Is steamed bread a traditional fermented product?

Yeast is often used when making steamed bread or bread. After fermentation, yeast can decompose glucose in flour and produce carbon dioxide, which is a gas that forms pores when it expands thermally, making steamed bread or bread soft and porous. Noodles and fried dough sticks do not use fermentation technology. It can be seen that the description in the question is wrong.

So the answer is: ×