When a new study comes out, it’s interesting to see who spins it how. YouGov released a survey last month comparing American consumption of tea with coffee. Their headline was “Coffee’s millennial problem: tea increasingly popular among young Americans.” Oh, no! A coffee problem!
World Tea News, on the other hand, reported that same survey with the headline, “America’s Youth Embrace Tea.” Oh, boy! Kids are drinking tea.
Most of the articles I read about the survey included this handy-dandy chart:
It pretty clearly indicates that the younger you are, the more likely you are to prefer tea to coffee. The statistic I liked, on the other hand, I turned into the Venn diagram on my header for this article. Of Americans aged 18-29, 18% drink coffee, 27% drink tea, and 39% drink both (the remaining 17% don’t drink either one). In case you’re interested, 998 people were surveyed and 143 of them were in that “millennial” age range of 18-29.
I’m sure there are some people in the tea business that are saying, “This is marvelous! We just have to sit back and wait and we’re going to own this market!” Others are saying, “We really need to get people over 30 to drink more tea.” The coffee industry, of course, has known about this trend for years. That’s why Starbucks bought Tazo and Teavana.
Being a numbers geek, I decided to pull up the PDF of the full report and do a bit of digging. Here are some interesting points you might enjoy:
- The under-30 crowd is much more likely than the older crowd to drink neither coffee nor tea.
- Blacks are over twice as likely to drink tea only (no coffee) than whites or hispanics.
- 64% of Republicans prefer coffee, vs 55% of Democrats and 52% of independents.
- 33% of independents prefer tea, vs 32% of Democrats and 28% of Republicans.
- Middle-income Americans earning $40K-$80K/year are more likely to prefer tea than higher or lower-income Americans.
- 42% of people surveyed are trying to limit their coffee intake vs only 25% that are trying to limit tea.
- Women are much more likely to prefer tea than men
So let’s see here. A tea shop’s target audience is young women? This comes as a surprise to absolutely nobody in the tea business.
I confess that I didn’t expect some of these results. Since Montana is 89% white and 0.4% black, I don’t really have a statistically significant sampling to judge African-American preferences. I do see, however, quite a few Native Americans in the shop getting tea, although I haven’t tried doing any statistical analysis there.
To what do I attribute the tea-drinking millennial trend? The obvious factor is healthier lifestyles, but I would posit something else as well: younger folks are better informed about tea.
I am much more likely to hear an older person say, “I don’t like tea,” because back in their day, tea meant either a teabag full of basic Lipton black tea or the green tea at a Chinese restaurant. Millennials are more likely to have discovered tea in a tea shop that offers dozens — or hundreds — of options. That person who doesn’t like tea may never have tried masala chai, or oolong, or pu-erh, or white tea, or the huge variety of flavored, spiced, and scented options. They’ve probably never experienced the difference between that teabag full of dust and an FTGFOP-1 golden black whole-leaf tea. They may still be under the mistaken impression that latte means coffee, leaving them blissfully unaware of the wealth of tea lattes awaiting them in a good tea shop.
I’ve said many, many times that if you work in the tea business today, your primary job is education. I think this survey shows that tea education is working. Sure, we still sell your basic Earl Grey tea, but younger folks like the ladies in the picture above are well educated about their options. You’re as likely to see them sipping whole-leaf black Vietnamese tea or Indian oolong as you are a peach-flavored white tea or a sage Earl Grey (popular in our corner of Montana).
So let’s get out there and buy Grandma a great cup of tea!
While writing this post, I was drinking Jasmine King Silver Needle tea. It’s a delicate white tea perfectly scented with jasmine blossoms, so that you get the aroma of the jasmine and the flavor of the tea. Yes, jasmine isn’t just for green tea anymore. Hey, that’s a great tagline. Look for it as a blog post title one of these days!
