Cats cannot taste sweetness — they lost the gene for sweet receptors 25 million years ago
Some trivia is so bizarre it forces you to rethink your entire understanding of the world. Check out the fact below, see how others reacted, and scroll down to dive into the verified science and history behind it.
Domestic cats (and all members of the cat family, from tigers to house cats) lack a functional gene for one of the two proteins needed to form the sweet taste receptor. The pseudogene (broken gene) has been confirmed in all tested feline species — they all have the same mutation that disables sweet perception. This makes biological sense: as obligate carnivores, cats have no need to detect carbohydrates. If cats show apparent preference for certain sweet foods, it's due to fat content or other flavour compounds, not sweetness.
Cats are famously indifferent to sweets in ways that puzzle many owners. Finding the genetic reason — that the entire cat family lost this sense 25 million years ago — makes cat behaviour feel less like a quirk and more like a deep evolutionary commitment to being a predator.
The Science Behind It
Domestic cats (and all members of the cat family, from tigers to house cats) lack a functional gene for one of the two proteins needed to form the sweet taste receptor. The pseudogene (broken gene) has been confirmed in all tested feline species — they all have the same mutation that disables sweet perception. This makes biological sense: as obligate carnivores, cats have no need to detect carbohydrates. If cats show apparent preference for certain sweet foods, it's due to fat content or other flavour compounds, not sweetness.
Why Your Brain Finds This Hard to Believe
OddlyHuman Editorial
VerifiedWritten and fact-checked by the OddlyHuman Behavioral Science Team. We verify all psychological, sociological, and historical claims against peer-reviewed journals, primary sources, and established encyclopedias to bring you accurate insights.
Read our Editorial Guidelines →“Cats cannot taste sweetness. The entire cat family lost the gene for sweet receptors 25 million years ago. If your cat likes certain 'sweet' foods, it's the fat — not the sugar. 🐱 #OddlyHuman”