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Jul 31, 2026

Canadian study links prenatal fluoride exposure from tea to lower childhood IQ scores

A study of 485 mother-child pairs in Canada found that each 0.5 mg/day increase in estimated fluoride intake from tea during pregnancy was associated with a 2.24-point lower full-scale IQ score in children aged 3-4 years, though researchers note the observational design has limitations.

Jul 31, 2026·1 source
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Top claims

  • ▪The study findings underscore the need to monitor fluoride levels in tea and increase transparency through clearer product labeling.
  • ▪The study assessed maternal beverage consumption using questionnaires and measured maternal urinary fluoride levels from spot urine samples collected during pregnancy.
  • ▪Tea plants act as bioaccumulators, leading to relatively high fluoride concentrations in some teas, particularly brick and black teas.

Subtopics

Nutrition & diet hacking1Public health research1

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