Obesity

Oxytocin-induced changes in free T3/free T4 ratio and relationship with quality of life in adults with obesity

J Clin Endocrinol MetabPublished Secondary analysis of a randomised clinical trial

Authors' conclusion

Prolonged OXT vs placebo increased fT3/fT4 and impacted the relationship between fT3/fT4 and MHQoL changes, with a trend-level positive correlation between fT3/fT4 and MHQoL change scores.

Study context

Population
Adults with obesity, tertiary academic center
Participants
61 adults
Comparison
Intranasal oxytocin (OXT) vs placebo
Primary endpoint
Pre- and posttreatment fasting thyroid hormones (fT3/fT4 ratio) and relationship with MHQoL changes
Follow-up
Week 6 (thyroid hormones); week 8 (MHQoL)
Methodological details8-week, tertiary academic center
  • 8-week
  • Tertiary academic center

Primary result

As reported in the abstract

fT3/fT4 ratio change · 6 weeks
Increase in fT3/free T4 (fT4) in OXT
P = .048
No change in fT3/fT4 in placebo
P = .406

Further findings

Relationship between fT3/fT4 change (6 weeks) and MHQoL change (8 weeks) — Increased fT3/fT4 positively associated with MHQoL improvement
trend-level P = .088 · treatment × Δ[fT3/fT4] P = .023

TSH, fT4 and fT3 · 6 weeks

TSH, fT4 and fT3 did not change
P ≥ 0.154

Original publication

Oxytocin-induced changes in free T3/free T4 ratio and relationship with quality of life in adults with obesity. J Clin Endocrinol Metab. Published 9 September 2026. doi:10.1210/clinem/dgag291

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