Managing nutrition with feline diabetes mellitus

At the 2026 Western Veterinary Conference (WVC), John Flanagan, PhD, framed his lecture, “Updates in Nutritional Management of Feline Diabetes Mellitus,” around 2 linked advances in feline diabetes mellitus care. These include a multidimensional classification system for feline diabetes and new clinical data supporting intentional caloric restriction in overweight diabetic cats. He explained that although feline diabetes affects a relatively small proportion of the population, its clinical consequences and the subsequent caregiver burden make refined, actionable management strategies a priority for all clinicians.¹

Background and classification framework

“Diabetic remission is something that we should be thinking about when we have a newly presented case of diabetes, or even a case that has been on treatment for quite some time,” Flanagan said, introducing the importance of treating feline diabetes as a dynamic condition rather than a static label.¹

His proposed classification captures 4 dimensions to support individualized decisions: diabetic status, body condition score, weight trajectory, and current medical therapy. From a nutritional perspective, the discussion reiterated several distinctions that matter in clinical practice. For instance, insoluble fiber has little impact on postprandial glycemic peaks, whereas digestible carbohydrates such as starch do, Flanagan explained. Additionally, wet food formulations allow for lower starch content than many dry diets, and higher dietary protein is generally desirable for glycemic support. These conceptual points provide the rationale for a single diet that permits safe caloric restriction while maintaining an improved nutrient-to-calorie ratio.¹

Study design and key results

Flanagan presented a dual-center, randomized clinical trial enrolling 72 overweight, insulin-treated cats. The study compared maintenance feeding with structured caloric restriction, with all cats consuming the same purpose-formulated diet. Research was conducted at the University of Copenhagen and the Royal Veterinary College. The intervention targeted approximately 2% weekly weight loss through individualized calorie allocation and weekly home weight checks. Because both groups used the same diet, energy intake was the only variable.²

After 12 weeks, 50% of cats in the caloric-restriction arm achieved diabetic remission compared with 30% in the maintenance arm. This was a statistically significant difference, and notably, remission clustered early with most cases occurring by 6 weeks. Flanagan summarized, “If we can put in place a weight reduction program for 12 weeks, which is not such a long period of time, we can potentially achieve a remission rate of 50% within 12 weeks.”^1-2

Secondary findings were equally relevant. Caloric restriction produced a mean weight loss of approximately 7% vs approximately 2.7% in controls. The protocol also preserved muscle condition, reduced insulin doses by approximately 36% in nonremitters, and decreased glycemic variability by approximately 45%. Safety signals were minimal, as no cases of diabetic ketoacidosis or hepatic lipidosis were reported. Adverse events were uncommon and largely limited to nonclinical hypoglycemia.²

Clinical takeaways

For cats that are overweight and treated with insulin but retain some residual β-cell function, intentional caloric restriction is a powerful tool, Flanagan said. Using a diet formulated for low-digestible carbohydrates and an increased nutrient-to-calorie ratio can safely increase the probability of inducing remission within a short 12-week window.^1-2

Flanagan said that even when remission is not achieved, improved glycemic control and reduced insulin requirements are likely. The new classification framework helps veterinary teams set individualized goals, such as choosing between remission and long-term control, while tracking weight trajectory and integrating medical and nutritional strategies. As Flanagan stressed, remission should be considered an early and shared therapeutic goal whenever it is clinically appropriate.^1-2

References

1. Flanagan J. Updates in nutritional management of feline diabetes mellitus. Presented at: 2026 Western Veterinary Conference; February 15-18, 2026; Las Vegas, NV.
2. Jørgensen FK, Mohanty A, Kieler IN, et al. Effect of 12-week intentional caloric restriction using Royal Canin Glycoadvanced on remission and glycemic control in overweight, insulin-treated cats: a dual-center randomized controlled trial. Manuscript accepted for publication. 2025.