Yeast is a substance that we often talk about. In fact, human beings have used yeast for fermentation for thousands of years. The ancient Egyptians who built the pyramids used fermented bread as their staple food, while our people used distiller's yeast to make wine in ancient times.
Yeast is actually a single-celled anaerobic eukaryotic microorganism, which belongs to biological starter.
After yeast is put into dough, it will produce yeast at actual temperature, which will propagate and decompose starch to form protein chain, absorb sugar in dough as nutrition, and finally produce a lot of carbon dioxide and alcohol to make dough rise.
In daily life, the godmother, which is widely used, has a lot of gossip about it some time ago. Many of them think that eating food fermented by yeast often will be vulnerable, and health is not only easy to induce stomach diseases, but also easy to induce gout problems.
In fact, this statement simply doesn't hold water. The argument that yeast can hurt the stomach mainly comes from carbon dioxide produced during fermentation, and the production of carbon dioxide requires very strict conditions.
The temperature needs to be kept at 20~30℃. Once the temperature exceeds 47℃, yeast will be killed by high temperature, and naturally it will not continue to ferment to produce carbon dioxide.
In other words, steamed yeast fermented food does not contain carbon dioxide, so the statement that yeast will hurt the stomach naturally does not exist.
Let's take a look at the situation that yeast is easy to cause gout attacks. Is it true or not? Some people say that yeast is a high purine food, which will easily increase, and uric acid level will induce gout, especially for people with high uric acid itself.
Indeed, the purine content in 100 g yeast is about 559 mg, which really belongs to high purine food, but the amount of yeast we use every time is not up to 100 g at all, and a packet of 5 g yeast can deliver two kilograms of flour.
These noodles can be made into many steamed buns. If the intake of staple food per meal is 100g, then the purine content in them can be said to be very small, so there is no need to worry about whether it will affect the uric acid level in the body and will not cause gout problems.
In daily life, there are some rumors that yeast will produce harmful substances at high temperature, and it is easy to cause cancer, so you must not eat freshly baked steamed bread and bread, and you must let it cool before eating. So is this statement true or false? In fact, this is also a rumor.
The cause of the rumor is that at high temperature, yeast will transform protein and sugar in flour to produce new aroma, color and taste, and then produce some harmful substances through Maillard reaction.
In fact, yeast is a kind of microorganism, which mainly produces its function in the fermentation stage, which is related to many factors such as yeast function, temperature, flour composition, pH value and so on.
Once the temperature exceeds 60, the yeast can't survive, but the temperature of toast can reach almost 200, while the temperature of steamed bread can reach 100, so the yeast will die before it reaches this temperature.
In other words, no matter from its own composition or production method, yeast will not be carcinogenic.
In fact, yeast is far more nutritious than you think. Appropriate and reasonable intake of some foods made of yeast at ordinary times can bring the following nutrition to the body:
All these nutrients can bring health benefits, and yeast is also a very strong antioxidant, which can help protect the liver and enhance its detoxification.
After fermentation, phytic acid in flour will be decomposed, which can promote the utilization and absorption of trace elements such as iron, calcium and magnesium. Chromium and selenium contained in yeast powder can effectively improve people's immunity and bring anti-aging effect.
Conclusion: Generally speaking, making pasta with yeast is not only simple and convenient, but also more in line with the nutritional needs of modern people. Using yeast not only does not cause cancer, but also belongs to healthy food. As long as it is used reasonably, there is no need to worry about bringing harm to the body.