The coffee industry would have you believe that the word “latte” means “espresso with steamed milk.” That basically is what “caffelatte” means, but “latte” just means “milk” in Italian. A tea latte is every bit as much a latte as a coffee latte, and the growing popularity of masala chai lattes has been bringing that point home to coffee drinkers of late. In the coffee world, a latte is typically made by preparing the espresso, mixing in the milk, and then adding foam on top. The milk is there to add flavor and to cut the espresso so it doesn’t taste as strong. In the tea world, the milk serves a somewhat different purpose. For the record here, I am not talking about Starbucks-style chai lattes, which are made with a sweet syrup. I’m talking about tea that’s fresh-brewed in milk and water.
Flavors and nutrients from tea leaves extract well in water. That’s why a straight cup of tea tastes so good. That’s why people who like milk in their tea traditionally add the milk after the tea is brewed. A lot of other things, however, don’t extract quite as well.
Many of the flavors in a masala spice blend (no, they aren’t chai spices — chai just means “tea” in Punjabi) are lipophilic. Directly translated, this means “fat-loving,” which means that they extract much better in fats (e.g., milk) than in water. That’s why it’s important to brew the masala chai in hot milk and water instead of just adding the milk later. In my tea bar, we’ve done side-by-side taste tests of tea lattes made both ways. We use a milk heater/frother instead of using the steamer that’s found on commercial espresso machines. We tried steeping the tea in water and then adding the frothed milk vs steeping the tea in a 50/50 blend of hot water and frothed milk. In this entirely subjective set of tests using our employees and customers, the lattes brewed with milk won consistently. I realize that our production method wouldn’t work in a typical coffee shop where people are rushing in and out on their way to work. They want their drink now. They don’t want to wait four to seven minutes for a fresh-brewed cup. But in a tea bar like mine, things are different. We make a lot of lattes — close to 1/3 of all of the cups we serve. We offer a choice of milk (nonfat, 2%, whole, half-and-half, soy, almond…), and over 150 different types of tea.
The majority of our lattes are served unsweetened. For those who want it sweetened, however, we do the same thing we do when making traditional sweet tea: we add the sweetener when we’re brewing instead of at the end. Most of our customers go for either plain sugar or agave nectar, but we offer other options there, too: flavored hail sugars, honey, stevia leaf, stevia powder, and other artificial sweeteners. You can’t do something like this in a fast-moving production line environment, but you can do it at home. A milk heater/frother is less expensive than a high-end home coffeemaker. We started out with Keurig units, but found they didn’t hold up to commercial use. There were too many fragile parts, and most of them broke in the first six months (that Keurig unit didn’t even end up on this list of the top 10 frothers). We switched to the Capresso frothPRO and we’ve been quite happy with them. They aren’t the fastest solution, but they’re solid, reliable, and easy-to-clean. It’s also easy to switch between heating/frothing and just heating. If you don’t want to invest $50-$100 in a frother/heater, there’s another solution that works great at home. Just heat the milk in the microwave. Don’t let it go to a boil, but get it as hot as you can without boiling it. There are quite a few handheld battery-powered electric whisks available if you like it frothy; the list I linked in the previous paragraph includes three of them.
How do you know which types of tea work best in a latte? Experiment. One of the most popular tea lattes is called a London Fog. It’s very straightforward: just Earl Grey tea and a 50/50 mix of milk and tea. We usually start the tea steeping in water and add the milk halfway through. Make sure you use the right amount of tea leaf for the total volume of milk and water; if you’re using 8 oz of milk and 8 oz of water, use enough leaf for a 16 oz mug. Many of our blends with cinnamon make good lattes, as do fruity teas. We use sweetened matcha powder for our green tea lattes. Want something different? Try making a strong shu pu-erh latte with chocolate milk. Experiment, have fun, and then teach all of your coffee-drinking friends just how many kinds of latte there are!
I mentioned theanine (C7H14N2O3) in the first post of my caffeine trilogy, but I haven’t really gone into any detail about it. I suppose now is as good a time as any.
Theanine (or more precisely, L-theanine) is an amino acid found in tea, guayusa, and certain mushrooms. It acts as a relaxant, helps to improve concentration, and adds a savory (umami) flavor to whatever it’s added to. Most importantly — at least when we’re talking about tea — is what it does when combined with caffeine.
