Category Archives: tea

Tea lowers brain cancer risk

In an amazing study, both tea and coffee have been associated with a sharply lowered risk of glioma, a cancer that originates in the brain and spinal column. The association wasn’t small — just 0.4 cups of coffee a day was associated with a 34% reduction in gliomas.

The authors presented no mechanism for what role coffee and tea may play in the brain cancer reduction so at the moment it is unclear how the beverages work their magic or even if lifestyle differences between coffee/tea drinkers and non-drinkers may be the reason. However, the association is strong enough that researchers from several prestigious institutions were full of praise for the study.

Dr. John S. Yu from the Brain Tumor Center of Excellence at Cedars-Sinai Medical Center in Los Angeles was quoted in USA Today as saying, “If we had a drug for any disease that could demonstrate a risk reduction of 34%, that would be considered a great drug. That degree of risk reduction is very strong.”

The study was also very large — 410,000 men and women were followed for 8.5 years, leading to more certainty about the study’s conclusions.

Very fascinating stuff… I wonder if one day these beverages will get a special compartment in the food pyramid taught to school children?

The study was published in the American Journal of Clinical Nutrition which has generously granted access to the full article via it’s website at the following link: Coffee and tea intake and risk of brain tumors in the European Prospective Investigation into Cancer and Nutrition (EPIC) cohort study.

Sources:

http://www.usatoday.com/yourlife/food/diet-nutrition/2010-11-19-coffee-tea-brain_N.htm?csp=34news

Assam Tea

Assam tea is a perfect variety to make home-made iced milk-teas. The taste is strong so it blends well with milk and has a vaguely choclatey taste to it. This is usually my tea of choice from Teavana, so I was very surprised when I visited my local Teavana shop to see that the Assam tea is being discontinued! In fact, they had great big tins of it for sale at 75% off. I used the opportunity to snap up the store’s supply, so I’m good for at least a year… But what will I do when my stash runs out?

It was then that I read that Assam tea has set new price records at recent tea plantation auctions. The Telegraph from Calcutta reports that recent auction prices for Assam tea have increased to an all-time record early on in the auction season. Apparently this past year has been just perfect for the Assam variety and the resulting tea is very high quality.

So it sounds like my fears were unfounded — a quick Internet search has proven to me that there’s plenty of places to purchase Assam loose leaf tea and furthermore, the quality of the tea has never been better.

And finally, here’s my recipe for a perfect iced Assam milk-tea:

  • 2 heaping tsp Assam black loose-leaf tea
  • 3/4 cup boiling water
  • 4 tsp sugar (or to taste)
  • 8 ice cubes
  • 1 cup milk

Add the boiling water to the loose leaf tea and let it steep at least 3 minutes (over-steeping doesn’t affect the taste). Strain the tea leaves. Stir in the sugar. Plop in the 8 ice cubes and pour the milk on top.

Enjoy!

GT’s Enlightened Organic Raw Kombucha

In the fru-fru section of your local grocery store a new product lurks. Right next to the dense wall of Odwallas and Naked Fruit Juices is “GT’s Enlightened Organice Raw Kombucha”. This tea-colored bottle piqued my interest — raw tea? Curious… I brought it home and took a sip. Blech! It tastes like beer! No tea taste at all!!! Upon navigating over to the wikipeda page for kombucha, I see that beer is exactly what it is — well, sort of. It’s a “tea-based beverage” in which yeast and bacteria have been allowed to ferment. The resulting concoction even has a very low dose of alcohol in it. The raw part of the title is because the yeast and bacteria are living and there are cultures floating around inside the beverage. A close-up photo shows some of the delightful colonies floating at the top of my kombucha:

Apparently during the Qin Dynasty in China this stuff was known as the tea of the gods and revered for giving drinkers magical powers to live forever. Today, the beverage is pimped as a health drink because of the resulting brew of beneficial bacteria and the compounds they produce during fermentation: Acetic acid, Butyric acid, B-vitamins, Gluconic acid, Lactic acid, Malic acid, Oxalic acid, Usnic acid and alcohol.

My experience of drinking this unexpectedly alcholoic tea beverage was similar to the free bag of Lapsang Souchong I recently received from Twinings. Perhaps I’ll get another bottle of this stuff and give it a try again in the future. But for now, I think I can guess why I’ve never seen this in the grocery store until now!

Author’s update: the stuff was gone from my local Safeways after about 3 weeks.

Free tea from Twinings!

