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Black Tea Shows Blood Sugar Benefits

Drinking black tea may be beneficial for people with diabetes, as it appears to stimulate an insulin response and reduce blood sugar levels, according to researchers from King‘s College London and the University of Central Lancashire.

Sixteen participants drank glucose in either water, water plus a small amount of caffeine, or water plus instant black tea.

After two hours, plasma glucose concentrations were significantly reduced in those who consumed 1 gram of tea, compared to the plain water and caffeine drinks. Drinking black tea also increased insulin levels compared with the other drinks, after 90 minutes.

Tea’s protective benefits have been linked to polyphenols, including:

  • Epigallocatechin gallate (EGCG)

  • Epigallocatechin

  • Epicatechin gallate

  • Epicatechin
These compounds may offer blood sugar benefits by stimulating B-cells -- pancreatic cells responsible for insulin production -- to produce insulin in your body, according to researchers.

Black tea makes up about 78 percent of the global tea market.

Sources:



Dr. Mercola''s Comments Dr. Mercola's Comments:

Americans drink about 2.25 billion gallons of tea each year -- that’s about 132 cups of tea per person per year. While this sounds like a lot, you may actually need five to 10 cups of most green or black teas a day to reap many of their protective benefits.

Still, one of the active ingredients in tea, epigallo-catechin gallate (EGCG), really does show potential to fight a wide range of diseases, including:
Plus, a growing body of research suggests that the wonderful polyphenols in tea can lower your cholesterol, triglyceride levels and blood pressure, and even help to protect your bones.

I still believe that water should be your beverage of choice, and should make up the majority of your fluid intake, but adding tea to your day is a perfectly sensible choice for an additional beverage.

Do Your Homework on Your Tea Choices

Out of the seemingly endless varieties of tea out there, there are only a small handful that I would recommend drinking.

The first thing to watch out for is fluoride. Many conventional brands contain unsafe amounts of this health-harming chemical that has been linked to osteosarcoma, the most common kind of bone cancer. If you drink tea that is high in fluoride, your risks will outweigh your benefits, so please find a brand that will vouch for its low fluoride content.

You also need to choose tea that is grown in as nutrient-rich and clean a soil as possible. The majority of the world's green teas consumed today come from China, Pakistan, and India, which may have potentially toxic soil conditions.

Also be aware that high-quality green tea should, in fact, look green. If your “green” tea looks brown, it is not a high-quality tea. My current favorite green tea is called Matcha green tea, as it is the highest quality premium green tea and typically is reserved for royal tea ceremonies in Japan.

The other option for those of you looking to get the health benefits of tea without worrying about fluoride or contaminants is to try a high-quality tea extract that is fluoride-free.

Of course, if you decide to drink tea, make sure that you are simply drinking it “straight.” Avoid adding sugar, milk or other unhealthy additions, and certainly stay away from tea energy drinks, which are nothing more than chemical cocktails.


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Comment on This Article Community Comments (45)
 
 
Posted On Oct 25, 2007
Remember that improved insulin sensitivity is the key to longevity of life and health, not just being able to dump more insulin into the blood stream to control blood sugar.  Increasing insulin levels, while it may lower blood sugar, the higher insulin levels will still shorten your life.  The tea may be a short term alternative to help in control of blood sugar while one improves their insulin sensitivity through improved diet and exercise.

 
foxtroter_203
Savvy User Savvy User, Joined On 9/2006
foxtroter_203  
Replied

samurai
Savvy User Savvy User Joined On 4/2007
samurai  
 
Posted On Oct 25, 2007
Well said, Foxtroter.  Especially exercise.


Russ Bianchi
Savvy User Savvy User Joined On 9/2006
Russ Bianchi  
 
Posted On Oct 25, 2007
METABOLICALLY TYPED DIET & REGULAR LOW IMPACT EXERCISE (Cubed)...


BeyondOrganic
Savvy User Savvy User Joined On 6/2006
BeyondOrganic  
 
Posted On Oct 28, 2007
When I was pregnant and ate something that I shouldn't have....  I would get on my elliptical and that would take my Blood Sugar right down!  It's amazing how exercise does that! 

 
 
 
Posted On Oct 25, 2007
Was this sponsored by the British Tea Council ?
...Well, you have to come up with something when the ever increasing popularity of coffee here in the UK is rapidly wiping out your bottom line!

 
david
Savvy User Savvy User, Joined On 8/2006
david  
 
 
 
Posted On Oct 25, 2007
I have become skeptical of all claims that something will lower blood glucose levels or improve insulin receptiveness. I have tried (and in some cases am still taking) Cinnamon verum, Chromium picolinate, Biotin, Gymnema sylvestre, and of course, tea, both black and green. Recently my doc and I agreed to try Metformin as well. I check my BG twice a day, and I record what I eat and how active I have been.

So far, the only effects on BG have been from diet and exercise. Period. Nothing else seems to make the slightest difference.

