Tea after meal is greasy and unscientific coffee affects six parts of the body.

Now that the economic conditions are good, many friends have formed a good habit of drinking tea, which should be advocated. However, nutritionists online from family doctors disagree with another habit of "after-dinner tea". No matter at home or in a restaurant, as long as you eat a lot of greasy food, you should drink more tea to help digestion and relieve greasy. This statement is unscientific and cannot be advocated from a healthy diet point of view.

Experts say many people can't drink tea at all. Tea contains 2% to 5% caffeine, while strong tea contains even more caffeine. Excessive caffeine can lead to nerve overexcitation and insomnia, as well as rapid heartbeat, which is bad for coronary heart disease patients with tachycardia, premature beats and atrial fibrillation. And the concentration of caffeine and theophylline in strong tea is too high, which increases the excitability of the central nervous system after drinking, which can lead to accelerated gastric peristalsis, hypersecretion of gastric parietal cells, increased gastric acid, enhanced stimulation of gastric mucosa and easy to lead to gastric ulcer. Caffeine can also be addictive, creating a vicious circle.

Drinking tea after meals not only leads to indigestion, but also increases the risk of stones. "Tea contains tannic acid and theophylline, both of which affect the body's digestion of food." Gastric juice and intestinal juice are essential for the human body to digest food, but when tannic acid enters the gastrointestinal tract, it will inhibit their secretion, resulting in indigestion. In addition, tannic acid can also coagulate with proteins in meat, eggs, bean products, dairy products and other foods, forming tannic acid protein coagulants that are not easy to digest. If the food you eat contains metal elements, such as iron, magnesium, etc., tannic acid may also react with them, which can form stones over time. In addition, gastric acid is acidic, while tea is alkaline, and drink tea immediately after a meal. Theophylline will not only inhibit the secretion of gastric acid, but also dilute it, affecting the secretion of protease in gastric acid, thus affecting digestion.

The most scientific thing is to drink tea half an hour after a meal, while for pregnant women, tea contains caffeine, so it is best to drink less.

Coffee affects 6 parts of the body

1. Heart. Caffeine acts on the heart in two ways: in addition to affecting the brain center that regulates the cardiovascular system, caffeine also acts directly on the heart. High doses of caffeine can increase the heartbeat of people who do not tolerate caffeine by 10 to 20 beats per minute and may cause temporary arrhythmias in some people.

Therefore, moderate consumption of drinks containing caffeine (an average of up to 500 mg per day) does not significantly increase the risk of heart disease, but exceeding this dose may increase the risk of myocardial infarction.

2. Kidney. It is a common occurrence for many people to go to the toilet after drinking coffee in the morning. This is because caffeine affects adenosine receptors in the kidneys, acting like diuretics. Caffeine may also slow the brain's release of an antidiuretic hormone that reduces urine production.

3. Digestive system. The acid, oil and caffeine in coffee may stimulate gastric mucosa and promote gastric acid secretion. Long-term consumption of drinks containing caffeine can lead to stomach problems.

4. Respiratory system. Caffeine and similar drugs have two effects on respiration. One is to increase the respiratory rate. In addition, caffeine relaxes the smooth muscle around the trachea, thus dilating the trachea and increasing breathing. However, caffeine can not be used as a drug to treat asthma.

5. Reproductive system. Studies have shown that women who drink coffee during pregnancy give birth to babies with lower birth weight. Other studies have shown that taking caffeine (equivalent to drinking more than one cup of coffee a day) may significantly reduce women's chances of getting pregnant.

6. Eyes. Caffeine constricts (narrows) the microvessels of the eyes, reduces the amount of nutrients that enter the cells of the eyes, and slows down the rate at which the eyes remove waste.