Why your thyroid slows down after weight-loss surgery
Influences of obesity and weight loss on thyroid hormones. A 3–3.5-year follow-up study on obese subjects with surgical bilio-pancreatic by-pass
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
After a special weight-loss surgery, your body absorbs less fat, and this makes your active thyroid hormone drop—even after you stop losing weight.
Systematic Reviews & Meta-Analyses
Max 100Randomized Controlled Trials
Max 90Cohort Studies
Max 72Case-Control Studies
Max 58Cross-Sectional Studies
Max 44Case Reports & Case Series
Max 30Expert Opinion & Narrative Reviews
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Evidence Score
Groups of people are followed over time to see who develops an outcome. Strong for identifying risk factors and associations, but cannot prove causation as firmly as RCTs.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
After a special weight-loss surgery, your body absorbs less fat, and this makes your active thyroid hormone drop—even after you stop losing weight.
Systematic Reviews & Meta-Analyses
Max 100Randomized Controlled Trials
Max 90Cohort Studies
Max 72Case-Control Studies
Max 58Cross-Sectional Studies
Max 44Case Reports & Case Series
Max 30Expert Opinion & Narrative Reviews
Max 531 / 72
Evidence Score
Groups of people are followed over time to see who develops an outcome. Strong for identifying risk factors and associations, but cannot prove causation as firmly as RCTs.
Publication
Authors
Buscemi S, Verga S, Maneri R, Blunda G, Galluzzo A
Related Content
Claims (7)
In morbidly obese adults who undergo bilio-pancreatic bypass surgery, thyroid-stimulating hormone levels do not change even when free triiodothyronine levels and body weight change significantly, and these stable TSH levels are linked to the rate at which the body breaks down protein during fasting.
After bilio-pancreatic bypass surgery in severely obese adults, levels of the active thyroid hormone FT3 drop by 10.5% within three months and stay 11.2% lower for up to three and a half years, even when body weight stops changing.
In adults with severe obesity, lower levels of the active thyroid hormone FT3 are consistently observed alongside higher body mass index values.
After bilio-pancreatic bypass surgery, reduced fat absorption is linked to persistently lower levels of free triiodothyronine in obese adults, even when weight no longer changes, suggesting that nutrient absorption directly affects thyroid hormone levels independently of weight loss.
After bariatric surgery, morbidly obese adults maintain normal levels of free thyroxine and thyroid-stimulating hormone over three to three and a half years, even though their free triiodothyronine and triiodothyronine levels drop significantly.