At the 2012 World Tea Expo, I attended a session entitled “Tea, Nutrition and Health: Myths and Truths for the Layman,” presented by Kyle Stewart and Neva Cochrane. They discussed the relaxation and alertness affect of tea, and also noted that a “2012 study found tea was associated with increased work performance and reduced tiredness, especially when consumed without milk or sugar.”
This caught my attention not only because of the increased work performance, but because it validated my personal preference for tea without sweetener or milk.
Stewart and Cochrane attributed the increased work performance to the combination of caffeine, theanine, theophylline, and theobromine. There have been some excellent articles on theanine, including Tony Gebely’s “Theanine: a 4000 Year Old Mind-Hack” and RateTea’s “L-Theanine and Tea.”
Both of them agree with the conclusion that theanine coupled with caffeine produces a seemingly-contradictory combination of relaxation and alertness. This isn’t news to tea aficionados, of course. People have been relaxing and focusing themselves with tea for millennia. Many of the health benefits of tea come from the caffeine, and those obviously apply to theanine-free drinks like coffee, cola, and cocoa.
Caffeine by itself doesn’t work quite the same way, however.
The “spike & crash” affect of caffeine is well known to any coffee drinker. You’re droopy and tired, you have your morning cup, and you swiftly find yourself wide awake and full of energy. A while later, bam! You’re back where you started, and possibly in a pissier mood than when you started. Yes, I said “pissier.” It’s a technical term. When drinking tea, thanks in large part to the theanine content, the effects take longer to kick in, and also take longer to wear off. Mixing a relaxant (theanine) with a stimulant (caffeine) works quite well in this case.
Wikipedia summarizes a half-dozen studies with this statement:
“Theanine has been studied for its potential ability to reduce mental and physical stress, improve cognition, and boost mood and cognitive performance in a synergistic manner with caffeine.”
“Boost mood,” eh? As I wrote last week, there has been at least one study that indicates tea improves mood. That study, however, defined a good mood as decreased fatigue. It appears that there may be more to the mood-enhancing effects of tea than my previous post indicated!
I try not to obsess over web statistics, for that way lies madness. I do, however, enjoy looking over what web searches bring people to my humble tea blog. One caught my eye today, as it seemed to be just begging for a blog post: “Why does my tea taste like coffee”?
I mentioned in my Keurig K-Cup post last month that the tea it produced did not taste like coffee. There’s a reason that was notable enough to mention: every other coffeemaker I’ve ever used is unable to produce decent tea once it’s been used for coffee. The oils in the coffee may clean off of the glass from the carafe, but they will impregnate the plastic parts of the coffeemaker and there’s not a darned thing you can do about it.
If you want to perform a test, try running a pot of plain hot water through the coffeemaker and take a deep sniff. Then take a sip and hold the hot water in your mouth for a moment. If you can detect coffee at all, then you aren’t going to be able to brew a proper cup of tea from that water.
If, however, you brew mostly strong black teas and don’t detest coffee, you can reach an acceptable compromise. Run that plain water through, but this time add a couple of tablespoons of vinegar to it. It will take another few pots of plain water to get the vinegar smell out, but it will help with the coffee. Once you’ve done that, run one last full carafe of plain water with a tablespoon of bleach. Rinse everything thoroughly and let it dry overnight.
It’s not something you can do with a hotel coffeemaker, but if you want to switch your coffeemaker into a hot water maker for tea, this is a great start.
Is there some particular tea concoction that’s “your” tea drink? Is it something complicated? You’ll hear people every day in Starbucks ordering coffees that take twenty words to describe, but we don’t run in to that much in the tea bar … yet.
Why is it that more coffee drinkers than tea drinkers tend to be like the guys in this PVP Online comic? I think it’s a matter of education and consistency.
Most of our regulars at the tea bar are like me: they order something different each time they come in. I may go through phases where I drink nothing but malty Assam for a few days, but then I’m back to switching it up. I also drink different tea in the morning than I do in the afternoon or evening. Of course, I’m also that annoying guy that will go into a bar four times, order something completely different each time, and then ask for my “regular” on the fifth visit.
We do have some regulars that are consistent, but their drinks tend to be simple: a cup of sencha, Scottish breakfast with a touch of milk, or iced mango oolong. As people learn the menu and zero in on what they like, that is beginning to change a bit, though.
