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Title : What is Oolong tea and what benefits?
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What is Oolong tea and what benefits?

Oolong tea accounts for only 2% of tea in the world, but it is well worth discovering ( 1 ).

combines the qualities of the black and green teas, giving several interesting health benefits.

For example, you can increase metabolism and reduce stress, which helps you feel good every day.

This article explains everything you need to know about oolong tea and its health benefits.

What is Oolong tea?

Oolong tea is a traditional Chinese tea.

It is made from the leaves of the plant Camellia sinensis , the same plant used to make green tea and black tea. The difference is in how the tea is processed.

All tea leaves contain certain enzymes, which produce a chemical reaction called oxidation. Oxidation is what turns the green tea leaves into a deep black color.

Green tea is not allowed to oxidize much, but black tea is allowed to oxidize until it turns black. Oolong tea is somewhere between the two, so it is partially oxidized.

This partial oxidation is responsible oolong tea color and flavor characteristic ( 2 ).

This is what it looks like oolong tea:

However, the color of the leaves can vary between different brands, ranging from green to dark brown.

Conclusion :. Oolong tea is a traditional Chinese tea made from the partially oxidized leaves of the plant Camellia sinensis

The nutrients in tea Oolong

Al like the black and green tea, oolong tea contains several vitamins, minerals and antioxidants votes.

A cup of brewed tea contain about ( 3 4 ):

• Fluoride :. 5-24% of the IDR
• Manganese :. 26% of the IDR
• Potassium :. 1% of the RDI
• Sodium :. 1% of the RDI
• Magnesium :. 1% of the RDI
• Niacin :. 1% of the RDI
• Caffeine:. 36mg

Some of the major antioxidants in oolong tea, known as tea polyphenols are theaflavins , thearubigins and EGCG . These are responsible for many of their health benefits ( 5 ).

also contains Oolong tea theanine, an amino acid responsible for soothing effect of tea ( 6 ).

Conclusion :. In addition to caffeine, oolong tea contains vitamins, minerals, amino acids and antioxidant polyphenols beneficial tea

Oolong can help prevent diabetes

it is believed that

antioxidants found in tea polyphenols to help reduce blood sugar and insulin levels . They are also thought to increase insulin sensitivity ( 7 8 ).

Accordingly, several studies have reported links between regular consumption of tea, better control blood sugar and a lower risk of developing type 2 diabetes ( 9 10 11 12 ).

However, the specific effects of oolong tea are generally not as well documented as green tea or black.

That said, a recent review found that taking 24 oz (720 ml) oolong tea per day had a 16% lower risk of developing type 2 diabetes ( 13 ).

Another study reported that diabetics who consumed 50 ounces (1.5 liters) per day had to levels of blood sugar 30% lower at the end of a 30-day study ( 14 ).

Similarly, consumption of 33 oz (1 liter) of oolong tea every day for 30 days decreased the average sugar levels in the blood by 3.3% ( 15 ).

However, not all studies agree and one reported an increased risk of developing diabetes for those who drink 16 oz (480 ml) or more per day ( 16 , 17 , 18 ).

Researchers cite pesticide contamination likely to cause negative effects of this study, and can not recommend avoiding oolong tea because of it ( 18 ).

Conclusion: The polyphenol antioxidants can help maintain normal levels of blood sugar and reduce the risk of developing diabetes type 2. However, the evidence is mixed, and more research is needed.

Oolong can improve heart health

regularly consume tea antioxidants may also improve heart health ( 19 ).

Several studies of regular tea drinkers reported reduced levels of blood pressure and cholesterol and a lower risk of heart disease ( 20 21 22 23 , 24 ).

In a recent study, people who drank more than 48 ounces (1.4 liters) of tea per day were 51% less likely to have heart disease compared with non-tea drinkers ( 25 ).

Several studies have specifically investigated also oolong tea.

In a study of more than 76,000 Japanese adults noticed that those who drank 8 oz (240 ml) or more of oolong tea per day had a risk of heart disease 61% lower ( 26 ).

What is more, a study in China reported a risk 39% lower stroke in those taking 16 oz (480 ml) of oolong or green tea per day ( 27 ).

In addition, regular consumption of 4 oz (120 ml) of green tea or oolong per day can reduce the risk of developing high blood pressure by up to 46%. However, not all studies agree ( 28 29 ).

One thing to remember is that oolong tea contains caffeine , which can slightly increase blood pressure in some people. That said, this effect tends to disappear with regular consumption of caffeine ( 30 31 32 33 ).

Furthermore, since the content of caffeine in a cup of 8 ounces (240 ml) is only about a quarter of which is in the same amount of coffee this effect is likely to be small.

Conclusion :. Oolong tea can help lower the risk of heart disease, stroke and high blood pressure in some people

Oolong can help you lose weight

scientists believe that some of the polyphenols in oolong tea can increase metabolism and decrease the amount of fat absorbed from your diet ( 34 35 , 36 , 37 ).

It is also believed

These antioxidants polyphenols to activate enzymes that help to use stored fat for energy ( 37 ).

One study found that both full strength and diluted oolong tea helped participants burn more total calories 2.9-3.4% per day ( 38 ).

This could be partly due to caffeine content of tea, but tea polyphenols may also play a role. To test this idea, researchers compared the effects of caffeine alone to a combination of caffeine and tea polyphenols ( 37 38 ).

Both increased the amount of calories burned at around 4.8%, but only tea polyphenol and caffeine mix increases the fat burning capacity of participants ( 37 ).

This indicates that the effects of fat burning tea are also caused by plant compounds in tea, not only caffeine.

said, no studies could be found to clarify whether the increased energy expenditure and fat burning resulted in any substantial loss Weight in humans.