A couple of months ago, Twining was advertising free tea samples of their new tea mixes. It was simple — I just went to their website, chose three flavors and they mailed them to me about a month later. Here’s what I chose:

In case the text in the picture is too small: Prince of Wales Tea, Lapsang Souchong Tea and English Afternoon Tea.

In the old days (1700s-1800s) “Souchong tea” referred to the older tea leaves closer to the trunk of the tea bush (Camellia sinensis). “Orange Pekoe” referred to the newer tea leaves near the tip of the branches which were thought to give better flavor. I had never seen Souchong tea explicitly labeled and offered as such so I figured now was my opportunity to see what a bag of supposedly lower quality tea leaves tasted like! Here’s my photo of the brew:

Then I took a taste…. Ok, to say that I felt like I was drinking the tea version of cigarette ash would be about right! Hack, hack, cough, cough… Unexpectedly smoky tasting. Looking at the back of the packaging, the text reads, “The unique flavour of Lapsang Souchong is produced by laying the leaves out on bamboo trays and allowing smoke from pinewood to permeate through them. Twinings Lapsang Souchong is an adventurous tea with a unique smoked flavour and a dark rich colour.”

Adventurous indeed! I guess it’s safe to say I’m not into smoked tea. I’m guessing this tea is marketed more towards people who smoke other forms of leaves (such as tobacco, of course). In fact, when I googled it I see that Lapsang Souchong is an expensive tea from the Wuyi region in Fujian, China. It seems to be prized as a “man’s tea”.

After the Lapsang Souchong, the remaining two teas were like drinking liquid ambrosia! They tasted so much better. The English Afternoon Tea was a lighter-bodied, traditional-tasting tea with a tiny hint of fruitiness. By contrast, the Prince of Wales tea had a slightly fruitier taste and a lesser traditional tea taste. But the difference seemed slight to me — I enjoyed both of them.

Coffee and tea reduce exposure to mercury

A study published in the scientific journal Environmental Research recently claimed that by consuming tea while eating fish reduced the mercury concentration of the fish a whopping 40%-60%. The study further showed that cooking the fish (either boiling or frying) also reduced the mercury concentration by 40%-60%. So together, the leftover mercury contamination was negligible.

While I found this story very encouraging, there was no explanation for where the mercury is going during the cooking or how tea/coffee is reducing the bio-availability of the mercury. I hope other scientists are able to duplicate the study and elucidate the mechanism. This could potentially come back to benefit live fish in the ocean whose health are doubtlessly suffering due to the water mercury levels!

I’m very amazed by the almost magical properties that tea and coffee seem to possess!

Source:
Ousséni Ouédraogo, Marc Amyot, Effects of various cooking methods and food components on bioaccessibility of mercury from fish, Environmental Research, Volume 111, Issue 8, November 2011, Pages 1064-1069

Naturally reduce caffeine in tea?

 

Contrary to popular belief, all teas contain caffeine — including green tea and white tea. The only types of tea with no caffeine are the herbal teas, which are not derived from true tea plant leaves (Camellia sinensis).

Many people relish drinking tea throughout the day. Others who are caffeine sensitive switch to decaffeinated teas starting in the afternoon. You can buy decaffeinated tea, but I have read from many sources that much of the caffeine diffuses from the tea leaves after about 45 seconds of steeping. Throwing this initial brew away and re-steeping the tea with fresh, hot water supposedly leaves a very-low caffeine tea.

I have never seen actual numbers quantifying the caffeine reduction and wondered if this advice was really true. It seems that others have had the same question and a group of food scientists from Auburn University measured the caffeine levels in tea versus the amount of time spent steeping for several different types of tea.

Their results? Quite interesting…

They verified that  the caffeine levels of tea are reduced by pouring out the first brew, just not as much as you would expect. Their experiment showed that after 5 minutes, the caffeine content was reduced between 61% to 76%, depending on the type of tea. In general, bagged tea released its caffeine more quickly than loose leaf tea.

I wish they had measured the caffeine reduction per second so I could know for sure how much the caffeine is reduced for a 45-second steep (unfortunately the experimental method of measuring caffeine in foods requires expensive, specialized equipment).

However, the paper presents data for the caffeine dispersal in 5 minute intervals. Plus, we know that at time = 0 seconds, there is no caffeine dispersal. Therefore, I extrapolated the following curve and calculated the caffeine reduction at 45 seconds to be a mere 17%!

