Green Tea Therapy for Memory Impairment, Obesity, and Insulin Resistance

Green Tea is one of the most popular drinks in the world. It’s popularity has been increasing due to its health benefits. However, there are some negative aspects associated with drinking green tea such as insomnia, weight gain, and even diabetes. There are many studies which show that consuming green tea may cause memory impairment and obesity [1]. These studies were conducted mainly in animals but it was found that humans too could experience these adverse effects when they consume large amounts of green tea [2].

In addition to these studies, there are other research reports which showed that green tea contains caffeine. Caffeine is known to affect the central nervous system (CNS) and increase alertness. Studies have shown that caffeine consumption may reduce fatigue and improve mental performance [3]. Some researchers believe that caffeine may play a role in reducing anxiety or improving mood [4].

The problem with all of these studies is that they were done on rats and mice. They did not test humans.

There are several ways to measure caffeine levels in green tea. One way is through gas chromatography mass spectrometry (GC/MS). GC/MS can detect caffeine at very low concentrations, so it is used to determine the amount of caffeine present in beverages like green tea. However, it is very difficult to find the exact amount of caffeine in green tea because of many factors.

First of all, the amount of caffeine changes depending on how you prepare the tea (e.g. steeping time). Second, different varieties and brands of green tea contain different amounts of caffeine. Even the same brand can have different amounts of caffeine when processed in different ways.

Green tea is prepared and consumed in different ways in different parts of the world. In many Asian counties, it is most common to drink green tea without milk or sugar. This type of green tea is known as Lu’Cha in Tibet and in parts of China. In Japan and in some parts of China, people prefer drinking green tea with honey or sugar.

This type of green tea is known as Melyacio in Asia, particularly in Japan. The way green tea is consumed in the western world is different than in the eastern world. In the western world, green tea is prepared with milk and sugar. Some people like to add lemon juice or mint leaves to the beverage as well.

Green tea contains caffeine, which is a stimulant. Caffeine has been associated with improved alertness and reaction time, particularly when tired. It is also associated with improved mood and performance on memory tests. These effects are particularly noticeable when one has not consumed caffeine for a long time.

Green Tea Therapy for Memory Impairment, Obesity, and Insulin Resistance - Picture

However, the beneficial effects of caffeine tend to decrease with repeated consumption. This is known as a “ceiling effect” meaning that no more benefits are achieved even with increased consumption. Some people are very sensitive to the effects of caffeine and develop health problems when they consume moderate amounts. These health problems may include insomnia, restlessness, stomach aches and other problems. Pregnant women are particularly sensitive to the effects of caffeine and may have health problems when consuming moderate amounts of caffeine. Caffeine is also removed from the body by the liver and people with certain health conditions (e.g. liver disease) may not be able to process the caffeine as quickly which may result in adverse effects. Finally, people who have a sensitivity to caffeine may be affected differently by different types of beverages such as coffee, tea, soft drinks or energy drinks.

Green tea has many active ingredients, with caffeine being the most abundant. The amount of caffeine in a specific cup of green tea depends on the type of green tea, the length of time the tea steeps, and the size of the cup. Some studies have found that there is less caffeine in green tea than in coffee, but other studies have found the opposite. The differences in findings may be due to the different types of green tea and coffee that were studied.

In general, it takes longer to absorb and digest caffeine from green tea than from coffee, but the effects of caffeine last longer. This may explain why some studies have found less caffeine in green tea, but increased effects of the caffeine.

Although there are many claims that green tea can help with weight loss, most of these are not supported by good research. In fact, there is some evidence that theanine, one of the active substances in green tea, may promote relaxation without the side effect of sleepiness that most people experience from caffeine.

Green tea is often used to ease minor ailments such as headache, upset stomach, and nausea. It may also help to relieve symptoms of colds and flu. However, the evidence for these claims is not very strong. More research is needed to find out if green tea is truly effective for treating these conditions.

Green tea has been claimed to reduce the risk of many types of cancer, including cancers of the colon, esophagus, lungs, pancreas, and prostate. It has also been claimed to help prevent heart disease and improve bone strength.

Sources & references used in this article:

(−)-Epigallocatechin-3-gallate alleviates spatial memory impairment in APP/PS1 mice by restoring IRS-1 signaling defects in the hippocampus by N Jia, K Han, JJ Kong, XM Zhang, S Sha… – Molecular and cellular …, 2013 – Springer

Dietary tea polyphenols ameliorate metabolic syndrome and memory impairment via circadian clock related mechanisms by G Qi, Y Mi, Z Liu, R Fan, Q Qiao, Y Sun, B Ren… – Journal of Functional …, 2017 – Elsevier

Role of green tea catechins in prevention of age‐related cognitive decline: pharmacological targets and clinical perspective by MH Farzaei, R Bahramsoltani… – Journal of cellular …, 2019 – Wiley Online Library

EGCG ameliorates high‐fat–and high‐fructose‐induced cognitive defects by regulating the IRS/AKT and ERK/CREB/BDNF signaling pathways in the CNS by Y Mi, G Qi, R Fan, Q Qiao, Y Sun, Y Gao… – The FASEB …, 2017 – Wiley Online Library

Adipose tissue tumor necrosis factor and interleukin-6 expression in human obesity and insulin resistance by PA Kern, S Ranganathan, C Li… – American Journal …, 2001 –

Tissue-specific control of mitochondrial respiration in obesity-related insulin resistance and diabetes by MH Holmström, E Iglesias-Gutierrez… – American Journal …, 2012 –

Brain insulin resistance and deficiency as therapeutic targets in Alzheimer’s disease by SM de la Monte – Current Alzheimer Research, 2012 –