Why does sourdough bread rise without commercial yeast?

Sourdough bread rises because tiny living creatures called wild yeast and bacteria work together to make it fluffy.

Imagine you're playing with a balloon, when you blow air into it, it gets bigger. That's kind of what happens in sourdough. The wild yeast eats the sugar in the flour, and as it eats, it produces carbon dioxide, which is like invisible air bubbles inside the dough. These bubbles make the bread rise.

In the dough, there are two main workers:

1. Wild yeast, they're like tiny chefs who eat sugar and make bubbles.
2. Bacteria, they help keep things going and give sourdough its tangy flavor.

These tiny workers don’t need to be added from a store, they live in the air around us, just waiting for someone to invite them into the flour!

Unlike commercial yeast, which works quickly, wild yeast takes time. It’s like baking cookies slowly in the oven instead of popping them in the microwave. That slow rise is what gives sourdough its special flavor and chewy texture, it's like a bread version of a cozy, long nap!