Amber is from the South. She likes her tea sweet, and she loves boba tea (a.k.a. “bubble tea”). I finally put the “Amber special” on the menu so she didn’t have to describe her boba tea made with Cinnamon Orange Spice tea, vanilla soy milk, and triple the usual sweet syrup.
Phyllis isn’t much of a tea fan, but she found herself drawn to Hammer & Cremesickle Red, which is a rooibos/honeybush blend. She likes it prepared as a latte with frothed 2% milk and a bit of honey.
Starbucks has dramatically changed coffee culture, much as McDonald’s has changed restaurants (I’m going to catch grief for that one, I know, but keep reading). You can go into a McDonald’s in an unfamiliar city, and you know that Big Mac and fries will be just like the ones back home. Similarly, you can go into any one of 19,555 Starbucks franchises and be comfortable that your half-caf double-shot venti skinny hazelnut macchiato will taste just like it would from the franchise back home. They have taught the world their own terminology (education) and made sure that the drinks are prepared exactly the same at each franchise (consistency).
Let’s look at those two factors as they apply to tea:
The world of tea is generally not a good place for consistency. Even for fans of a single type of tea, the options are legion. There are dozens of matchas, hundreds of oolongs, and each has its own unique flavor. My tea bar offers six types of milk (nonfat, 2%, whole, half-and-half, vanilla soy, and almond), where another may offer 1%, light soy, and whole. When I went into the tea business’ closest thing to a national chain (Teavana – you can read about my visit here), they didn’t offer milk at all. You may go into one tea shop that has a hundred Chinese green and white teas and an English tea shop that has only black teas.
There’s a strong parallel to be drawn here with independent bookstores and big chains. You can find exactly the same books at a Barnes & Noble in Austin, Texas as you’d find in San Francisco, Denver, or New York. On the other hand, two indie bookstores a block apart can offer completely different experiences.
Tea aficionados revel in this. I enjoy wandering into a tea shop that has dozens of different pu-erhs available and tasting something I’ve never had before, even though I know the odds of finding that 1935 Double Lions Tongqing Hao anywhere else are close to zero (and the odds of being able to afford it are similar).
Tea shops can help a lot with this problem by proper labeling and by knowing the products well enough to compare our wares with popular brands from elsewhere. If someone walks into my shop that likes Constant Comment, I can guide them to my closest loose-leaf blend (that would be the aforementioned Cinnamon Orange Spice). If someone buys a mountain-grown Wuyi oolong in my shop, the next tea shop they visit should be able to give them something with a similar flavor profile.
Consumers can help by asking questions. If I have a breakfast tea I enjoy, I’ll ask the shopkeeper what’s in the blend. Then I’ll know to ask for an Assam/Tanzanian black breakfast tea blend next time I want something similar. I watch (or ask) how much leaf they use and what temperature the water is. Again, if I don’t know how they brewed it, I can’t ask for it to be prepared that way next time.
The tea industry is where coffee and wine were a few decades ago. The average person has no idea what the difference is between a green tea and a white tea, but they know the difference between Merlot and Chardonnay. Tea people need to focus on education the same way wine and coffee people have done.
Educating customers is a bad thing for the mediocre shops. The more people learn about tea, the less likely they are to buy lower-grade products, and the less likely they are to buy from people who don’t know what they’re talking about. Once the person who’s been buying pre-sweetened chai from a box tastes fresh-brewed chai, they won’t be switching back.
On the other hand, education is a great thing for consumers and for good tea shops.
The more you know as a consumer, the better you’re able to find what you like and recognize the good products (and good prices). Educated consumers will frequent the better shops, and spend more money there, benefiting both the shop and the customer.
This article is the first of a three-part series.
In his excellent book, A History of the World in 6 Glasses, Tom Standage selected the six beverages that he felt had the greatest influence on the development of human civilization. Three of the six contain alcohol; three contain caffeine. Tea was one of the six.
