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Is Caffeinated Tea Really Dehydrating?

Phytonutrients exclusive to the tea plant appear so powerful that they can reverse disease even when just applied to the skin. Now officially incorporated into the Centers for Disease Control STD Treatment Guidelines, the topical application of green tea extracts on external genital warts results in an astounding 100% clearance in more than half the patients tested (see my 2-min. video Treating Genital Warts With Green Tea).

Green tea may even stop skin cancer. In Treating Gorlin Syndrome With Green Tea, I describe a remarkable case report of a woman with basal cell nevus syndrome, a rare genetic condition in which one’s body becomes covered in skin cancers. Her cancer was apparently reversed with topical green tea body wraps. This builds on research into the dietary reversal of other cancers (see Cancer Reversal Through Diet?).

These examples are a testament to the Power of Plants. It’s in line with research on cinnamon (The Safer Cinnamon), saffron (Saffron for the Treatment of Alzheimer’s), watermelon (Watermelon as Treatment for Erectile Dysfunction), flaxseeds (Just the Flax, Ma’am), and Indian gooseberries (Amla Versus Diabetes). Since there are few or no downsides to plant food remedies–if anything, lots of positive side effects!–I rarely hesitate to prescribe such natural products in my own medical practice.

Which type of tea is best to consume internally? The same leaves of the same plant are used to make white, green, oolong, and black tea. The primary difference is how they are processed; white being the least processed and black being the most. In Green Tea vs. White, I showed that green tea has the most antioxidant power–unless you added lemon, in which case white tea pulls ahead. New research has taken this a step further and tested their respective abilities to prevent DNA damage. In my 2-min. video Antimutagenic Activity of Green vs. White Tea, green is pitted against white in a head-to-head test against a potent carcinogen found in grilled chicken. White won, and the longer it was brewed, the more protective it became.

The longer-the-better brewing time didn’t surprise me, but this did: Cold Steeping Green Tea. Another way to maximize the phytonutrient absorption from tea is to eat it; see Is Matcha Good for You? and A Better Breakfast. One can overdo it though (see Overdosing on Tea). Other ways to protect one’s DNA include eating broccoliavoiding bacon, not overdoing stevia, as well as eating a plant-based diet in general (see Repairing DNA Damage and Research Into Reversing Aging).

Isn’t caffeinated tea dehydrating though? Comparing up to 6 cups of caffeinated black tea a day to water, researchers studied the common assertion that tea acts as a diuretic and is not as hydrating as plain water. Find out the results in my video pick shown above.

The nutrition without calories concept refers, not surprisingly, to my video Nutrition Without Calories. For more on caffeine myths, see What About the Caffeine? For the antioxidant comparison of black tea to other teas, see Better Than Green Tea? The “less healthy beverages” line is likely an allusion to soda, about which I have a dozen videos including Food Industry “Funding Effect”Mercury in Corn Syrup?Diet & Hyperactivity, and Is Sodium Benzoate Harmful?

In health,
Michael Greger, M.D.

Image credit: ienjoysushi / flickr


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Dr. Michael Greger

A founding member of the American College of Lifestyle Medicine, Michael Greger, M.D., is a physician, author, and internationally recognized speaker on nutrition, food safety, and public health issues. Currently Dr. Greger serves as the Director of Public Health and Animal Agriculture at The Humane Society of the United States. Hundreds of his nutrition videos are freely available at


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8:24PM PDT on Oct 23, 2012

Thank's for sharing !

4:44PM PDT on Oct 22, 2012


12:47PM PDT on Aug 17, 2012

Wow! I have been drinking Chai lately, and am so happy to hear this. I started drinking green tea as well! I am happy to hear of the great benefits! Thank you!

11:04AM PDT on Aug 7, 2012


8:56PM PDT on Jul 22, 2012

Thanks Dr. Greger for the information and the video.

12:26PM PDT on Jul 22, 2012


6:27AM PDT on Jul 22, 2012

A good reason [excuse] to each green tea mochi balls.

2:22AM PDT on Jul 22, 2012

Thank you, Dr Greger, that was good information. Green Tea is far more potent than what we were told.

7:52PM PDT on Jul 21, 2012

I think a good quality organic tea is better with regards to lower caffeine, just experiment with brands and see what works for you.

7:45PM PDT on Jul 21, 2012

Thanks. I drink several cups of tea per day. I start my morning with black tea, them switch to green tea or occasionally white. It's reassuring to know that this addiction is healthy!

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