***Similarity: Both are yeast in action. \x0d\Difference: \x0d\\old noodles is a variety of yeast in the air and mixing action, and each of the yeast "ability", or "power" size is not the same, resulting in a bad grasp of the fermentation time, it is very easy to hair over, steamed buns will be Sour, in order to avoid this situation, people will add baking soda (sodium bicarbonate), commonly known as "alkali" to neutralize it. This steamed out of the steamed buns within the yellow spots, and add less acid, add more alkali astringent flavor, it is not easy to grasp, and is not good for health! \x0d\\\\x0d\\and through professional cultivation of the pasta yeast, the strain is stable, rich in nutrients, fast fermentation, will not be acidic! No need to add alkali which is unhealthy for people! And the yeast fermentation process can fully destroy the phytic acid in the flour that affects the absorption of mineral plants, making the pasta more nutritious! \x0d\ So, the northern people who eat fermented pasta as their staple food are going to grow taller and more powerful than the southerners who eat rice!