Differential Responses to Dietary Protein and Carbohydrate Ratio on Gut Microbiome in Obese vs. Lean CatsOriginal paper
Karen Pendergrass is a microbiome researcher specializing in microbiome-targeted interventions (MBTIs). She systematically analyzes scientific literature to identify microbial patterns, develop hypotheses, and validate interventions. As the founder of the Microbiome Signatures Database, she bridges microbiome research with clinical practice. In 2012, based on her own investigative research, she became the first documented case of FMT for Celiac Disease, four years before the first published case study.
Read MoreWhat was studied?
This study examined how a high-protein low-carbohydrate (HPLC) diet, compared with a standard control diet, affects the gut microbiome of domestic cats. Researchers used 16S rRNA gene profiling to track microbial composition across two feeding phases. The design compared responses between overweight and lean cats to see whether body condition changes how diet shapes gut microbiota.
Who was studied?
The study enrolled thirty-nine lean and overweight domestic short-haired cats, with a median age of 7.2 years. Lean cats had a median body fat of 15.8%, while overweight cats had a median body fat of 32.5%. All cats first ate a control diet for 8 weeks, after which half continued on the control diet and half switched to the HPLC diet for another 8 weeks.
What were the most important findings?
Dietary protein and carbohydrate ratio significantly impacted the gut microbiome, and this effect was more pronounced in overweight cats than in lean cats. No microbial taxon differed between diet groups among lean cats. In overweight cats, however, compositional changes occurred at multiple taxonomic ranks, including a phylum-level increase in Fusobacteria in cats fed the HPLC diet compared to those fed the control diet.
What are the greatest implications of this study?
The findings suggest that body weight status influences how strongly diet reshapes the feline gut microbiome, with obese cats showing greater microbial sensitivity to macronutrient shifts than lean cats. This implies that high-protein low-carbohydrate diets recommended for weight management may have body-condition-dependent effects on gut microbiota. Further research is needed to determine whether these microbial shifts, such as the rise in Fusobacteria, carry functional or health consequences for obese cats undergoing dietary weight management.