packet of yeast
Yeast is a good source of B vitamins and minerals; however, quantities used in baking are too small to provide significant nutritional contribution to finished baked goods.
About
Yeast is a single-celled fungus, most commonly Saccharomyces cerevisiae, used as a leavening agent in baking and fermentation. Active dry yeast and instant (bread) yeast are the most prevalent forms available to home and professional bakers. These products consist of dormant yeast cells mixed with inert carriers and are derived from selected strains cultivated for reliable fermentation performance. When rehydrated and combined with flour, water, and favorable conditions (warmth and food sources), yeast cells metabolize sugars, producing carbon dioxide gas that creates rise in dough, and alcohol and flavor compounds that develop complexity in the final product. Fresh yeast, while less shelf-stable, contains living yeast at higher concentrations and produces slightly different fermentation kinetics than dried forms.
Culinary Uses
Yeast is essential in bread baking, where it generates gas for leavening and contributes to crust development and crumb structure. It is also fundamental in beer and wine production, where yeast ferments sugars into alcohol and develops characteristic flavors. In baking, yeast is incorporated into doughs for yeasted breads (sandwich loaves, artisan breads, rolls), pastries, doughnuts, and sweet doughs. Temperature, hydration, salt content, and fermentation time all influence yeast activity and final flavor profile. Proper activation and proofing techniques ensure consistent results across applications.