be caused by a lack of maternal thyroid hormone, which past studies have shown is crucial to the migration of foetal brain cells during embryo development.Lead author Gustavo Roman, M.D., a neurologist and neuroepidemiologist who directs the Nantz National Alzheimer Center, said that it`s increasingly apparent to us that autism is caused by environmental factors in most cases, not by genetics.The researchers also found that autistic children had more pronounced symptoms if their mothers were severely deficient for T4, also called thyroxine.Mild T4 deficiencies in mothers produced an insignificant increase in autistic children`s symptoms.The most common cause of thyroid hormone deficiency is a lack of dietary iodine - because both the thyroid hormones, T3 and T4, contain that element.
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