The Claim
In older Chinese adults, higher selenium status, as measured by fingernail selenium concentration, is associated with a significantly increased risk of hyperthyroidism, with individuals in the second and third quartiles exhibiting over a fourfold higher odds of hyperthyroidism compared to those in the lowest quartile after adjustment for covariates.
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.
Older Chinese adults with higher selenium levels in their fingernails have a more than fourfold higher rate of hyperthyroidism compared to those with the lowest selenium levels, based on adjusted statistical analysis.
See the scientific wording
In older Chinese adults, higher selenium status measured by fingernail concentration is associated with a significantly increased risk of hyperthyroidism, with individuals in the second and third quartiles showing over a fourfold higher odds of hyperthyroidism compared to the lowest quartile after adjusting for covariates.
Higher selenium levels cause enzymes in the thyroid and body tissues to convert more thyroid hormone into its active form, which signals the brain to stop producing the hormone that tells the thyroid to make more, leading to excess active thyroid hormone in the blood.
What the research says
1 studyStudy: Selenium Status Associates with Thyroid Hormone and Thyroid Dysfunction in Older Chinese Adults
In older Chinese adults, those with medium to high selenium levels in their fingernails were more than four times as likely to have an overactive thyroid compared to those with the lowest levels, according to this study.
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.