Drinking tea to prevent cancer or cause cancer? Half a million Chinese study: drinking tea may increase the risk of stomach cancer

" It's three o'clock, let's drink tea first! "This is a very popular "stalk" on the Internet some time ago.

Speaking of tea, tea originated in our country and has been spread for more than 4,000 years.

The elders in the family always like to make a pot of tea and savor it after chatting.

However, in modern times, everyone began to raise their own questions about tea:

"Is tea anti-cancer or cancer-causing?"

Bad change?"

So what is the truth?

1. Does drinking tea prevent cancer or cause cancer?

To solve this problem, we must first know the ingredients in tea.

Generally speaking, dried tea leaves contain 93%-96.5% organic matter and 3.5%-7% inorganic matter. Among them, tea polyphenols, tea polysaccharides, theanine, alkaloids and other biologically active ingredients have a high proportion , which has antibacterial, antioxidant, anti-inflammatory and even immune regulation effects .

However, regarding the question of whether drinking tea to prevent cancer or cause cancer, different studies of have different conclusions .

In 2019, some scholars conducted a survey involving 5 cities and 5 rural areas in my country, including 500,000 people between 30-79 years old, the purpose is to evaluate tea drinking and cancer Relationship , specific to 6 types of cancers including stomach cancer, lung cancer, breast cancer, and cervical cancer.

survey results found that after eliminating high-risk factors related to cancer such as smoking and drinking, drinking tea has nothing to do with the risk of five cancers, but has a certain risk of gastric cancer. Link . When drinking tea, people who added more than 4g of tea in have a significantly increased risk of gastric cancer .

Researchers believe that may be related to excessive caffeine in tea .

2. What are the changes in the body after long-term tea

Then,Is drinking tea for a long time good for the body? Take a look at the following evidence:

The relationship between drinking tea and the cardiovascular system . The

study conducted a 6-year follow-up study of more than 80,000 Chinese people. The results found that the blood of people who drink tea for a long time has a blood vessel-protecting HDL cholesterol level drops more slowly At the same time, reduces the risk of cardiovascular disease by 8% .

Researchers believe that it is mainly tea polyphenols is at work. Tea polyphenols have antioxidant and anti-inflammatory effects, which help reduce blood viscosity, restore blood vessel elasticity, and reduce Blood lipids and so on.

The relationship between tea drinking and blood sugar

Researchers from Peking University School of Public Health analyzed more than 480,000 adults without diabetes and more than 30,000 adults with diabetes for 11 years After the follow-up data, it was found that:

In the non-diabetic population, People who drink tea every day Compared with people who never drink tea, has a 8% lower risk of developing type 2 diabetes . Among people with diabetes, people who drink tea every day have a 10% reduction in the risk of all-cause death from people who drink tea every day. .

The relationship between drinking tea and the brain

The tea polyphenols in tea can prevent oxidation, remove harmful inflammation in the body, and reduce the speed of aging of the brain. , Protect vascular endothelium and vascular function, prevent Alzheimer’s . A foreign study showed that drinking tea frequently can delay the time of senile dementia by 2-4 years .

Third and third groups of people should not drink tea

only,Although drinking tea has many health benefits, not everyone is suitable for drinking tea. The following three categories of people do not recommend drinking tea:

First, pregnant women , tea contains more tea polyphenols and caffeine, Will produce greater stimulation to the fetus, affects the normal development of the fetus .

Second, patients with liver disease , after the tea into the body to be metabolized through the liver, liver lesions for human existence itself, it can not be completely metabolized tea, tea will increase the burden on the liver, Further damage the liver tissue .

Third, urinary stones patients , tea contains oxalic acid, it will and the calcium contained in the urine to form stones.