The Health Benefits of Green Tea

benefits of green tea

Many people have had questions on the health benefits of green tea. The green tea has a very calming effect on the body and it is from the presence of the L-theanine in this healthy tea. The L-theanine is an amino acid that is found naturally in green tea, L-theanine is said to reduce anxiety levels in the body, improve sleep, and reduce stress. This post will analyze the health benefits of green tea to the body and why this supplement is effective.

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Advocates and experts claim that L-theanine can help with a variety of health problems, example lowering anxiety, depression, high blood pressure, high cholesterol, insomnia, and also helps to lower stress.

L-theanine is also said to increase concentration, promote weight loss, and boost the human immune system. Also, some advocates suggest that L-theanine can be a used to prevent stroke, Alzheimer’s disease, and some forms of cancerous growths.

The Health Benefits of L-Theanine

Scientists have yet been to extensively explore the health benefits of L-theanine. But, preliminary research suggests it may help lift mood, enhance brain function, and calm the body’s response to stress and anxiety. Here’s a look at some key study findings:

1) Anxiety

The L-theanine may help to reduce anxiety, according to a study conducted in 2016. Healthy persons that participated consumed a drink containing 200 mg L-theanine or a placebo. One hour after it was taken, the stress response to a cognitive stressor was significantly reduced in those who took the L-theanine drink. Three hours after drinking, saliva cortisol (a hormone secreted in response to stress) was significantly lower.

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Another research explored the effects of taking  L-theanine daily  decreased subjective stress and saliva levels of α-amylase (an enzyme released in response to stress) in undergraduate students undergoing stress.

2) Sleep

A first step of the study examined the effects of a low-caffeine green tea on sleep quality (caffeine in green tea can interfere with sleep and may counteract the effect of theanine). After drinking green tea with low-caffeine daily for one week, saliva alpha-amylase levels were significantly lower in those who drank the low-caffeine green tea than in those who drank the normal green tea. Sleep quality was higher in persons who had consumed a larger quantity of  green tea with low-caffeine level.

3) Depression

Another study in the year 2017 published in Acta Neuropsychiatrica explored the use of L-theanine for major depression. Persons used in the trial were 20 men and women who had 250 mg of L-theanine added to their present medication for eight weeks. They discovered it yielded multiple benefits in reducing anxiety, sleep disturbances, and cognitive impairment related to depression.

4) Cognitive Function

A  study in 2010 from the Nutritional Neuroscience recommended that a combination of L-theanine and caffeine may help improve cognitive performance.

For the study, 44 young adults drank either a placebo or a combination of L-theanine and caffeine before they performed a demanding cognitive task. Researchers found that the combination of L-theanine and caffeine significantly increased accuracy and alertness. It also helped to increase focus while doing the cognitive task.

5) Weight Loss

L-theanine is seen to be something that would aid weight loss, according to preliminary animal-based research. In an experiment involving mice fed green tea powder, researchers found that L-theanine and caffeine found in the powder appeared to prevent weight gain and fight the accumulation of fat in the body.

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Side Effects of Green Tea

Up till now, little is known about the safety of using L-theanine supplements fofr a long time. L-theanine is generally considered safe when consumed in green tea, however, the National Institutes of Health cautions against drinking more than 5 cups of green tea daily.

Because of the caffeine content, too much consumption of green tea may also cause certain side effects. These side effects may include a headache, diarrhea, insomnia, irritability,  and heartburn.

There is also some concern that harmful effects may occur if L- theanine is taken  with sedatives, lipid-lowering medications, and/or drugs that are used in chemotherapy.

Because dietary supplements are largely unregulated,they have not been tested for safety. This is because the content of some products may differ from what is written on the product label.

You need to also have it in mind that the safety of supplements in pregnant women, nursing mothers, children, and persons having medical conditions or persons who are taking medications has not been established.

Where to Buy L-Theanine

Widely available for sale online, L-theanine supplements(GREEN TEA) are sold in many natural-food stores and in stores that sale dietary supplements.

L-theanine is also found in green tea. Although the content are different, a cup of tea contains around 25 mg of L-theanine.

benefits of green tea


While increasing your L-theanine intake by drinking green tea on a regular basis may help enhance your overall health, it is not right to recommend L-theanine supplements for any health condition.

If you’re considering the use of L-theanine supplements, discuss with your doctor first. Self-treating medical condition and avoiding or delaying standard care may have develop severe consequences that are unavoidable.