Web Reference: Mar 21, 2024 · In conclusion, bread expands in size during baking primarily due to the action of yeast. The yeast produces carbon dioxide gas, which gets trapped in the dough and causes it to rise and expand. This expansion can be quite dramatic, with a well-risen loaf increasing in size by about 20-30%. Jul 11, 2022 · As the crust of the bread hardens, the pressure inside of it builds up, which causes the bursting to happen. To release most of the air pressure, loaves of bread are slashed or scored on top. Dec 14, 2025 · The idea that bread expands dramatically in the stomach is a common misconception often driven by the uncomfortable feeling of fullness after a meal. This notion suggests an uncontrolled swelling of the food bolus that is not supported by the actual science of human digestion.
YouTube Excerpt: In this short video, we explain why most recipes call for 2
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