Yeast Extract

Yeast extract is the soluble part of yeast cells, collected after the cell walls are broken and removed. Pet food uses it in small amounts as a flavor. Tufts veterinary nutritionists describe cats as carnivores, so yeast extract plays a minor part next to animal protein. We found no FDA restriction on it in pet food. Ask your veterinarian if your cat has a food allergy or medical condition.

Source: sites.tufts.edu

Yeast extract is added mainly for taste. It has a strong savory, broth-like flavor that can make food more appealing to picky cats. It also adds small amounts of B vitamins and protein. Because it is potent, makers need only a little of it.

Yeast extract is made by breaking open yeast cells, letting the yeast's own enzymes or added enzymes break down the contents, and then separating out the cell walls. What is left is the soluble part, which is dried into a paste or powder. The yeast is often brewers or bakers yeast.

No. The common claim that yeast keeps fleas away has not been shown scientifically. The tiny amount of yeast extract in a cat food would not change that. A cat still needs a flea prevention product, and your veterinarian can recommend one that fits its age and weight.

Pettings gives yeast extract 3 out of 5 and lists it as a yeast ingredient. It appears on 2 of the 149 dry cat foods we list. It is uncommon in dry foods and usually appears low on the list. Each food's page shows how it scores overall.