 
Islander
Moderator User Moderator User, Joined On 3/2007
Islander  
Replied

foxtroter_203
Savvy User Savvy User Joined On 9/2006
foxtroter_203  
 
Posted On Oct 25, 2007
I agree that diet and exercise make the big difference in BG levels. All the other supplements have a more minor benefit at best---except for the companies selling them.


samurai
Savvy User Savvy User Joined On 4/2007
samurai  
 
Posted On Oct 25, 2007
Islander,
Have you checked your blood glucose levels after a workout? 
Let's say for instance, you wake up, and your fasting BG levels are 100.
On an empty stomach, you decide to take a jog for 20-30 minutes (using the PACE concept, of course).  After the jog, you take your blood glucose level.  Does it drop below the 100?
OR, does it mean that after a sweet drink like a Coca-Cola you have a reading that is not as high as it would be absent of regular exercise?
Please advise.


samurai
Savvy User Savvy User Joined On 4/2007
samurai  
 
Posted On Nov 17, 2007

ISLANDER,

May I ask why your BG is so high if you do not use any sweets?

Thanks so much for the test #'s that is AMAZING.  If your fasting BG is 146 absent of sugars, what the heck would your system do with something like a port wine??  I find this topic extremely fascinating, and I do not have diabetes.  My fasting BG is 87.  



holisticfuture
Novice User Novice User Joined On 11/2007
holisticfuture  
 
Posted On Nov 20, 2007

There is a possibility of iron overload if you've tried everything else to increase insulin sensitivity. According to Dr. Richard Bernstein, in his book, "Dr. Bernstein's Diabetes Solution," (pp. 247-248) he states too much iron in your body will make you insulin resistant. If in the past you've used cast-iron skillets or taken regular supplements with added iron, then you may be at risk. Iron is not easily depleted from the body and builds up over time, and contributes to many health conditions. You may need to get your serum ferritin level checked out and be asked to donate blood or undergo therapeutic phlebotomies. Dr. Bernstein recommends donating blood every two months to maintain optimal insulin sensitivity.


 
 
 
Posted On Nov 16, 2007

Does anyone know why green tea would cause nausea?  I used to think it was because the green teas I occasionally tried weren't organic/good quality. But after reading an article by Dr. Mercola last month, I bought a really high quality, organic macha from Japan. It made me severely nauseated for two hours after I drank it.  I mentioned this to a friend, and she said that she gets this same reaction from green tea. Is this common? I have no trouble drinking black teas.


 
Anna J
Novice User Novice User, Joined On 6/2006
Anna J  
Replied

Dr. Mercola
Master User Master User Joined On 12/1997
Dr. Mercola  
 
Posted On Nov 17, 2007

This is called a "clue".  You do not have to know why it is causing it only that your body is screaming at you to stop it immediately.  Everyone is different, there are nearly limitless permutations of genetic combinations that make it impossible to predict these types of reactions. The beauty of natural products is they typically give you mild and NON fatal hints to stop. Unlike many drugs which can kill you.

So, bottom line stop the green tea ASAP, and if you purchased it from us return it for a full refund.



DRC
Novice User Novice User Joined On 6/2006
DRC  
 
Posted On Nov 17, 2007

Anna, when I first tried green tea many years ago, I found that hot tea made me very nauseas, but I handled it cold vey well. So for years I drank 2-3 iced green teas, usually Celestial Seasonings, sweetened with stevia. In 2005 I started drinking hot Chai tea as well, which i tolerated well. All of a sudden any tea at all made me extremely nauseas, which has continued to this day. Needless to say, I no longer drink tea.

Anyway I haved searched the web from time to time, looking for anyone who has had the same reaction, and a clue as to why. I have come up empty. Its just nice to know i'm not the only one.



c.sirtoff
Novice User Novice User Joined On 6/2006
c.sirtoff  
 
Posted On Nov 18, 2007

I too have the same problem, if any one knows I am interested also.

Cahrla



annapurna
Novice User Novice User Joined On 4/2007
annapurna  
 
Posted On Nov 19, 2007

Occasionally green tea will make me nauseated.  I found that a few things will eliminate this 1) don't drink it on an empty stomach and 2) Don't steep the tea for so long (try about 1 minute).

Green and White teas have less of a steeping time than regular black tea and are intended to have more delicate flavors as the leaves have not been fermented.  Green tea becomes bitter when steeped too long!



Clairdelunecho
Novice User Novice User Joined On 3/2008
Clairdelunecho  
 
Posted On Mar 13, 2008

I recently bought some matcha green tea, and had been drinking a couple of cups a day for two days when on day 3 I made a 32-ounce bottle of iced tea with probably half a teaspoon of tea in it. About 20 minutes later, I became nauseous and it came up. I've been trying to find out why it could do this but have no idea yet, but in this instance I did have the tea on an almost-empty stomach, and I'm guessing that's a factor. I'll be trying the tea again in much, much smaller amounts, maybe one cup a day on a full stomach, max. I just read a study about how too much green tea (such as in those mega-dose supplements) can cause liver toxicity in animals, so I'll be keeping my intake to below 500 grams a day - assuming I can tolerate it at all.


 
 
 
Posted On Oct 25, 2007
Okay, black tea might might it easier for insulin to get into your blood stream.  Does that mean it is easier for it to get into your cells.  Different question and different effects on your body.  This does sound like and advertisement for black tea.

Mary

 
mmc88121
Moderator User Moderator User, Joined On 11/2006
mmc88121  
 
 
 
 
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