Some people say that tea is acidic because drinking tea to scrape the stomach helps digestion; some people say that tea is alkaline because it contains theophylline. Is tea acidic or alkaline?
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What is alkaline food?
The point that everyone cares about this question is actually "is tea an alkaline food". In the study of food chemistry, food can be divided into acidic food and alkaline food. It is generally believed that alkaline foods are more beneficial to human health.
So, how to distinguish between acidic food and alkaline food? Acidic foods and alkaline foods are not determined by their apparent and direct pH value, but by their "hydrolyzed products" in the body.
If the metabolites contain cations such as calcium, magnesium, potassium, and sodium, it is an alkaline food; on the contrary, a food with more sulfur and phosphorus is an acidic food. Although vinegar and apples taste sour, they are alkaline foods. Why is
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tea soup acidic?
PH test paper test results are confusing, because whether it is green tea , black tea, dark tea, etc., all tea soups are acidic. The data shows that most of the tea products, such as green tea, scented tea, oolong tea , black tea, and raw Pu'er tea, are weakly acidic, and the pH value is generally around 5.5-6.5.
In fact, the substances that make tea soup acidic are mainly "tea polyphenols" and "tannic acid". The content of these acidic substances is relatively high, and they dissolve faster, and the theophylline substances begin to dissolve in the later period, so the tea soup will be acidic. Because acidic substances are more likely to stimulate the stomach, and tea soups are all acidic, which can explain why people with bad stomachs should not drink too strong tea soup.
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Is tea an alkaline food?
From a scientific point of view, the content of , potassium , sodium, calcium, and magnesium contained in tea is mostly, and it is formed into an alkaline solution after hydrolysis. Therefore, tea is an alkaline food.
Is the tea alkaline or acidic is a very tangled question. Is the tea alkaline? NO! It should be said that tea is a strong alkaline food, and tea soup is acidic, which can adjust the pH of body fluids.
Is the tea soup we drink acidic or alkaline? Some people say that tea is acidic because drinking tea to scrape the stomach helps digestion, and some people say that theophylline is alkaline because it has theophylline. There are different opinions. This paper discusses and experiments on this issue.
Is the tea soup acidic or basic
The approximate range of acidity of the tea soup measured with a wide range of pH test paper. Generally speaking, the pH value of tea soup is in the range of 5.5-7, which are all weakly acidic. However, the strength of its acidity has a certain relationship with the type of tea, the brewing time and the age of the tea.
1. The acidity and alkalinity of different tea leaves are different. Green tea has the weakest acidity, while black tea and oolong tea are relatively more acidic, but both are weakly acidic, indicating that the pH of the tea soup is related to the type of tea and its production method.
2. The pH of tea leaves measured by different soaking times is also different. The acidity is the weakest when brewed for 5 minutes, close to neutral; the acidity of the tea soup after 15 minutes of brewing has increased and basically reached the maximum value, and the immersion time continued to be extended.
3. The pH of tea leaves with different degrees of tenderness is also different. The acidity of bud tea is relatively weaker than that of leaf tea, that is, the more tender the tea leaves, the weaker the acidity, and the older the tea leaves, the stronger the acidity.
Alkaline food is beneficial to human health.
Tea soup is acidic, but tea is a standard alkaline food. Alkaline foods are good for human health.
In fact, physiologically acidic foods and sour foods are completely different concepts. The acidity and alkalinity of food is not a simple judgment, but depends on the type and content of minerals in the food: potassium, sodium , Calcium, , magnesium , and iron show an alkaline reaction after entering the human body; after phosphorus, chlorine, and sulfur enter the human body, they are acidic.
For example, lemon juice is a sour food, but it is a physiologically alkaline food, because lemon juice is rich in potassium, and its contribution to body fluids is alkaline after being digested, absorbed and metabolized by the human body; while preserved egg is alkaline. food, but it is a physiologically acidic food.
The irritation to the stomach and intestines basically comes from the polyphenols substances and plant alkaloids contained in tea leaves, which are not very acidic or alkaline (plant alkaloids are not necessarily alkaline). Generally speaking, the higher the degree of fermentation of tea, the lower the irritation to the stomach, such as black tea, cooked Pu'er, aged tea, etc. Other conditions are the same, the heavier the twisting in the processing process, the faster the precipitation per unit time during brewing, and the higher the irritation to the stomach. The tea quality of scented tea depends on its tea embryo. If it is green tea, it will be colder and more irritating. If it is white tea, it will be slightly less irritating. But anyway, scented tea is not green tea. The degree of irritation is also related to the concentration of brewing. The precipitation of tea leaves is the same, but the concentration is different, and the irritation to the stomach will also be different. Decreasing the brewing concentration (by reducing the soaking time, reducing the proportion of tea, etc.) can reduce the irritation of the tea. Eating some refreshments while drinking tea, or avoiding drinking tea on an empty stomach, can effectively reduce the irritation of tea to the stomach.
Current research has found that black tea extract has an anti-ulcer effect and can promote the healing of ulcers caused by drugs such as aspirin and alcohol. Tea extract can also regulate the secretion of gastric acid and promote gastric motility. In mouse experiments, black tea can improve the motility of the gastrointestinal tract. The researchers believe that this may be related to the regulation of prostaglandin and other hormones and nitric oxide by tea ingredients. Experiments with guinea pigs found that black tea extract can promote intestinal peristalsis, and the active ingredient that acts on intestinal motility is probably thearubigin .
There are also studies that have found that black tea, green tea, and Pu-erh tea have certain antibacterial effects. Drinking black tea can reduce harmful bacteria in the digestive tract, such as Staphylococcus aureus. Among people who drink more Chinese tea, Helicobacter pylori The infection rate of bacteria was significantly reduced.
In short, drinking a cup of tea with meals will not affect digestion and absorption, and if you use tea to replace various soups, it can reduce the intake of salt in the day, which is beneficial for blood pressure control and is very worth promoting.
Summary: Tea has been a national drink for thousands of years; in a long time, tea has escorted the health of the Chinese people and contributed its own modest power. I believe that through this article, everyone can have a clear understanding of the pH of tea. With the continuous advancement of science and technology, our understanding of tea continues to deepen, and I believe that there will be more authoritative data and arguments to support the view that tea is a healthy drink.
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