Which vitamin must cats obtain through their diet because they cannot produce it?

Cats require taurine in their diet because they are unable to synthesize it on their own. This amino acid plays a crucial role in numerous physiological processes in cats, including proper function of the heart, vision, and reproduction. Unlike many animals that can convert certain amino acids into taurine, cats have a specific dietary requirement for it, which means they must obtain it through their food.

While other vitamins and nutrients may have some dietary restrictions for different species, taurine is specifically critical for feline health. For instance, while some options listed may be important, such as Vitamin A, Vitamin D, and Niacin, cats can convert other substances into those vitamins, whereas taurine is unique in that cats have a strict dietary requirement for it. Thus, for cats, ensuring an adequate intake of taurine through their diet is essential to prevent health issues such as heart disease and vision problems.