Is it the caffeine that has made tea one of the most popular beverages in the world? The flavor? Its relaxing effects? I think that without caffeine, Camellia sinensis would be just another of the hundreds of plant species that taste good when you make an infusion or tisane out of it. Perhaps yerba maté would be the drink that challenged coffee for supremacy in the non-alcoholic beverage world.
“Caffeine is the world’s most popular drug”
The above quote opens a paper entitled Caffeine Content of Brewed Teas (PDF version here) by Jenna Chin and four others from the University of Florida College of Medicine. I’ll be citing that paper again in Part II of this series. Richard Lovett, in a 2005 New Scientist article, said that 90% of adults in North America consume caffeine on a daily basis.
But yes, caffeine is a drug. It is known as a stimulant, but its effects are more varied (and sometimes more subtle) than that. It can reduce fatigue, increase focus, speed up though processes, and increase coordination. It can also interact with other xanthines to produce different effects in different drinks, which is one reason coffee, tea, and chocolate all affect us differently.
Tea, for example, contains a compound called L-theanine, which can smooth out the “spike & crash” effect of caffeine in coffee and increase the caffeine’s effect on alertness. In other words, with L-theanine present, less caffeine can have a greater effect. See a great article from RateTea about L-theanine here.
Even though Part II of this series is the one that dispels myths, I really need to address a common misconception right now. First, I’m going to make sure to define my terms: for purposes of this series, “tea” refers to beverages made from the Camellia sinensis plant (the tea bush) only. I’ll refer to all other infused-leaf products as “tisanes.” Okay, now that we have that out of the way:
“All tea contains caffeine”
Yes, I said ALL tea. The study I mentioned a couple of paragraphs ago measured and compared the caffeine content of fifteen regular black, white, and green teas with three “decaffeinated” teas and two herbal teas (tisanes). With a five-minute steep time, the regular teas ranged from 25 to 61 mg of caffeine per six-ounce cups. The decaf teas ranged from 1.8 to 10 mg per six ounce cup.
That’s right. The lowest caffeine “regular” tea they tested (Twinings English Breakfast) had only 2-1/2 times the caffeine of the most potent “decaffeinated” tea (Stash Premium Green Decaf).
There are two popular ways to remove caffeine from tea. In one, the so-called “direct method,” the leaves are steamed and then rinsed in a solvent (either dichloromethane or ethyl acetate). Then they drain off the solvent and re-steam the leaves to make sure to rinse away any leftover solvent. The other process, known as the CO2 method, involves rinsing the leaves with liquid carbon dioxide at very high pressure. Both of these methods leave behind some residual caffeine.
(As a side note: I’m not a fan of either process. When I don’t want caffeine, I’d much rather drink rooibos than a decaf tea. I only have one decaf tea out of over 80 teas and 20 tisanes at my tea bar, and I’m discontinuing that one.)
This is why tea professionals need to make a strong distinction between the terms “decaffeinated” (tea that has had most of its caffeine removed) and “naturally caffeine-free” (tisanes that naturally contain no caffeine such as rooibos, honeybush, and chamomile).
“Coffee has more caffeine than tea”
Almost everyone will agree with the statement. For the most part, it is true, assuming you add some qualifiers: The average cup of fresh-brewed loose-leaf tea contains less than half the caffeine of the average cup of fresh-brewed coffee. In the seminar, Tea, Nutrition, and Health: Myths and Truths for the Layman, at World Tea Expo 2012, the studies Kyle Stewart and Neva Cochran quoted showed the plain cup of fresh-brewed coffee at 17 mg of caffeine per ounce versus the plain cup of fresh-brewed tea at 7 mg per ounce (that’s 42 mg per six-ounce cup, which agrees nicely with the numbers from the caffeine content study I quoted above).
Interestingly, though, a pound of tea leaves contains more caffeine than a pound of coffee beans. How can that be? Because you use more coffee (by weight) than tea to make a single cup, and caffeine is extracted more efficiently from ground-up beans than from chunks of tea leaf. Tea is usually not brewed as strong as coffee, either.
