A veterinary study published in Frontiers in Animal Science revealed that domestic cats fed plant-based diets were 34 percent less likely to be overweight compared to those on meat diets, suggesting potential metabolic benefits despite requiring broader research to verify statistical significance across larger companion animal populations.
The online investigation evaluated caregiver-reported veterinary assessments across 1,305 domestic felines maintained on their respective feeding regimens for a minimum of one year. Within the sample, 90 percent consumed conventional meat-based diets while 10 percent received plant-based options. Researchers adjusted the dataset for variables including age, sex, neuter status, physical activity levels, and feeding routines. Although the vegan cohort demonstrated a 34 percent reduction in the likelihood of being classified as overweight, the finding did not achieve formal statistical significance due to the smaller sample size of vegan cats, even though weight-related illnesses were entirely absent in that specific subset.
Weight management remains a critical issue in companion animal care, with clinical estimates indicating that 30 to 60 percent of cats suffer from excess weight or obesity. These conditions are heavily tied to secondary complications such as osteoarthritis, feline diabetes, and urinary tract disorders. Lead researcher Andrew Knight, an Adjunct Professor at the Murdoch University School of Veterinary Medicine in Perth, Australia, emphasized the notable trends emerging from the data.
“People who fed their cats vegan diets also reported lower rates of weight-related conditions, such as osteoarthritis and other musculoskeletal and mobility issues. However, the relatively low number of vegan-fed cats means these findings cannot be considered definitive.”
“Interestingly, most cats fed vegan diets were predominantly consuming dry kibble and were more likely to have food available throughout the day. These are feeding practices typically associated with an increased risk of becoming overweight. Despite this, we observed lower rates of overweight cats in this group.”
Nutritional Formulation and Research Directions
The paper highlighted that dietary composition represents only one component of weight management alongside environmental and physiological factors. While direct laboratory analysis of the foods was not conducted, differences in commercial formulations could explain the observed variance. Many commercial plant-based formulations feature higher dietary fiber and reduced fat and caloric density compared to traditional meat-based products, aiding metabolic satiety.
The study also highlighted potential shifts in levels of L-carnitine, an amino acid derivative that assists cellular energy metabolism by transporting fatty acids into cells for fuel. Professor Knight, who also holds affiliations with Griffith University in Brisbane, the University of Winchester, and the Sustainable Pet Food Foundation in London, noted the importance of methodical follow-up trials.
“We cannot conclude from this study that vegan diets definitively protect cats against becoming overweight, but we have identified a consistent pattern that warrants further investigation. The ideal next step would be a larger prospective study that directly measures what cats eat, their caloric intake, and their body condition.”
“Cat owners must always ensure that their pets are fed nutritionally complete diets and select commercial vegan foods containing appropriate supplements to deliver all essential nutrients.”
Research link: https://www.frontiersin.org/journals/animal-science/articles/10.3389/fanim.2026.1939965/full
