"The feline passion for pyrophosphates might explain the animal's reputation as a picky eater. "We make [pet food] choices based on what we like," says Reed, "and then when they don't like it, we call them finicky." There is no way to know or imagine what the taste of pyrophosphate is like for cats. It's like a cat trying to imagine the taste of sugar. Cats, unlike dogs and other omnivores, can't taste sweetness. There's no need, since the cat's diet in the wild contains almost nothing in the way of carbohydrates (which include simple sugars). Either cats never had the gene for detecting sweet, or they lost it somewhere down the evolutionary road. Rodents,"