Updates in nutritional management of feline diabetes mellitus

Study design and key results

Flanagan presented a dual-center, randomized clinical trial enrolling 72 overweight, insulin-treated cats. The study compared maintenance feeding to structured caloric restriction while all cats consumed 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% versus roughly 2.7% in controls. The protocol also preserved muscle condition, reduced insulin doses by about 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 insulin-treated but retain some residual β-cell function, intentional caloric restriction is a powerful tool, Flanagan said. Using a diet formulated for low digestible carbohydrate 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 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 or 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: Western Veterinary Conference. February 17, 2026; Las Vegas, Nevada.
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.