Yeast extracts are made of the cell contents of yeast without the cell walls. There are two kinds of yeast extract, autolyzed and hydrolyzed. In autolyzed yeast, the enzymes found in the yeast itself are used to break down the proteins. In hydrolyzed yeast, these enzymes are added to the yeast. Yeast extract can be found as a thick gel or in a moist powdered form.
Is it healthy too?
Yeast extract is very high in B vitamins, so it's a cheap source of these vitamins.
Check the “best before” date on the package. Most of the time manufacturers clearly mention the use of yeast extract by listing it on food labels. Sometimes, “natural flavors” or “additives” also can mean yeast extract is used.
Yeast extract is high in sodium. It must be avoided by those having high blood pressure or those who want to limit sodium intake.(2)
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