Green Tea Extract and L-Theanine Improve Mental Function

Background:

L-theanine, an amino acid found in tea leaves, helps reduce stress, promote relaxation and improve the quality of sleep. L-theanine is found in tea leaves in low concentrations (less than 2 percent), which means that effective dosage levels (of 100 – 200mg/day) cannot be delivered from drinking tea. Recently, animal studies and human studies have shown that a high dose of L-theanine (100 mg) combined with caffeine about at the level of a single cup of tea (40 mg), can help to improve attention, memory, and cognition.

L-Theanine Actions

There is no question that caffeine increases alertness, but this effect comes at a price. L-Theanine appears to counteract some of the stimulatory effects of caffeine while exerting benefits of its own. Some of the effects noted for L-theanine include:

Increasing brain serotonin, dopamine, and GABA levels.
Binding to various brain receptor sites.
Improving learning and memory in animal studies.
Positive results in double-blind studies showing it:
- Reducing feelings of stress.
- Improves the quality of sleep.
- Diminishes the symptoms of the premenstrual syndrome
- Increasing the production of alpha brain waves

L-theanine is a very is a popular ingredient in function foods and beverages as well as dietary supplements designed to produce mental and physical relaxation, without inducing drowsiness.

New Data

In a study of 91 subjects with mild cognitive impairment (MCI), subjects were given either the green tea-theanine combination or a placebo. Neuropsychological tests (Rey-Kim memory test and Stroop color-word test) and electroencephalography (EEG) were conducted to evaluate the effect of green tea-theanine on memory and attention. The results demonstrated that the green tea-theanine product led to improvements in memory and attention. The EEG tracings indicated an increase in brain theta waves, an indicator of cognitive alertness.

Reference:

Park SK, Jung IC, Lee WK, et al. A combination of green tea extract and l-theanine improves memory and attention in subjects with mild cognitive impairment: a double-blind placebo-controlled study. J Med Food. 2011 Apr;14(4):334-43.

Welcome

On the Dr Oz show

On the show I discussed the failure of conventional medicine to address the underlying issues in many health conditions offering little more than drugs as biochemical “band aids.”

September is Prostate Cancer Awareness Month

Prostate cancer (PC) is the most diagnosed form of cancer in American men. Each year there are roughly 200,000 men that are diagnosed with PC and over 30,000 will die from it. In many respects, PC is the mirror of breast cancer in women. It is a hormone-sensitive cancer that will affect at least one out of every six men now living in the United States.

Most PCs are slow growing; however, there are cases of aggressive PCs. The cancer cells may metastasize (spread) from the prostate to other parts of the body, particularly the bones and lymph nodes. Next to lung cancer, in men PC is the second leading cause of death due to cancer.

The big push conventional medical circles will make this month is encouraging men over the age of 50 years to see a physician for two tests:

A digital rectal exam–the doctor inserts a lubricated, gloved finger into the rectum and feels the prostate through the rectal wall to check for hard or lumpy areas.
A blood test for prostate-specific antigen (PSA)- which will usually be elevated in men with PC. A normal PSA ranges from 0 to 4 nanograms per milliliter (ng/ml). A PSA level of 4 to 10 ng/ml is considered slightly elevated; levels between 10 and 20 ng/ml are considered moderately elevated; and anything above that is considered highly elevated. The higher the PSA level, the more likely it is that cancer is present. However, approximately 35% of men with diagnosed PC will have a “normal” PSA of less than 4. The level of prostate-specific antigen (PSA) in the blood tends to rise with PC, but minor elevations may be due to less serious conditions like prostatitis (inflammation of the prostate) and benign prostatic hyperplasia (BPH) (enlargement of the prostate).

Weekly Health Tip

Mind Your Ps and Qs

PQQ may be the perfect answer to preventing or reversing age-related mental decline.

kiwiPQQ (short for pyrroloquinoline quinone) is a vitamin-like compound found in plant foods that shows a wide range of benefits for brain function and energy production. Learn more about PQQ with the following Q&A.
What Exactly Does PQQ Do?

PQQ is an extremely potent antioxidant that is able to carry out the role of an antioxidant in the body more than 20,000 times—which is a rare thing. For example, other antioxidants, such as vitamin C, are only able to accomplish this “cycling” process about four times.
Are There Any Food Sources of PQQ?

PQQ has been found in all plant foods analyzed to date. Particularly PPQ-rich foods include parsley, green peppers, kiwi, papaya, and tofu. These foods contain 2–3 mcg of PQQ per 100 grams. Green tea provides about the same amount per 4-oz. serving. While these amounts appear to be sufficient in helping our cells carry out their basic functions, research indicates that boosting PQQ through supplementation can produce some amazing effects.

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