Xiao Wang, 24, read an article on the Internet some time ago, in which he pointed out that the yeast commonly used by people may contain more toxins, which will increase the risk of cancer in the body.

Xiao Wang has been in a state of fear since reading this article. After all, the human body is extremely fragile and small compared with diseases, and no one can stop the arrival of diseases or inhibit the spread of cancer cells.

Seeing his mother steaming steamed bread with yeast at home, Xiao Wang quickly stepped forward to stop it. Although Xiao Wang's mother promised not to use yeast in the future, she always secretly steamed steamed buns with yeast.

Xiao Wang's mother thinks that there is nothing wrong with the old people who have eaten steamed bread and yeast fermented steamed bread all their lives. What is said on the Internet is just a rumor and has no scientific basis. Is there any scientific basis for the claim that yeast causes cancer? Might as well listen to the expert's answer. # Philharmonic Health Guide #

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What is yeast?

Yeast is a unicellular fungus, a tiny unicellular microorganism invisible to the naked eye, which can ferment sugar into alcohol and carbon dioxide. Yeast is widely distributed in the whole nature, is a typical liquid oxygen microorganism, can survive under anaerobic and aerobic conditions, and belongs to natural starter.

With the change of national diet concept and production level, more and more people realize the importance of yeast. In order to make the food more fluffy and delicious, most people who make bread and steamed bread will put yeast powder in it to ferment flour in advance to make the food more delicious.

Yeast likes to grow in a slightly acidic and humid environment and is a commonly used biological starter. After adding yeast into flour, a large amount of yeast can be produced at a suitable temperature, and bacteria can propagate and decompose starch, so that protein in flour can absorb sugar in dough and produce carbon dioxide to ferment flour.

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Yeast causes cancer, and eating steamed bread and bread often is harmful to health? Is this statement correct?

Yeast is widely used. We often eat steamed bread, steamed buns, bread and all kinds of cakes. Some people think that yeast contains a lot of harmful substances. Regular consumption of food fermented by yeast will damage gastrointestinal health and induce the formation of gout stones.

1. Will yeast damage gastrointestinal health?

After research by relevant experts, it is found that there is no scientific basis for the statement that yeast damages gastrointestinal health. First of all, we should understand that although yeast will produce a lot of carbon dioxide during fermentation, this substance will not directly endanger human health.

The temperature of carbon dioxide produced by yeast needs to be kept at about 20~30℃. Once the temperature exceeds 47℃, yeast will be killed by high temperature, and naturally it will not ferment to produce carbon dioxide. In other words, when cooking delicious food, if the temperature exceeds 47℃, carbon dioxide will not be produced, and naturally it will not hurt the stomach.

2. Can yeast induce gout?

The argument that yeast can cause uric acid increase is because most people think that yeast is a food with high purine content, and sulfuric acid itself is extremely unfavorable to people with high uric acid.

Long-term intake of food with high purine content will increase the burden and pressure on the kidneys, increase the level of uric acid in the body, and then induce gouty joint diseases.

This statement has been confirmed by experts. They found that the purine content in yeast was as high as 559 mg100g, and yeast was indeed a food with high purine content.

It should be noted here that when the dosage of yeast exceeds 65,438+000g, it will only produce more purines. The weight of a packet of yeast is about 5g, which can make the dough swell about 1kg. If 100g yeast is used continuously, it needs a lot of flour, so it is impossible for human body to consume a lot of flour in one day. Therefore, occasionally fermenting food with yeast will not lead to an increase in uric acid in the body.

3. Can yeast cause cancer?

The claim that yeast causes cancer is also completely exaggerated.

As a malignant tumor disease originating from epithelial cells, cancer is extremely harmful to human health. With the change of people's living standard, more and more people get different degrees of cancer for various reasons.

Once it happens, it will bring great threat and influence to the body. The biggest difference between cancer cells and ordinary cells is that they have the characteristics of rapid spread, which can spread to the whole body in just a few weeks or even days until the functional lesions of various organs and tissues in the whole body affect health and endanger life.

There are many reasons for cancer. It is impossible to stand firm by eating yeast alone to cure cancer. Rumors stop with wise men. I hope everyone will face it rationally.

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Matters needing attention in safe use of yeast

1, select the appropriate temperature.

The temperature range of yeast activity is 4-40, and the optimum temperature is 25-35. If the temperature is lower than 10 or higher than 45, the yeast activity will be greatly reduced. When the temperature is lower than 4, the fermentation will stop completely, and the yeast will not die at -60.

Once it exceeds 55, the yeast will die in a short time, so the water temperature for dissolving yeast should not be too low or too high.

2.ph value

Yeast can grow in the PH range of 3.0-7.5. When the PH value is lower than 2 or higher than 8, the fermentation will be greatly hindered. The optimum pH value for yeast fermentation is 4.5-5.

3. Use of yeast

The amount of yeast varies according to the type of food.

Generally speaking, according to fresh yeast, the yeast content of toast is 2%, sweet bread is 3%-4%, and the yeast content of steamed bread and steamed buns is about 65438 0%. When making food, the amount of yeast should be adjusted appropriately according to the temperature, practice and the use of auxiliary materials at that time.

When making frozen dough, it is necessary to increase the amount of yeast, because freezing will make the water inside the yeast freeze and expand, destroy yeast cells, and cause a large number of yeast deaths, thus reducing the fermentation capacity of yeast.

Freezing will kill 20%-30% yeast. Most of the frozen dough is made of high proportion of bread, because there are a lot of sugar, eggs and grease in the high proportion of bread, which improves the frost resistance of dough.