If you're attempting to make home-baked bread but don't have any yeast (and don't want to run to the store), don't worry, you have options! The way yeast works is this: it's a fungus that reacts with water and then eats the sugar in the flour of your dough to create carbon dioxide bubbles. Those bubbles create air pockets in the dough, which makes it rise. There are other easy kitchen ingredients that will have much the same effect as yeast if you don't have any actual yeast on hand, though. So don't worry, bread-lovers, we've spelled it all out for you in the gallery ahead.