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Thyroid hormones and their relation to weight status
Thomas Reinehr1, Adelbert Isa, Gideon de Sousa
1Department of Pediatric Endocrinology, Vestische Hospital for Children and Adolescents, University of Witten/Herdecke, Datteln, Germany. T.Reinehr@kinderklinik-datteln.de
Hormone Research
|May 22, 2008
Summary
Thyroid hormone levels (TSH, fT3) in adolescents are linked to weight status, with obesity showing higher levels and anorexia nervosa (AN) showing lower levels, suggesting a reversible relationship potentially mediated by leptin.
Area of Science:
- Endocrinology
- Adolescent Health
- Metabolic Disorders
Background:
- Thyroid hormones play a crucial role in metabolic regulation.
- Obesity and anorexia nervosa (AN) are complex conditions impacting adolescent health.
- Alterations in thyroid function have been observed in eating disorders and obesity.
Purpose of the Study:
- To investigate thyroid hormone levels (TSH, fT3, fT4) in female adolescents with obesity and AN.
- To analyze changes in thyroid hormones before and after weight normalization.
- To explore the relationship between weight status, thyroid function, and hormones like leptin and insulin.
Main Methods:
- Measured TSH, fT3, and fT4 in 100 obese girls, 32 normal-weight girls, and 20 girls with AN (aged 14-18).
- Assessed hormone levels at baseline and after 1 year.
- Analyzed leptin, insulin, and HOMA in obese and normal-weight groups.
Main Results:
- Girls with AN had significantly lower TSH and fT3 than normal-weight girls.
- Obese girls exhibited significantly higher TSH and fT3 levels.
- Weight loss in obese females decreased TSH and fT3; weight gain in AN adolescents increased TSH and fT3.
- Leptin correlated with TSH and fT3, while insulin and HOMA did not show significant correlations.
Conclusions:
- Thyroid function (TSH, fT3) appears reversibly related to weight status in adolescents.
- Obesity is associated with increased TSH and fT3, while AN is linked to decreased levels.
- Leptin may act as a mediator connecting weight status and TSH regulation.
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