Yeast makes bread rise by interacting with sugars in flour to produce carbon dioxide bubbles, though the process requires kneading, heat and time for the leavening (rising) to begin before baking. Yeast breads also take longer to bake usually; Yeast Free Diet, Yeast Free Breads, No Yeast Bread, No Rise Bread, Bread Baking, Bread Food, Baking Soda, Cake Recipes Using Yeast, Yeast Free Recipes