Tea is beloved by people all over the world.
Both green and black tea are made from the leaves of the Camellia sinensis plant (1).
The key difference between the two is that black tea is oxidized and green tea is not.
To make black tea, the leaves are first rolled and then exposed to air to trigger the oxidation process. This reaction causes the leaves to turn dark brown and allows the flavors to heighten and intensify (1).
On the other hand, green tea is processed to prevent oxidation and thus much lighter in color than black tea.
This article explores the research behind green and black tea to determine which one is healthier.
While green and black tea differ, they may provide some of the same health benefits.
Both green and black tea are rich in a group of protective antioxidants called polyphenols.
Specifically, they contain flavonoids, a subgroup of polyphenols.
However, the type and amount of flavonoids they contain differ. For example, green tea contains a much higher amount of epigallocatechin-3-gallate (EGCG), whereas black tea is a rich source of theaflavins (2).
The flavonoids in green and black tea are thought to protect your heart (2, 3).
One animal study found that green and black tea were equally effective at preventing blood vessel plaque formation by 26% at the lowest dose and up to 68% at the highest dose (4).
The study also found that both types of tea helped reduce LDL (bad) cholesterol and triglycerides (4).
Whats more, two reviews examining over 10 quality studies each found that drinking green and black tea can lower your blood pressure (5, 6).
Furthermore, another review of green tea studies found that people who drank 13 cups per day had a 19% and 36% reduced risk of heart attack and stroke respectively, compared with those who had less than 1 cup of green tea each day (7).
Similarly, drinking at least 3 cups of black tea could reduce your risk of heart disease by 11% (2).
Green and black tea both contain caffeine, a known stimulant.
Green tea contains less caffeine than black tea about 35 mg per 8-ounce (230-ml) cup, compared with 39109 mg for the same serving of black tea (2, 8, 9).
Caffeine stimulates your nervous system by blocking the inhibitory neurotransmitter adenosine. It also aids the release of mood-enhancing neurotransmitters like dopamine and serotonin (10, 11).
As a result, caffeine can boost alertness, mood, vigilance, reaction time, and short-term recall (9).
Green and black teas also contain the amino acid L-theanine, which is not present in coffee.
L-theanine is thought to cross the blood-brain barrier and trigger the release of an inhibitory neurotransmitter in the brain called gamma-aminobutyric acid (GABA), which brings about a relaxed but alert state (12, 13, 14).
At the same time, it promotes the release of the mood-enhancing hormones dopamine and serotonin (15).
L-theanine is thought to balance the effects of caffeine. The combination of these two substances may even be synergistic, as one study found that people who ingested L-theanine and caffeine together had better attention than when either was used alone (14, 16).
In general, there is slightly more L-theanine in green tea than black tea, though the amounts can vary considerably (14).
Both green and black tea are great alternatives to coffee for those who want a mood lift without coffees telltale restlessness.
Green and black tea contain polyphenols that have strong antioxidant effects, potentially reducing your risk of heart disease. Also, they both have caffeine to increase alertness and focus and L-theanine, which releases stress and calms your body.
Green tea is an excellent source of the potent antioxidant epigallocatechin-3-gallate (EGCG).
Though green tea contains other polyphenols, such as catechin and gallic acid, EGCG is considered to be the most powerful and likely responsible for many of green teas health benefits (17).
Heres a list of the possible benefits of the EGCG in green tea:
Though most of the research on the EGCG in green tea has been carried out in test-tube or animal studies, the findings lend credibility to the long-reported benefits of drinking green tea.
Green tea contains EGCG, an antioxidant that test-tube and animal studies have demonstrated can fight cancer and bacterial cells and protect your brain and liver.
Theaflavins are a group of polyphenols that are unique to black tea.
Theyre formed during the oxidation process and represent 36% of all polyphenols in black tea (30).
Theaflavins seem to offer many health benefits all related to their antioxidant ability.
These polyphenols can protect fat cells from damage by free radicals and may support your bodys natural antioxidant production (30, 31).
Whats more, they may protect your heart and blood vessels.
One animal study found that theaflavins can lower the risk of plaque formation in blood vessels by reducing inflammation and increasing the availability of nitric oxide, which helps your blood vessels dilate (32).
In addition, theaflavins have been shown to significantly reduce cholesterol and blood sugar levels (30, 33).
They may even promote fat breakdown and have been recommended as a potential aid for obesity management (34).
In fact, the theaflavins in black tea may have the same antioxidant capacity as polyphenols in green tea (35).
Theaflavins are unique to black tea. Through their antioxidant effects, they may improve blood vessel function and support fat loss.
Green and black tea offer similar benefits.
While they differ in their polyphenol composition, they may bestow the same beneficial effects on blood vessel function (36).
Most research indicates that green tea has stronger antioxidant properties than black tea, but one study found that green and black teas exhibited equally effective antioxidant capacities (35, 37, 38).
Though both contain caffeine, black tea usually has more making green the better choice for people sensitive to this stimulant. Furthermore, green tea contains more L-theanine, an amino acid thats calming and can balance the effects of caffeine (33).
However, if youre looking for a caffeine boost that is not as strong as coffee, black tea could be a great option for you.
Keep in mind that both black and green tea contain tannins, which can bind to minerals and reduce their absorption capacity. Therefore, tea may be best consumed between meals (39).
Green tea may have a slightly better antioxidant profile than black tea, but black tea is best if you want a powerful caffeine buzz.
Green and black tea provide similar health benefits, including for your heart and brain.
While green tea may contain more powerful antioxidants, the evidence does not strongly favor one tea over the other.
Both contain the stimulant caffeine and L-theanine, which has a calming effect.
In short, both are great additions to your diet.
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Green Tea vs. Black Tea: Which Is Healthier?
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