The Claim
In pregnant women in the second and third trimesters with borderline iodine deficiency, 40% have negative body iron stores and 16% have total thyroxine (TT4) levels below 100 nmol/L.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
Among pregnant women with borderline iodine deficiency during the second and third trimesters, 40% have low iron stores and 16% have total thyroxine levels below 100 nmol/L.
See the scientific wording
In a population with borderline iodine deficiency, nearly 40% of pregnant women in the second and third trimesters have negative body iron stores, and 16% have total thyroxine (TT4) levels below 100 nmol/L, indicating a high prevalence of concurrent iron and thyroid dysfunction.
When the body lacks sufficient iron, the thyroid gland cannot make enough thyroid hormone because the enzyme that uses iodine to build the hormone needs iron to work. This causes thyroid hormone levels to drop, and the brain responds by signaling the thyroid to work harder, which raises another hormone called TSH.
What the research says
1 studyStudy: Iron deficiency predicts poor maternal thyroid status during pregnancy.
When pregnant women don’t have enough iron, their thyroid doesn’t work as well, and this study shows that almost 4 in 10 women with low iron also had low thyroid hormone levels — meaning the two problems often happen together.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.