Diabetes Dialogue: Expanding GLP-1 Usage Into Type 1 Diabetes With Viral Shah, MD

Welcome back to Diabetes Dialogue: Technology, Therapeutics, & Real-World Perspectives!

In this episode of Diabetes Dialogue, recorded on-site at the American Association of Clinical Endocrinology (AACE) Annual Meeting 2026 in Las Vegas, Nevada, cohosts Diana Isaacs, PharmD, and Natalie Bellini, DNP, welcome Viral Shah, MD, professor of endocrinology at Indiana University, for a discussion centered on the evolving role of GLP-1 receptor agonists and broader diabetes classification in type 1 diabetes care. Shah challenges the traditional distinction between type 1 and type 2 diabetes, emphasizing that type 2 diabetes lacks a definitive diagnostic test and is instead a diagnosis of exclusion based on phenotypic characteristics. He explains that patients with type 1 diabetes can also exhibit features of type 2 diabetes, making these categories non–mutually exclusive and supporting the rationale for dual diagnoses when clinically appropriate.

The group explores how this framework informs the use of GLP-1 receptor agonists in type 1 diabetes, particularly for patients with obesity, cardiovascular disease, heart failure, or chronic kidney disease. Shah notes that while obesity provides a clear indication for GLP-1 therapy, he is also comfortable using these agents in patients with lower BMI when cardiovascular or renal protection is the primary goal, with careful attention to dose adjustment and avoidance of excessive weight loss or muscle mass reduction. He adds that SGLT2 inhibitors may be preferable in some leaner patients, particularly when renal indications predominate, and highlights recent clarification that SGLT2 inhibitor use for CKD in type 1 diabetes is not considered off-label when prescribed for kidney protection rather than glycemic control.

The conversation then shifts to Shah’s broader view that type 1 and type 2 diabetes differ more in pathophysiology than in long-term disease course. He argues that both conditions share progressive beta cell dysfunction and overlapping complication risks, suggesting the field should move away from rigid separation and toward a more unified understanding of diabetes progression.

This perspective leads into a discussion of “prediabetes,” a term Shah critiques as outdated and insufficient. He reviews its historical origins as a label for intermediate hyperglycemia and argues that it has unintentionally minimized urgency by framing the condition as merely a risk factor rather than part of the disease continuum. Citing evidence of significantly elevated cardiovascular, kidney, and mortality risk in people with prediabetes, he advocates for staging type 2 diabetes similarly to type 1 diabetes, rather than maintaining an artificial threshold between “no disease” and diabetes. He notes that while therapies such as metformin, semaglutide, and tirzepatide have demonstrated benefit in delaying progression, regulatory limitations persist because prediabetes is not formally recognized as a disease state.

The episode concludes with a discussion of autoantibody screening in adults labeled with prediabetes. Shah supports broader antibody testing, particularly in younger adults, to identify individuals with early-stage type 1 diabetes who may otherwise be misclassified and present later with DKA. He emphasizes that accessible antibody testing and therapies such as teplizumab make earlier identification increasingly meaningful, while also acknowledging the importance of patient preference and individualized decision-making. Across the discussion, Shah calls for greater flexibility in diabetes classification, earlier intervention across the disease spectrum, and a more proactive approach to preventing complications rather than waiting for traditional diagnostic thresholds to be crossed.

Editors’ Note: Isaacs reports disclosures with Dexcom, Abbott, Lilly, Novo Nordisk, Medtronic, Insulet, and others. Bellini reports disclosures with Abbott Diabetes Care, MannKind, Povention Bio, and others. Shah reports disclosures with Sanofi, Novo Nordisk, Lilly, Dexcom, Insulet, Tandem Diabetes Care, and others.

References

1. Shah V. Beyond Type 2: Evaluating GLP-1 Use in Type 1 Diabetes and Obesity. Presented at the American Association of Clinical Endocrinology Annual Meeting 2026 in Las Vegas, NV. April 22-24, 2026.