Which is healthier, tea or coffee?

The researchers analyzed the results of 13 previous studies that showed that drinking coffee and tea could prevent kidney cancer, while drinking milk, soda and fruit juices seemed to have no effect on kidney health.

Previous studies have shown that people who drink three or more cups of coffee a day have a 16% lower risk of kidney cancer than those who drink an average of less than one cup of coffee a day, and those who drink only one cup of tea a day have a 15% lower risk of kidney cancer than those who do not drink tea.

The findings are published in the International Journal of Cancer Research.

Although the study does not directly prove that drinking coffee and tea can prevent kidney cancer, some scientific evidence can be found, the researchers said. The study was led by Dr. Jung-Eun Lee of Harvard Medical School in Boston.

For example, coffee and tea can increase the body's response to blood sugar regulatory hormones

The sensitivity of insulin. Insulin levels are the main factor affecting kidney health, the researchers said.

In addition, the researchers point out that antioxidants in coffee and tea protect kidney cells from damage.

The researchers analyzed the results of 13 long-term studies involving 530469 women and 244483 men. Each study initially collected dietary information about the subjects, and then followed them for a period of 7 to 20 years.

The findings are based on a combination of factors that may cause kidney cancer, such as obesity, smoking and high blood pressure.

"the results showed that drinking tea and coffee slightly reduced the risk of kidney cancer, while drinking drinks such as milk, juice and soda had no effect," the researchers wrote in the study. "

1. Coffee contains certain nutrients. Nicotinic acid in coffee contains vitamin B, which is higher in roasted coffee beans. And there are free fatty acids, caffeine, tannic acid and so on.

two。 Coffee is good for the skin. Coffee can promote metabolic function, activate digestive organs, and has a great effect on constipation. Taking a bath with coffee powder is a kind of thermotherapy, which has the effect of losing weight.

3. Coffee has the function of relieving alcohol. Drinking coffee after drinking alcohol will quickly oxidize the acetaldehyde converted from alcohol, decompose it into water and carbon dioxide and discharge it out of the body.

4. Coffee can relieve fatigue. In order to eliminate fatigue, we must supplement nutrition, rest and sleep, and promote metabolic functions, and coffee has these functions.

5. Three cups of coffee a day can prevent gallstones. For caffeinated coffee, it stimulates gallbladder contraction and reduces cholesterol, which is prone to gallstones. The latest Harvard University researchers found that men who drank two to three cups of coffee a day were less than 40% likely to get gallstones.

6. Drinking coffee regularly can prevent radiation damage. Radiation damage, especially the radiation of electrical appliances, has become a prominent pollution at present. Indian Barba atomic researchers have come to this conclusion in mouse experiments and say it can be applied to humans.

7. The health care and medical function of coffee. Coffee has the functions of anti-oxidation and heart protection, strengthening muscles and bones, benefiting waist and knees, appetizer, eliminating fat and accumulation, promoting orifice and dehumidification, promoting blood circulation and removing blood stasis, relieving wind and relieving spasm and so on.

8. The influence of coffee on mood. Experiments show that the average person absorbs 300 milligrams of caffeine (about 3 cups of brewed coffee) a day, which has a good effect on a person's alertness and mood.

Disadvantages:

1. Make a mess when you are nervous

Caffeine helps to improve alertness, agility, memory and concentration. But drinking more coffee than you are used to will produce the same dose of stimulants that you are used to, which can cause nervousness. For people with anxiety disorders, caffeine can worsen symptoms such as sweaty palms, palpitations and tinnitus.

two。 Aggravate hypertension

Caffeine is often combined with other simple painkillers because of its analgesic effect, but if you take it in large quantities for a long time, if you already have high blood pressure, using a lot of caffeine will only make your situation worse. Because caffeine alone can raise blood pressure, coupled with emotional stress, it can have a dangerous multiplication effect, so people at risk of high blood pressure should especially avoid drinking caffeinated drinks during stressful times at work. Some people who drink coffee all the year round think they are immune to the effects of caffeine, but this is not the case. One study shows that blood pressure can rise for up to 12 hours after drinking a cup of coffee.

3. Induce osteoporosis

Caffeine itself has a good diuretic effect, if you drink a lot of coffee for a long time, it is easy to cause bone loss, which will adversely affect the preservation of bone mass and may increase the threat of osteoporosis for women. But the premise is that people who don't get enough calcium in normal food, or people who don't move very often, plus women after menopause, calcium loss caused by lack of estrogen, coupled with a large amount of caffeine, may pose a threat to bones. If you can enjoy it in a reasonable amount, you can still stop eating for fear of choking.

