Major taste loss in carnivorous mammals

This comparative study examined taste-receptor genes across a range of carnivorous mammals and found widespread loss of taste capabilities tied to diet. Building on the earlier discovery that cats lack a functional sweet receptor, the authors surveyed many species and showed that animals with restricted or specialized diets have repeatedly lost taste receptor genes, including those for sweet and, in some lineages, other taste qualities. Strict carnivores and species that swallow food whole tend to accumulate inactivating mutations in taste genes that no longer serve a purpose. The work placed the cat's sweet blindness within a broad evolutionary pattern, demonstrating that feeding ecology repeatedly drives the degeneration of unused taste receptors across the carnivore radiation. It reinforced the principle that an animal's sensory genome reflects its diet, with taste capacities gained or lost according to what the species actually eats.