Health effects of tea

8 Side Effects of Green Tea you should be aware of || Health Tips ...

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Although health benefits have been assumed throughout history using Camellia sinensis as a regular beverage, there is no high-quality evidence that tea provides significant benefits. In clinical studies early in the 21st century, tea has been extensively studied for its potential to reduce the risk of human disease, but none of this research is conclusive in 2017.

In areas without access to safe drinking water, boiling water to make tea effective for reducing waterborne disease by destroying pathogenic microorganisms.

Video Health effects of tea

By constituents or substances

Aluminum, iron and other metals

Tea drinks account for a high proportion of aluminum in the human diet. The levels are safe, but there are some concerns that aluminum traces may be associated with Alzheimer's disease. A 2013 study also indicated that some tea types contain lead (mostly Chinese) and aluminum (mixture of India/Sri Lanka, China). There is still insufficient evidence to draw firm conclusions about this.

Most studies found no association between tea intake and iron absorption. However, drinking excessive amounts of black tea may inhibit the absorption of iron, and can harm people with anemia.

Concern has arisen about the traditional method of boiling too much tea to produce the herb, which can increase the amount of environmental contaminants being released and consumed.

Fluoride Exposure

All tea leaves contain fluoride; However, adult leaves contain as much as 10 to 20 times the levels of young leaf fluoride from the same plant.

The fluoride content of the tea leaves depends on the method of picking the leaves used and the fluoride content of the grown soil; Tea plants absorb this element at a greater rate than other plants. Care in selecting locations where plants grow can reduce the risk. It is estimated that preferred tea will contain less fluoride than tea harvested by the machine, as there is a lower chance of harvesting older leaves during the harvesting process. A British study in 2013 of 38 teas found that cheaper British tea supermarket blends had the highest fluoride levels of about 580 mg per kilogram, an average green tea of â€‹â€‹about 397 mg per kg and a pure mixture of about 132 mg per kg. The researchers suggest that economic tea can use older leaves that contain more fluoride. They calculated that someone who drank a liter of economic tea per day would consume about 4 mg of fluoride, the maximum recommended amount of fluoride per day but below the maximum amount of fluoride 10 mg per day.

Oksalate

Tea contains oxalate, excessive consumption which can cause kidney stones, as well as binding with free calcium in the body. Bioavailability of oxalate from tea is low, so a negative effect that may require a large intake of tea. Massive black tea consumption has been associated with renal failure due to high oxalate content (acute oxalate nephropathy).

Theanine and caffeine

Tea also contains theanine and caffeine stimulants of about 3% of its dry weight, which translates between 30 mg and 90 mg per 8 oz (250 ml) cup depending on the type, brand and method of brewing. Tea also contains a small amount of theobromine and theophylline. Dry tea has more caffeine than dry coffee; However, drier coffee than dry tea is used in a typical beverage preparation, which results in a cup of tea containing caffeine significantly less than a cup of coffee of the same size.

Caffeine in tea is a mild diuretic. However, the British Dietetic Association has suggested that tea may be used to increase normal water consumption, and that "tea and coffee style and the amount we drink in the UK are unlikely to have a negative effect [on hydration]".

Maps Health effects of tea

Provided

Cognitive effects

Drinking caffeinated tea can improve mental alertness. There is preliminary evidence that caffeine from long-term tea (or coffee) consumption provides small amounts of protection against the development of dementia or Alzheimer's disease during aging, although results in many studies are inconsistent.

Cancer

In 2011, the US Food and Drug Administration (FDA) reported that there is very little evidence to support the claim that consumption of green tea may reduce the risk of breast and prostate cancer.

The US National Cancer Institute reports that in epidemiological studies and several clinical trials of tea for cancer prevention, the results have been convincing. The Institute "does not recommend for or against the use of tea to reduce the risk of any type of cancer."... "Inconsistencies in study findings about tea and cancer risk may be due to variability in tea preparation, tea consumption, bioavailability of tea compounds (body absorbable amounts), lifestyle differences, and individual genetic differences." Despite some positive evidence for reducing the risk of breast, prostate, ovarian, and endometrial cancer with green tea, it is weak and unconvincing.

The meta-analysis of observational studies has concluded that black tea consumption does not seem to protect against the development of oral cancer in Asian or Caucasian populations, development of esophageal cancer or prostate cancer in Asian populations, or lung cancer progression.

Cardiovascular Disease

In the initial long-term clinical study, consumption of black tea showed evidence to provide small, reduced risk of stroke, whereas, in other reviews, green tea and black tea had no significant effect on the risk of coronary heart disease. Two reviews of randomized controlled trials concluded that long-term black tea consumption slightly lowered systolic and diastolic blood pressure (about 1-2 mmHg), a limited evidence-based finding. A review of Cochrane 2013 found some evidence of the benefits of tea consumption on cardiovascular disease, although more research is needed.

Fracture risk

Tea consumption does not seem to affect the risk of fractures including hip fractures or humerus fractures in men or women.

Weight

Although green tea is generally believed to be a weight-loss tool, there is no good evidence that long-term consumption has significant benefits in helping overweight or obese people to lose weight, or help maintain a healthy weight. The use of green tea for weight loss efforts carries a small risk of side effects, such as nausea, constipation, and abdominal discomfort.