Nutrition Facts with Dr. Greger
from: Nutrition Facts with Dr. Greger
Michael Greger, M.D. FACLM
PUBLISHED: MAR 26, 2026INDEXED: APR 30, 2026, 9:57 AM

The Health Benefits of Black and Green Teas

Quotes & Clips

7 clips
Nutrition Facts with Dr. Greger
Mar 26

Tea uniquely produces calm alpha brain waves like meditation

β€œThe two waking states are alpha and beta. We have alpha brain waves when we're relaxed, aware, attentive, like when we close our eyes and meditate. And beta waves are more when we're stimulated with increased alertness and the hustle and bustle state where most of us live our lives. How can we get more in that alpha state, that wakeful relaxation, fully alert and focused, but calm? Well, if we relax in a nice peaceful place, after about ninety minutes we can start to see some significant alpha activity.”

β€” Michael Greger - founder of NutritionFacts.org
Nutrition Facts with Dr. Greger
Mar 26

Green tea mouthwash cuts bad breath compounds by 40%

β€œThis is the study I've been looking for, a randomized, double blind, placebo controlled trial in which people rinse their mouth twice a day for a month with a green tea mouthwash or a similar looking tasting placebo mouthwash. And at the end of the month, the stinky bad breath compounds were reduced nearly 40% in the green tea group versus closer to only 10% in the placebo group.”

β€” Michael Greger - founder of NutritionFacts.org
Nutrition Facts with Dr. Greger
Mar 26

Green tea ointment clears genital warts in over half of cases

β€œExternal genital warts caused by human wart viruses are one of the most common and fastest spreading venereal diseases worldwide. Patients with external genital warts present with one or several cauliflower like growths on the genitals and or anal regions, considerably impairing people's emotional and sexual well-being. But rub some green tea ointment on, and you can achieve complete clearance of all warts in more than fifty percent of cases.”

β€” Michael Greger - founder of NutritionFacts.org
Nutrition Facts with Dr. Greger
Mar 26

Gargling green tea slashes flu risk 7-fold in nursing homes

β€œWhile a similar effect was not found in high school students, gargling with green tea may drop the risk of influenza infection seven or eightfold compared to gargling with water in elderly nursing home residents where flu can get really serious.”

β€” Michael Greger - founder of NutritionFacts.org
Nutrition Facts with Dr. Greger
Mar 26

Six cups of tea daily boost interferon 15-fold in a week

β€œSubjects who drink six cups of tea per day had up to a 15 fold increase in infection fighting interferon production in as little as one week. But why? There's actually a molecular pattern shared by cancer cells and pathogens and with edible plant products such as tea, apples, mushrooms, and wine.”

β€” Michael Greger - founder of NutritionFacts.org
Nutrition Facts with Dr. Greger
Mar 26

Three extra cups of tea daily linked to 24% lower death risk

β€œTea consumption is associated with living a longer life, thanks to links to less cardiac death, heart disease, stroke, and type two diabetes, and not just by a little. A three cup a day increase in tea consumption per day is associated with a twenty four percent decreased risk of premature death from all causes put together, the equivalent of adding about two years onto your lifespan.”

β€” Michael Greger - founder of NutritionFacts.org
Nutrition Facts with Dr. Greger
Mar 26

Green tea matches chlorhexidine for plaque without nasty side effects

β€œGreen tea appears to work as well as chlorhexidine for reducing plaque, and chlorhexidine is like the gold standard. Green tea is safer too. Chlorhexidine has has so many side effects that you're not supposed to use it for more than a short time period. Side effects like discoloration of the teeth, increased formation of tartar, an impairment of taste sensation, and occasionally damage to the inner lining of your mouth, whereas if anything, drinking green tea appears to have good side effects.”

β€” Michael Greger - founder of NutritionFacts.org

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