At another 2012 World Tea Expo seminar, A Step Toward Caffeine and Antioxidant Clarity, Kevin Gascoyne presented research he had done comparing caffeine levels in dozens of different teas (plus a tisane or two). The difference between Kevin’s work and every other study I’ve seen is that he prepared each tea as people would actually drink it. For example, the Bai Mu Dan white tea was steeped 6 minutes in 176-degree water, while the Tie Guan Yin (Iron Goddess of Mercy) oolong was steeped 1.5 minutes in 203-degree water. Matcha powder was not steeped per se, but stirred into the water and tested without filtering.
The results? Caffeine content ranged from 12mg to 58mg for the leaf teas, and 126mg for the matcha — which is higher than some coffees.
In our next installment, I’ll look at the myths regarding caffeine in tea, including what kinds of tea have the most caffeine and how you can remove the caffeine at home all by yourself — or can you?
A few days ago, I posted an admittedly rather snarky article on this blog entitled “Coffee vs. Tea: Do your homework, Fox News.” The main subject of the article was Chris Kilham, the “Medicine Hunter” from Fox News. Chris has responded to the article in email, expressing an interest in carrying on a dialog. Here is what he sent me (verbatim, and in its entirety):
Hi Gary- I saw your mistaken response to my segment on FOX, and thought I’d take time out to reply. Having studied coffee and tea deeply for decades, and having read thousands of pages of science on both, I stand by the claim that coffee is more potently antioxidant ounce per ounce. More Americans do drink black tea rather than green, the fermenting of tea does degrade the antioxidants, and no, the benefits of coffee are not limited to caffeine. I referred to the work of Astrid Nellig, who compiled over 300 human studies on coffee, not the others you noted. And yes, oxidation is in fact “rusting.” The exact same process occurs to cells that occurs to metal, though metal is not living tissue. I see you leave no place on your blog for intelligent feedback. Good idea. Before you rant off on a tangent, you really should get your science together. I have. Point by point I will be happy to go toe to toe. Enjoy.
First, Chris, I hope it was okay to use the thumbnail picture from your Medicine Hunter website. If you would prefer that I didn’t have it on my blog, let me know and I’ll remove it post haste.
Thank you for responding to my post. I appreciate getting feedback direct from the source, and I know you’re busy. Before going through your email point by point, I’d like to start by addressing the very last issue you raise: that there’s “no place on [my] blog for intelligent feedback.” As I said, I actively encourage intelligent feedback. There’s a place on every single blog post for people to leave their comments. If you’re looking at the front page of the site, it’s a link at the end of the post. If you’re looking at an individual article, it’s a section at the end with two tabs: one to see existing comments and one to leave your own. Please feel free to leave your comments on this or any other post on my blog, whether you agree with me or not.
Now, let’s — as you said — go point-by-point, toe-to-toe. I will quote your email, and then respond.
“Having studied coffee and tea deeply for decades, and having read thousands of pages of science on both, I stand by the claim that coffee is more potently antioxidant ounce per ounce.”
I did not dispute this. I said that I was unable to find meaningful studies regarding flavonoid content that covered multiple types of tea and coffee and various ways of preparing them, so I have no way of disproving your claim. What I did say is, “Flavonols aren’t the only basis for measuring the healthiness of a drink.” I will expand that to say that antioxidants in general aren’t the only things that make a drink healthy.
But if you can show me a study comparing antioxidants in coffee with antioxidants in black, green, white, oolong, purple, and pu-erh tea, I would love to see it. Really. I get that question a lot and I don’t have an answer for it.
“More Americans do drink black tea rather than green…”
I agree with you. In fact, I said “One accuracy point for Kilham” after I verified the claim with FAO’s statistics.
“…the fermenting of tea does degrade the antioxidants…”
Black tea is not fermented. This little piece of misinformation is a pet peeve of mine, and it’s one of the things that prompted me to write the original article. Black tea is oxidized. Fermentation is an anaerobic process. There are fermented teas (a favorite style of mine called shu pu-erh is both oxidized and fermented), but they represent such a miniscule percentage of the tea consumed in the United States that they don’t factor into this discussion. I will continue the discussion assuming you meant to say “oxidized” rather than “fermented.”