In addition, the following six types of people are not suitable for drinking coffee:

Suffering from high blood pressure, coronary heart disease, arteriosclerosis and other diseases-long-term or heavy consumption of coffee can cause cardiovascular disease.

Older women-Coffee reduces calcium and causes osteoporosis. After menopause, women need to add ten times the amount of calcium every day.

People with stomach problems-drinking too much coffee can worsen stomach problems.

Pregnant women-drinking too much coffee can lead to fetal malformation or miscarriage.

People with vitamin B1 deficiency-vitamin B1 can maintain the balance and stability of the nervous system, and coffee has a destructive effect on it.

Cancer patients-drinking too much coffee is at risk of cancer to normal people

It is identified that there are about 500 kinds of compounds in tea. Some of these compounds are essential to the human body and are called nutrients. Such as vitamins, proteins, amino acids, lipids, sugars and mineral elements, they have high nutritional value to the human body. There are also some compounds that have health care and medicinal effects on the human body, which are called ingredients with medicinal value. Such as tea polyphenols, caffeine, lipopolysaccharide and so on.

1. Drinking tea can supplement a variety of vitamins that the human body needs.

Tea contains a variety of vitamins. According to its solubility, it can be divided into water-soluble vitamins and fat-soluble vitamins. Among them, water-soluble vitamins (including vitamin C and B vitamins) can be directly absorbed by the human body by drinking tea. Therefore, drinking tea is a good way to supplement water-soluble vitamins, and drinking tea regularly can supplement the body's need for a variety of vitamins. Vitamin C, also known as ascorbic acid, can improve the body's resistance and immunity. The content of vitamin C in tea is high, generally, the content can be as high as IO0 mg ~ 250mg per 100g green tea, and the content of high-grade Longjing tea is more than 360mg, which is higher than lemon, citrus and other fruits. Black tea, oolong tea due to the fermentation process, vitamin C was damaged by oxidation and the content decreased, every 100 grams of tea leaves only dozens of milligrams, especially black tea, the content is even lower. Therefore, the higher the grade of green tea, the higher its nutritional value. Only 10 grams of high-grade green tea per person per day can meet the daily vitamin C requirements of the human body.

Vitamin B1 in B vitamins is also called thiamine, B2 is also called riboflavin, B3 is also called pantothenic acid, B5 is also called nicotinic acid, B11 is also called folic acid. The content of B vitamins in tea is shown in Table 3.

As fat-soluble vitamins are insoluble in water, tea brewing with boiling water is also difficult to be absorbed and utilized. Therefore, appropriate "eating tea" is advocated to make up for this defect, that is, tea is made into ultra-fine powder and added to a variety of foods, such as tea tofu, tea noodles, tea cakes, tea candy, tea ice cream and so on. After eating these tea foods, the fat-soluble vitamins contained in tea can be obtained, which can give full play to the nutritional value of tea.

2. Drinking tea can supplement the proteins and amino acids that the human body needs.

The content of water-soluble protein in tea that can be directly absorbed and utilized by drinking tea is about 2%. Most of the protein is water-insoluble substance and exists in tea residue. There are more than 25 kinds of amino acids in tea, among which isoleucine, leucine, lysine, phenylalanine, threonine and valine are six of the eight essential amino acids. There is also histidine for the growth and development of babies. Although the content of these amino acids in tea is not high, it can be used as a supplement to the insufficient daily demand of human body.

3. Drinking tea can supplement the mineral elements needed by the human body.

Tea contains a large number of elements and trace elements needed by the human body. A large number of elements are mainly phosphorus, calcium, potassium, sodium, magnesium, sulfur, etc., and trace elements are mainly iron, manganese, zinc, selenium, copper, fluorine and iodine. For example, there is a high content of zinc in tea, especially green tea, with an average zinc content of 73 micrograms per gram of green strips, as high as 252 micrograms, and 32 micrograms of zinc per gram of black tea. The average content of iron in tea is 123 micrograms per gram of dried strips and 196 micrograms per gram of black tea. These elements play an important role in the physiological function of the human body. Drinking tea regularly is one of the important ways to get these mineral elements.