A new meta-analysis published in Frontiers in Endocrinology has found that low iodine levels are associated with a significantly higher risk of developing thyroid nodules, according to researchers. The analysis pooled data from 25 studies involving 54,621 participants, documenting 13,569 thyroid nodule events. Individuals with low iodine levels had a 31.5% higher likelihood of developing thyroid nodules compared to those with adequate levels, the report stated. Excessive iodine intake above 300 micrograms per liter independently raised the risk of subclinical hypothyroidism, according to the study.
Study Details and Findings
Researchers combined data from 25 studies with 54,621 participants, recording 13,569 thyroid nodule events, the report stated. The analysis found that people with low iodine levels had a 31.5% increased risk of developing thyroid nodules relative to those with sufficient iodine. The relationship was found to be bidirectional: both deficiency and excess iodine intake above 300 mcg/L were linked to distinct thyroid problems, including subclinical hypothyroidism, researchers said. [2] notes that most thyroid nodules are benign, but the underlying nutritional driver is often overlooked. Iodine deficiency is known to cause the thyroid gland to enlarge as it attempts to compensate, a process that promotes nodule formation.
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