I am neither a chemist nor a nutritionist, so you’re going to have to tell me what “degrade” means in this context. You had originally said that they were “lost,” and I responded that “Flavonols aren’t ‘lost’ during oxidation; most (but not all) are converted into different antioxidants called theaflavins, and some convert to thearubigins (which produce the reddish hue of black tea).” Am I wrong?
“…and no, the benefits of coffee are not limited to caffeine.”
Did I say they are? No. I said, “But yes, coffee does contain antioxidants. So, in fact, does tea.” My reference to caffeine was specifically related to your claim that coffee can improve a bad mood. Every study that I found showed that you are absolutely correct. Coffee can improve a bad mood because of the caffeine, which means that tea and Mountain Dew can improve bad moods as well.
“I referred to the work of Astrid Nellig, who compiled over 300 human studies on coffee, not the others you noted.”
I am unfamiliar with Nellig’s work, but if the studies are specifically on coffee, they wouldn’t have pinged my radar (I am uninterested in coffee). If any of Nellig’s studies compare coffee with various types of tea, I’d like to read them, though.
“And yes, oxidation is in fact ‘rusting.'”
This could be an interesting discussion. When I was taking chemistry in school, I would have been smacked for saying that, for example, copper had rusted. Oxidizing was presented as the more general term. All rusting is oxidation, but not all oxidation is rusting. Perusing Merriam-Webster’s dictionary, however, I see that one of the definitions of rust as a verb is “to form rust: to oxidize.” And since the primary definition of oxidize is “to combine with oxygen,” I suppose the first part of your statement is true, based on current dictionary definitions. But do you really want to use “rust” as a synonym for “oxidize” in discussing living organisms? Try this:
Substituting “rust” for “oxidize,” a simplified description of the cardiovascular system would say that you inhale air into your lungs, where oxygen in the air is used to rust your red blood cells. Your arteries and capillaries carry those rusted blood cells to the rest of your body, where the red blood cells “un-rust” as they cause other cells in your body to rust. The de-rusted blood cells then return, via veins, to be rusted once again in the lungs.
Accurate, using those current Merriam-Webster definitions, but it sure sounds strange.
“The exact same process occurs to cells that occurs to metal, though metal is not living tissue.”
Really? To the best of my knowledge, metal is unable to use up oxygen and become un-rusted. Living cells can. It’s not the same process.
The “oxidation vs. rusting” discussion is largely semantic, though, and I don’t want this to turn into a massive debate about free radicals and properties of antioxidants. That wasn’t the point. The point was that your “Q&A With Dr. Manny” article went on a great length about health benefits of coffee without acknowledging that many (all?) of those benefits are shared with various types of tea. The only health benefits of tea that you brought up were antioxidants, and that’s only a single piece of the puzzle.
“Before you rant off on a tangent, you really should get your science together. I have.”
Okay, if you want to call my post a “rant,” I’ll have to agree. It was. But it was by no means “off on a tangent.” It directly addressed your Fox News story, directly on-point. It wasn’t off-topic. And I haven’t seen you call out one single scientific error in what I said (unless you want to call my bullheaded prescriptivism on the definition of “rust” a scientific error).
Last Friday, Fox News ran a “Q&A with Dr. Manny” segment to address the question, “Coffee vs. Tea: Which is Healthier?” Dr. Manny Alvarez handed the question off to someone named Chris Kilham, who I assumed was a scientist or another doctor. I was wrong, but we’ll get to that later.
Kilham began with some general statements (e.g., “For centuries, coffee has been praised for its invigorating properties. And it is truly healthy for you.”) and then stated his opinion: “For the most part, coffee is healthier for you.” Wow. That took me by surprise. Let’s continue and see what kind of well-researched and scientifically-backed justification he puts forth to back that conclusion.
The very next sentence is “The majority of people who drink tea, drink it black, and there’s no question that naturally occurring compounds in coffee are exceptionally good for you.” Really? I’m not sure what the first half of that sentence has to do with the second half, but let’s look at the first half.
