Type 1 diabetes

Reduced Efficacy of Glucagon-Like Peptide-1 Receptor Agonists Therapy in People With Type 1 Diabetes and Genetic Forms of Obesity

J Diabetes Sci TechnolPublished Retrospective cohort study

An erratum to this article was published (J Diabetes Sci Technol, Mar 2026 ↗)

Authors' conclusion

The weight loss and glycemic lowering effects of GLP-1 RA therapy may be decreased in people with type 1 diabetes and obesity likely related to genetic causes. Further research is needed to understand GLP-1 RA mechanisms via energy regulating genes.

Study context

Population
Adults with T1D and obesity treated with GLP-1 RA therapy (including dual agonist tirzepatide)
Participants
11 vs 15
Exposure
GLP-1 RA therapy in obesity likely vs unlikely related to genetic mutation(s)
  • Genetic obesityn = 11
  • Non-genetic obesityn = 15reference
Outcome
Change in body weight and HbA1c with GLP-1 RA therapy
Follow-up
Six months

Main finding

As reported in the abstract

Weight change

Genetic obesity

−5.75

± 9.46 · kg

Non-genetic obesity

−8.65

± 9.36 · kg

P = 0.44

Observational data: associations, not effects.

Further findings

Met goal weight loss ≥5% or HbA1c decrease ≥0.4% · fewer with genetic obesity

P = 0.04

OutcomeGenetic obesityNon-genetic obesityP value
HbA1c change · six monthsNumerically lower reduction with genetic obesity−0.28 ± 0.96 %−0.43 ± 0.57 %P = 0.64

Original publication

Reduced Efficacy of Glucagon-Like Peptide-1 Receptor Agonists Therapy in People With Type 1 Diabetes and Genetic Forms of Obesity. J Diabetes Sci Technol. Published 17 April 2024. doi:10.1177/19322968241245680

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