Yeast is used for leavening and fermenting. Although its processes were not fully understood at the time, humans began using yeast for these purposes more than 5,000 years ago. Yeast is occasionally added to the diet for its nutritional properties as well, especially by vegans.
brewer’s yeast, nutritional yeast, baker’s yeast
One tbsp of yeast contains:
35 calories, 2.5 g fiber and 4.6 g protein
Yeast is rich in thiamin, riboflavin, niacin, folate, vitamin B6, Pantothenic acid, iron, phosphorus, and potassium