I’m going to assume that he meant “most tea drinkers drink black tea” as opposed to “most tea drinkers don’t add milk or cream.” If he’s speaking of the United States, then the Tea Association of the USA backs him up. Their Tea Fact Sheet says that 80% of the tea consumed in the U.S. in 2010 was black tea. Worldwide, statistics vary. Teavana, for example, in the “Types of Tea” section of its website, says that “Green tea is the most popular type of tea, mainly because it is the beverage of choice in Asia.” The Food and Agriculture Organization of the United Nations (FAO) disagrees, however, stating that projected 2010 tea production was 2,443,000 tonnes of black tea vs. 900,000 tonnes of green tea. No offense, Teavana, but I think I’ll go with FAO’s numbers on this one. One accuracy point for Kilham.
Next, he proceeds to say that, “Two large cups of coffee, or 300 milligrams of caffeine per day, can improve a negative mood.” Assuming he’s referring to studies like Rogers & Dernoncourt, Haskell et al, or Peeling & Dawson, it’s the caffeine that has the effect, not the coffee per se. So it not only applies equally to coffee and tea, but you could get the same effect from swilling a two-liter of Mountain Dew.
“Rusting of cells in our bodies? Rusting? And they quoted this guy as an expert?”
His next claim starts with, “Research into the chemical properties of coffee show that a cup of Joe contains potent, protective antioxidants, which inhibit the rusting of cells in our bodies.”Whoa! Back up here. “Rusting of cells in our bodies?” Rusting? And they quoted this guy as an expert? Metal rusts. Cells don’t. Oxygen is the basic fuel that keeps our cells going. Our entire cardiovascular system exists to get oxygen to our cells. *sigh*
But yes, coffee does contain antioxidants. So, in fact, does tea. He proceeds to tell us, “Coffee is especially high in one group of antioxidants, flavonoids.” I attempted to find out whether coffee or tea contains more flavonoids, but there are just too many variables. Suffice it to say they both have plenty.
“And this next paragraph is where Kilham really shows his ignorance about tea.”
And this next paragraph is where Kilham really shows his ignorance about tea: “But if you’re drinking green tea, which is simply tea that hasn’t been fermented, then I would probably have to say that green tea is the healthier drink. It’s rich in flavenols [sic], which are lost when the tea is fermented.” Where do I even start with this?
- First of all, green tea isn’t simply “tea that hasn’t been fermented.” Black tea hasn’t been fermented, either. Nor have white tea and oolong tea. Either Kilham doesn’t know the difference between fermentation and oxidation, or he doesn’t know the difference between black tea (which is oxidized) and pu-erh tea (which is fermented). I’m guessing both, and I’ll henceforth assume he means oxidized whenever he says fermented.
- Next, it’s “flavonols,” not “flavenols.” If you’re going to babble pseudoscience, at least spell the words right.
- Flavonols aren’t “lost” during oxidation; most (but not all) are converted into different antioxidants called theaflavins, and some convert to thearubigins (which produce the reddish hue of black tea).
- Flavonols aren’t the only basis for measuring the healthiness of a drink. Focusing on them to the exclusion of everything else shows that Kilham just didn’t bother to do any research on tea.
He finishes his answer with the standard platitude of the underinformed: “The bottom line: If you’re talking about coffee and black tea, coffee is the healthier choice. If you’re a green tea drinker, green tea is the healthier choice.”
What’s wrong with that conclusion? It oversimplifies the issue and ignores all of the tea styles other than green and black. It doesn’t look at different types of black tea (or variants like the new purple tea from Kenya) or different ways of preparing them.
When I first wrote this response (before Firefox crashed and killed it), I didn’t know who Chris Kilham was. As I mentioned earlier, I assumed he was a medical doctor, researcher, or scientist. When I went to his website, however, I found that he’s a “medicine hunter, author and educator” who “travels the world in search of traditional, plant-based medicines, and works with shamans, healers, growers, harvesters, scientists, trade officials and other plant medicine experts in dozens of countries.” Yep, when I want accurate scientific health information, I go to shamans and healers.
There’s a quote from Dr. Alvarez that says, “I love adventure! That’s why I love teaming up with The Medicine Hunter, Chris Kilham.” Very telling. Alvarez didn’t call Kilham because he loves accurate information or well-researched responses. He called him because he loves adventure! Of course.
I think I’ll have another cup of tea and improve my mood.