The red dots in the above plot show the data from the published study and the green dot is my extrapolated estimate. Using my data fit, I estimated a few more data points:

Diffusion Time Caffeine Reduction
15 secs 6%
20 secs 7%
30 secs 11%
45 secs 17%
60 secs 21%
90 secs 30%

In case you want to calculate the caffeine reduction yourself, here is the formula I calculated (where t is in minutes, so you would use t=0.75 to calculate the dispersal in 45 seconds):

100-100.214*Exp[-0.242611*t]

Considering that the caffeine reduction in 45 seconds is so low and that almost all the taste has certainly leached away by that point, the best bet is to just go with store-bought decaffeinated tea!

References:
Monique B. Hicks, Y-H.Peggy Hsieh , Leonard N. Bell, Tea preparation and its influence on methylxanthine concentration, Food Research International, Volume 29, Issues 3-4, April-May 1996, Pages 325-330

Tetley’s British Blend Premium Tea

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When I was growing up this used to be my Dad’s favorite tea (my Dad is from Scotland). My Mom would stock the cupboard with various fruit teas but my Dad refused to drink what he considered to be “hot fruit juice”. I guess as an adult I’m pretty much the same way, although my Dad has since developed a prediliction for iced mango tea.

Anyways, Tetley’s British Blend Tea is the same as their “regular” tea except there’s more tea per bag for a stronger cuppa. I never realized that the regular tea, the so-called “classic” tea is actually a weaker “Americanized” version of what the Brits drink. Or at least that’s what I’m inferring from the packaging.

I also vaguely recall what a big deal it was in 2000 when Tetley’s, then a British company, was bought out by Tata, an Indian tea conglomerate. They’ve done very well with the brand in the intervening years. Hopefully Cadbury will see the same success under Kraft’s reigns.

The tea itself is standard stuff. I usually use 2 bags of tea per cup so I got a surprise when I tried that with the British blend the first time. Whoa, this is strong stuff!!!! It’s what made me read the contents more closely.

In short, the tea is tasty and if you like your tea on the strong side then this brand is for you!

Original Red Rose Tea

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Orange Pekoe and Pekoe tea. Looking those terms up on Wikipedia, I see that they both basically mean generic medium-grade tea. Apparently Orange Pekoe does not refer to an orange flavoring, but rather to a sign of quality because the tea leaves came from the estate of a certain Orange-Nassau who was royalty from the Netherlands.

Red Rose Tea boxes also have miniature figurines inside. I once managed to collect an entire series and tried to sell the combined set on ebay for $1 — no takers!

It would be very sad if the figurines were the main selling point for the tea, but luckily that’s not the case. Red Rose Tea is tasty. It has a nicely oxidized taste and is stong enough to handle some milk. There’s also something slightly sweet about it too so I find I need less sugar.

So mid-grade generic tea is not half-bad! And certainly a better value than golden monkey tea or some other nonesense that you can spend many $$$ for.

Numi Rooibos Tea

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Rooibos tea exploded into the tea market about 3 years ago. At least that’s when I first tried it! Okay, so maybe it exploded before that, but I just didn’t notice.

My first impression three years ago was that as a tea the taste was very weak. It seems like when new products are introduced into the American market, a very watered-down version hits shops and restaurants first. And so it still is the case at Starbucks where I have enjoyed the beverage several times.

But then someone or other gets the notion that to really bring the full-bodied flavor out you have to make the tea much stronger. Such is the case now with Numi’s Rooibos tea. Very bold tasting with complex after-tastes, verging towards the bitter side.

Rooibos tea is actually not standard tea at all (which originates from the Camellia Sinensis plant). It is a product of the leaves of the African Red Bush. Apparently it is only grown in Western Capetown Provence in South Africa. The tea leaves are oxidized which produces the reddish hue. “Green” rooibos is also available which is tea from unoxidized leaves. According to Wikipedia, green rooibos contains more good “stuff” than oxidized rooibos.

It would interest me greatly to see a scientific breakdown of all the compounds found in all the types of teas, green, oxidized, partially fermented, and fully fermented.

maeda-en Green Tea Ice Cream

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Is good. Not great, but definitely very good. maeda-en Green Tea ice cream has a smooth matcha green tea taste. The ingredient list has all sorts of quality ingredients like mono and diglycerides and carageenan. What, you don’t add that to your ice-cream maker at home? You don’t even know what that is? Well these ingredients aren’t that bad and, of course, no one eats ice-cream for the health benefits. At least not if they’re honest with themselves.

My only real gripe is that the green tea flavor is weak. This is surprising since maeda-en is a green tea specialty company. You would think that they would make the green tea taste bolder!

Luckily I have a (very rarely used) ice-cream maker. It might be time to dust off the ice paddle and make a batch using maeda-en matcha powder. Since it’s already September 28th I’d better hurry to catch the last dwindling days of heat (105F yesterday).

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