Vegetarian or vegan cat food has been available for many years, and is targeted primarily at vegan and vegetarian pet owners. Most veterinarians recommend against vegetarian diets for cats, as cats are obligate carnivores and require nutrients (including taurine, arachidonic acid, vitamin A, vitamin B12 and niacin) found in meat sources that cannot be obtained in sufficient amount in plant sources, although many can be synthesized. One study evaluated cats fed commercial and homemade vegetarian diets. The study found that all cats had serum cobalamin (vitamin B12) levels within the reference range and 3 of 17 cats had serum taurine values below the reference range.
Another study evaluated two vegan diets for nutritional adequacy. The study concluded that the two vegan diets analyzed did not meet the AAFCO minimal nutrient profile for cat diets. The authors recommended that these vegan diets should not be used as a sole source of nutrition for cats.
Source : http://en.wikipedia.org/wiki/Cat_food
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