Cats have a notably limited relationship with sugar. They lack functional sweet taste receptors (the Tas1r2 gene is a pseudogene in cats), meaning they literally cannot taste sweetness. This makes evolutionary sense for an obligate carnivore whose natural diet contains almost no sugar. While cats can metabolize small amounts of simple sugars, they process glucose more slowly than omnivores and are prone to prolonged blood sugar elevation after sugar-rich meals.
Your cat needs zero added sugar in their diet. Natural sugars in small fruit treats (a blueberry or two) are harmless in tiny quantities, but sugar should never be a deliberate part of your cat's nutrition plan. Cats derive their blood sugar from protein metabolism, not dietary sugars.
Sugar is not a required nutrient for cats. There are no deficiency signs because cats derive their blood glucose primarily from protein through gluconeogenesis.
Excessive sugar intake can contribute to obesity, dental disease, and may worsen or trigger diabetes mellitus in predisposed cats. Avoid sugary human foods, sweetened yogurts, and treats containing added sugars.
