Research overview: feline sweet blindness and obligate carnivory

Cats famously fail to respond to sweet tastes, and this trait is rooted in their genetics and diet. This overview surveys the phenomenon of feline sweet blindness, in which cats lack a functional sweet-taste receptor because a required gene has become non-functional. As obligate carnivores that thrive on a meat-based diet low in carbohydrates, cats gain little from detecting sugars, and the loss of the sweet receptor reflects this dietary specialization. The survey relates sweet blindness to the broader evolutionary loss of unused taste capacities in carnivores and to the cat's distinctive feeding behavior. It discusses how cats select food based on other cues, including amino acids, fat, and texture, rather than sweetness. Understanding sweet blindness explains why cats ignore sugary treats and grounds a familiar behavioral quirk in sensory genetics, illustrating how an animal's diet shapes which tastes it can and cannot perceive.