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Pet Nutrition Prebiotics in cat food Dr A C Beynen was professor of veterinary nutrition at the Faculty of Veterinary Medicine, Utrecht University, Th e Netherlands in the period of 1993-2007. Prebiotics can be defi ned as dietary carbohydrates that resist the cats’ digestive enzymes and pass to the hindgut where they fall prey to bacteria. In other words, prebiotics are indigestible, fermentable carbohydrates. Most plant ingredients in cat foods carry with them variable types and amounts of prebiotics. Wet food may contain thickening agents with prebiotic properties, such as guar gum and carrageenan. The focus here is on high-purity prebiotics that are added to cat foods to support a claim for gut health. Cat foods promising gut health mostly contain added FOS (fructo-oligosaccharides), beet pulp, MOS (mannanoligosaccharides), XOS (xylo-oligosacharides) or lactosucrose as highlighted ingredient. Those foods generally purport to stimulate growth of the good gut bacteria toward a healthier community and to aid in the cat’s digestion. Uncurbed intakes of prebiotics, meanwhile, expand fecal bulk, due to more water and solids, while appearing as loose stool. The research literature provides limited information on the effects of prebiotics in cats, but some tentative comments can be made. High intakes of FOS, beet pulp or guar gum depress the net digestive effi ciency for dietary dry substances, whereas MOS acts augmentative. Digestive measures appear unreported for XOS, lactosucrose and carrageenan. Dietary FOS and lactosucrose, rather than XOS, may enhance putative good bacteria in the large intestine. 28 Whether or not cat food featuring a certain prebiotic lives up to its promise of boosting gut health, depends on the backing evidence. Claim substantiation should be based on controlled research in cats fed the same amount and type of the prebiotic in the marketed food. That information seems unavailable in the public domain. Cat lovers may contact the appropriate food-brand proprietor for proof of effi cacy. Creature Companion | August 2019 • Vol. XII • Issue 8 • Noida