Higher TSH Levels Linked to NAFLD in Obese Youth: Study

A recent study published in the journal of Endocrine Practice found that children and adolescents with obesity and Nonalcoholic Fatty Liver Disease (NAFLD) have elevated thyroid-stimulating hormone (TSH) levels when compared to peers without NAFLD, while levels of free thyroxine (T4) and free triiodothyronine (T3) remain similar

The study pooled data from 10 observational studies which involved over 5,100 participants, provided one of the most comprehensive looks on how thyroid function intersects with liver health in pediatric obesity. This apparent mismatch, where TSH is elevated but thyroid hormones are not, supports a growing concept known as obesity-related hyperthyrotropinaemia. Rather than indicating true thyroid disease, this condition may reflect a metabolic adaptation or marker linked to excess weight and its complications.

The findings are particularly relevant given the rising prevalence of NAFLD among children with obesity. Often described as the hepatic manifestation of metabolic syndrome, NAFLD can progress silently and, in severe cases, lead to long-term liver damage. Identifying early biomarkers associated with its development is therefore a key priority.

This systematic review of major medical databases selected studies that compared thyroid function in obese youth with and without NAFLD. Using random-effects meta-analysis, they found a mean TSH difference of 0.37 mIU/L between groups, a modest elevation that remained consistent across sensitivity analyses. Also, there were no significant differences in circulating thyroid hormones, which reinforces the idea that the thyroid gland itself is not failing.

The elevated TSH may be linked to broader metabolic disruptions. Some speculate that low-grade inflammation, insulin resistance, or hormonal signaling between the liver and endocrine system could be influencing TSH regulation.

The study emphasized that these data should not prompt routine thyroid treatment in affected children. Since thyroid hormone levels are normal, interventions that target the thyroid axis are unlikely to be beneficial. Instead, TSH may serve as a useful clinical signal which points to underlying metabolic stress, including liver fat accumulation.

Further prospective studies to determine whether elevated TSH contributes to NAFLD development are required. Understanding this relationship could open new doors for early detection and risk stratification in pediatric obesity.

Source:

Gatta, E., Ugoccioni, M., Gandossi, E., Delbarba, A., Agosti, B., Pirola, I., Rotondi, M., & Cappelli, C. (2026). Thyroid function and non-alcoholic fatty liver disease in children and adolescent with obesity: a systematic review and meta-analysis. Endocrine Practice: Official Journal of the American College of Endocrinology and the American Association of Clinical Endocrinologists. https://doi.org/10.1016/j.eprac.2026.04.002