Diabetes, Insulin Resistance, and Metabolic Syndrome in Horses
Authors: Philip Johnson, C. Wiedmeyer, A. Lacarrubba, V. Ganjam, N. Messer
Journal: Journal of Diabetes Science and Technology
Summary
# Editorial Summary Obesity in horses has become increasingly prevalent, driven by management practices involving prolonged inactivity and diets excessive in sugar and starch—mirroring trends in human medicine. This 2012 review examined the relationships between insulin resistance, glucose intolerance, and equine metabolic syndrome (EMS), synthesising the growing body of evidence on its epidemiology and pathophysiology. The critical distinction from human metabolic syndrome lies not in the underlying metabolic dysfunction, but in its clinical consequences: whilst humans face elevated cardiovascular and type 2 diabetes risk, horses with EMS face a far more immediate and devastating threat of laminitis, which can progress to a severity requiring euthanasia. The authors underscore that unlike our own species, overt type 2 diabetes mellitus remains uncommon in equines despite widespread insulin resistance and metabolic dysfunction. For practitioners involved in nutrition, veterinary management, and rehabilitation, this review emphasises that metabolic assessment and dietary intervention in overweight, insulin-resistant horses are not merely aesthetic or performance concerns but critical preventative measures against a career-ending—or life-ending—lameness condition.
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Practical Takeaways
- •Review feeding practices and exercise regimens for overweight horses, particularly those showing signs of insulin resistance, as these are modifiable risk factors for laminitis
- •Screen obese or insulin-resistant horses for EMS and monitor closely for laminitis development, which may require euthanasia in severe cases
- •Focus management on reducing sugar and starch intake while increasing physical activity to mitigate metabolic syndrome risk
Key Findings
- •Equine metabolic syndrome (EMS) is characterized by insulin resistance and obesity, analogous to human metabolic syndrome but with greater risk for laminitis development
- •Contemporary horse management practices involving physical inactivity and high sugar/starch diets are associated with increased obesity and insulin resistance
- •Unlike humans, horses with metabolic syndrome have lower risk of developing type 2 diabetes mellitus and associated chronic conditions