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Dietary Brain Wave Alteration

A neurological basis for humanity’s love affair with Camellia sinensis?

November 12, 2010 |
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Dietary Brain Wave Alteration, 4.8 out of 5 based on 5 ratings

Sources Cited

A. C. Nobre, A. Rao, and G. N. Owen. L-theanine, a natural constituent in tea, and its effect on mental state. Asia Pac J Clin Nutr, 17(suppl - 1):167-168, 2008.

Cancer Epidemiol Biomarkers Prev. 2008 Mar;17(3):712-6.Coffee, tea, colas, and risk of epithelial ovarian cancer. Song YJ, Kristal AR, Wicklund KG, Cushing-Haugen KL, Rossing MA.

S. E. McCann, M. Yeh, K. Rodabaugh, and K. B. Moysich. Higher regular coffee and tea consumption is associated with reduced endometrial cancer risk. Int. J. Cancer, 124(7):1650-1653, 2009.

M. B. de Santana, M. G. Mandarino, J. R. Cardoso, I. Dichi, J. B. Dichi, A. E. I. Camargo, B. A. Fabris, R. J. Rodrigues, E. C. S. Fatel, S. L. Nixdorf, A. N. C. Sim~ao, R. Cecchini, and D. S. Barbosa. Association between soy and green tea (camellia sinensis) diminishes hypercholesterolemia and increases total plasma antioxidant potential in dyslipidemic subjects. Nutrition, 24(6):562-568, 2008

K. Maruyama, H. Iso, S. Sasaki, and Y. Fukino. The association between concentrations of green tea and blood glucose levels. J Clin Biochem Nutr, 44(1):41-45, 2009.

K. C. Maki, M. S. Reeves, M. Farmer, K. Yasunaga, N. Matsuo, Y. Katsuragi, M. Komikado, I. Tokimitsu, D. Wilder, F. Jones, et al. Green tea catechin consumption enhances exercise-induced abdominal fat loss in overweight and obese adults. Journal of Nutrition, 139(2):264, 2009.

S. I. Lee, H. J. Kim, and Y. C. Boo. Effect of green tea and (-)-epigallocatechin gallate on ethanol-induced toxicity in hepg2 cells. Phytother Res, 22(5):669-674, 2008.

T. P. Ng, L. Feng, M. Niti, E. H. Kua, and K. B. Yap. Tea consumption and cognitive impairment and decline in older chinese adults. American Journal of Clinical Nutrition, 88(1):224, 2008.

Acknowledgements

Transcript

Tea, black tea/green tea/white tea, is made from the tea plant. That’s different from herbal tea, which is defined as pouring hot water over any plant in the world other than the tea plant. There are 287,655 different types of plants on the planet; why is this one plant, the most popular beverage in the world? It’s not the caffeine—the coffee plant has more caffeine, but more people drink tea than coffee. It’s probably not the taste—most people would probably prefer peppermint, or some of the fruity berry teas as better tasting. I mean it’s a pretty enough plant, but why do we drink literally billions of cups a day—of this one?
Well, I think we just figured it out. It turns out there’s something in this plant that’s basically found in only two places in nature—here, and in a weird blueish mushroom called the bay boleet, which has these little holes instead of gills. Scientists figured this one might taste better with crumpets, and so they called the unique substance theanine. What does this stuff do that it has billions of people hooked on it? We weren’t quite sure, until last year.
When you hook up people to an EEG to measure their brain wave activity, you find that human beings essentially have four mental states—two while sleeping and two while awake. Delta waves, where your whole brain is basically electrically pulsing very slowly at about a wave a second, are only seen in deep sleep. Then there’s theta wave sleep, when you’re dreaming, at about 5 cycles per second.
The two waking states are alpha and beta. Alpha is relaxed, aware, attentive, like when we close our eyes and meditate; and beta is more the stimulated, hustle-and-bustle state where most of us live our lives.
Alpha is where we want to be, fully alert and focused, but calm. How do we get there? Well if you relax in a nice peaceful place, after about 90 minutes you can start to see some significant alpha activity, which is this yellow and red. Now practicing meditators, like Buddhist monks, can achieve this state earlier, and maintain it even with their eyes open.
So you can meditate every day for a few years, or just drink some tea. This is the amount of theanine that enters your brain after you drink about two cups of tea. Look closely, compare, and see if you detect a difference. That, is why people drink tea from the tea plant.
But are their side-effects to so dramatically altering our brain on a daily basis? Well if seen my previous years’ lectures, you know that the side effects of daily tea consumption include things like less breast cancer risk, and living a significantly longer life.
Here are the new side-effects we just learned about in the last 12 months: Drinking tea from the tea plant halves your risk of getting ovarian cancer. Halves your risk of getting endometrial cancer. Can lower our cholesterol, our blood sugars, and our weight. Protect our liver. And protect our brain. Drink green tea every day.

To see any graphs, charts, graphics, images, and quotes to which Dr. Greger may be referring watch the above video. This is just an approximation of the audio contributed by veganmontreal.

To help out on the site please email volunteer@nutritionfacts.org

Dr. Michael Greger

Doctor's Note

Please feel free to post any ask-the-doctor type questions here in the comments section and I’d be happy to try to answer them. And check out theother videos on tea. Also, there are 1,449 other subjects covered in the rest of my videos--please feel free to explore them as well!

Also, for more context be sure to check out my associated blog posts: Breast Cancer and DietIs Caffeinated Tea Really Dehydrating?Stool Size and Breast Cancer RiskSoymilk: shake it up!, and Increasing Muscle Strength with Fenugreek

  • http://nutritionfacts.org/members/mgreger/ Michael Greger M.D.

    Please feel free to post any ask-the-doctor type questions here in the comments section and I’d be happy to try to answer them. And check out the other videos on tea. Also, there are 1,449 other subjects covered in the rest of my videos–please feel free to explore them as well!

  • http://nutritionfacts.org/members/myjolina/ Laura Scalia

    Hi Doc
    Two questions: with fibromyalgia, I am constantly waking up in the night – is there a way to know whether I have reached the delta sleep?
    Also, I have always read that meditation is a deeper sleep than what sleep is – so, are you saying that drinking tea will actually restore the brain patterns that loss sleep caused and that there is no benefit to meditation?

  • http://nutritionfacts.org/members/wickedchicken/ wickedchicken

    Wow. I meditate and have drank a lot of tea in my time…. no comparison, meditation gets my high score.

  • Michael Greger M.D.

    Also be sure to check out my associated blog post Breast Cancer and Diet!

  • Phil

    Have the Monks been briefed? =D

  • Gabrielle

    Is this the same tea plant (and effect) in black tea? or is it just green tea?

  • http://www.facebook.com/profile.php?id=666366687 Stephen Lucker Kelly

    Is Hibiscus Tea better than Green Tea? Or do both have different effects?

  • Johnny T.

    What about decaf green tea? Just as effective as regular?

  • Eva

    Wouldn’t the caffeine counteract the relaxing effects of the theanine? I’m very sensitive to caffeine; it makes me anxious. How could I get the benefits of green tea without the effects of caffeine? Is that at all possible?

    • Toxins

      If you are sensitive to caffeine, you can always find decaffeinated green tea.