The Study
Expression of thyrotropin and thyroid hormone receptors in adipose tissue of patients with morbid obesity and/or type 2 diabetes: effects of weight loss
This study found that people who are very overweight have different genes working in their fat than people who aren't overweight, and those genes change after they lose a lot of weight. But it doesn't prove that the fat itself is causing the hormone changes—it just shows they happen together.
Analysis score
Maximum 44 for a cross-sectional study.
Where the score came from
When you're very overweight, your fat cells stop listening to thyroid hormones as well. When you lose weight, they start listening again — and your thyroid hormone levels change too.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 544 / 100
Quality score
Snapshots of a population at a single point in time, or descriptions of small groups. Can identify correlations and prevalence, but cannot determine cause and effect.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Yes — this suggests fat isn't just passive storage; it actively talks to your thyroid, and losing weight helps restore that conversation.
- 2Obese people had 67% less TSH receptor and 33% less thyroid hormone receptor in fat than lean people.
- 3After losing weight, those receptors went up by 150% and 70%, while thyroid hormone levels in blood dropped by 170% (TSH) and 36% (FT3).
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
International Journal of Obesity
Year
2009
Authors
M. Nannipieri, F. Cecchetti, M. Anselmino, S. Camastra, P. Niccolini, M. Lamacchia, M. Rossi, G. Iervasi, E. Ferrannini
Related Content
Claims (5)
In obese individuals, thyroid hormone receptor levels in fat tissue are lower regardless of whether they have normal or impaired glucose tolerance, showing that obesity itself directly causes this reduction.
In obese adults with a BMI of 46, levels of two thyroid-related receptors in fat tissue are 67% and 33% lower than in lean people, and after 12 months of weight loss from gastric bypass surgery, these receptor levels increase by 150% and 70%.
In obese individuals, the levels of two thyroid-related receptors in belly fat decrease, and these levels rise again after weight loss, just as they do in under-the-skin fat. This shows that thyroid hormone signaling changes in fat tissue are not unique to one type of fat.
After gastric bypass surgery and subsequent weight loss, levels of thyroid-related receptors in fat tissue rise significantly, while levels of thyroid hormones in the blood decrease, reflecting a coordinated shift in thyroid signaling between fat tissue and the bloodstream.
People with severe obesity have 170% higher thyroid-stimulating hormone and 36% higher free triiodothyronine in their blood compared to people with normal weight, regardless of whether they have thyroid disease.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.