Moreover, some of the participants responded better than others, so the likely effects vary from person to person ( 37 ).

You can read more in this article about green tea and weight loss . Most of it should apply to oolong tea as well.

Conclusion: The combination of caffeine and polyphenols in oolong tea can help increase the amount of calories and fat burned each day. Ultimately, it could help accelerate weight loss.

Oolong can improve brain function

Recent reviews show that tea can help maintain brain function and prevent Alzheimer's disease ( 39 , 40 , 41 ).

In fact, several tea components can benefit brain function.

First, caffeine is shown to increase the release of norepinephrine and dopamine. It is believed that these two brain messengers to benefit mood, attention and brain function ( 42 43 ).

more research shows that theanine , an amino acid in tea can also help increase attention and relieve anxiety ( 44 ).

A recent study reports that tea contains caffeine and theanine increases alertness and attention within the first 1-2 hours after consumption ( 44 ).

also believed

Tea polyphenols have a calming effect, especially from two hours after intake ( 44 ).

Few studies have specifically looked oolong tea, but found that regular tea drinkers had a risk of up to 64% lower decrease in brain function. This effect was particularly strong for regular drinkers of black tea and oolong tea ( 45 ).

Another related study regularly drink green tea, black or oolong to improve cognition, memory, executive function and speed of information processing ( 46 ).

Although not all studies found the same beneficial effects of oolong tea in brain function, none showed negative effects ( 47 ) were found.

Conclusion :. The content of caffeine, antioxidants and theanine tea may have beneficial effects on brain function and mood

may protect against certain cancers

scientists believe that antioxidants present in black, green and oolong tea may help prevent cell mutations that can lead to cancer in the body ( 48 49 ).

tea polyphenols may also decrease the rate of division of cancer cells ( 50 ).

What is more, a review reports that regular tea drinkers may have a lower risk 15% of developing oral cancer ( 51 ).

Other reviews report similar protective effects for lung, esophagus, pancreas, liver and colorectal ( 52 53 54 55 56 57 ).

However, most research reports that tea has little or no effect on breast, ovarian and bladder cancers ( 58 59 60 ).

In addition, most research in this area focus on the effects of green tea or black, with the largest known effects of green teas.

Because oolong tea falls halfway between green and black tea, you can expect similar benefits. However, more research specifically oolong tea is needed.

Conclusion :. Like the green and black tea, oolong tea may have protective effects against cancer

Oolong Promotes teeth and bone strength

the antioxidants found in oolong tea can help keep teeth and bones strong.

One study showed that people who drank black, green or oolong tea daily over a period of 10 years had a 2% higher total bone mineral density ( 61 ).

In a study of 680 postmenopausal Chinese women found that those who drank oolong tea regularly had a bone density 4.5 to 4.9% higher than non-tea drinkers ( 62 ).

In addition, several other recent reviews report similar positive effects of tea on bone mineral density ( 63 64 ).

A higher bone mineral density may decrease the risk of fractures. However, the direct link between oolong tea and fractures has not been investigated yet.

Finally, research linked tea consumption to reduced dental plaque. Oolong tea is also a rich source of fluoride, which could help strengthen tooth enamel ( 50 ).

Conclusion: Oolong tea can help increase bone mineral density. It can also strengthen the tooth enamel and reduce the formation of dental plaque.

Oolong can help relieve eczema

The polyphenols in tea may also have some anti-allergic properties.

In a study asked 118 patients with severe cases of eczema to drink 33 oz (1 liter) of oolong tea per day, while maintaining their normal treatment.

improved the symptoms of eczema and at 1-2 weeks in the studio. After 1 month of combination treatment, 63% of patients showed improvement.

What is more, the improvement persisted. Still were observed in 54% of patients in 5 months later ( 65 ).

Conclusion :. The antioxidant polyphenols in oolong tea can help relieve the symptoms of eczema, and improvements can last a long time

Safety and side effects

oolong tea has been consumed for centuries and is generally considered safe.

That said, it contains caffeine.

When consumed in excess, caffeine can lead to anxiety, headaches, insomnia, irregular heartbeat and some high blood pressure ( 66 67 , 68 , 69 ).

In addition, consuming too many antioxidant polyphenols can make them act as pro-oxidants, which are not good for your health. Excessive intake can occur from taking supplements of polyphenols, but this is unlikely since just drink tea ( 66 ).

Flavonoids in tea can also link the iron found in plant foods, reducing the absorption of the digestive system to 15-67% ( 70 ).

People with low iron levels should avoid drinking tea with meals and consider eating foods rich in vitamin C to help increase iron absorption ( 71 ).

Both the USDA and the European Food Safety Authority (EFSA) consider the daily intake of 400 mg of caffeine is safe. This is equivalent to 48-80 ounces of oolong tea (1.4-2.4 liters) per day ( 72 , 73 ).

Given that the average cup is 8 oz (240 ml), you could drink a total of 6-10 cups of oolong tea per day without consuming too much caffeine.

However, it is advised pregnant women stick to a maximum of 200 mg of caffeine, which is about 3-5 cups of oolong tea per day ( 74 ).

Please note that coffee refresh , energy drinks and chocolate also contain caffeine. So if you are trying to reduce your intake, make sure to account for these sources.

Conclusion :. drinking up to 10 cups of oolong tea per day is generally considered to be safe for most people

Take Home Message

Oolong tea can not be as well known as green tea or black, but has similar health benefits. These include benefits for the heart, brain, bones and dental health.

In addition, it can increase metabolism, reduce the risk of developing type 2 diabetes and protect against certain cancers.

At the end of the day, oolong tea is a very healthy and tasty lifestyle for addition. Give it a try -. You will not be disappointed

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