Caffeine in Coffee Depends on a Number of Factors
Have you ever wondered precisely how much caffeine is in that cup of coffee or espresso you are drinking?
The answer is that a typical shot of espresso contains about 40-50 milligrams of caffeine, while a typical cup of coffee has about 100-120 milligrams of caffeine. But these are not 100% correct answers.
A normal brewed coffee will contain on average, 11.8 mg caffeine per fluid ounce of brewed coffee, according to the USDA.
Note that most coffee machine manufacturers define their "cups" as 5-oz cups. For example, a 12-cup coffee machine will be brew 60 fluid ounces of coffee. You can then multiply 60 fluid ounces by 11.8 mg to get 708 mg of caffeine per pot of coffee for that specific machine. You may be interested in our how much coffee per cup article for more details.
A fluid ounce is 30 ml of fluid, as opposed to an ounce of weight, which is 28 grams.
Of course the exact amount of caffeine depends upon various things like what type of coffee beans you are using (Robusta beans have significantly more caffeine than Arabica beans), what coffee coffee brewing method you are using, how long the coffee beans were roasted (roasted diminishes the caffeine content), the extraction time and water temperature, and other factors.
- Caffeine Content by Single Origin
- Caffeine by Coffee Brand
- Caffeine by Tea Brand
- Does a Medium Roast have more caffeine than a Dark Roast?
- Does Robusta have more caffeine than Arabica coffee?
- How Much Caffeine in a Cup of Coffee
- Caffeine Impact on Health
- Caffeine in Single Origin Coffee Beans
- Some Caffeine Stats
- Caffeine in Folgers Black Silk
Caffeine Content by Single Origin
Single Origin: Percentage (by weight)
- Brazil Bourbons: 1.20%
- Celebes Kalossi: 1.22%
- Colombia Excelso: 1.37%
- Colombia Supremo: 1.37%
- Ethiopian Harrar-Moka: 1.13%
- Guatemala Antigua: 1.32%
- Indian Mysore: 1.37%
- Jamaican Blue Mtn/Wallensford Estate: 1.24%
- Java Estate Kuyumas: 1.20%
- Kenya AA: 1.36%
- Kona Extra Prime: 1.32%
- Mexico Pluma Altura: 1.17%
- Mocha Mattari (Yemen): 1.01%
- New Guinea: 1.30%
- Panama Organic: 1.34%
- Sumatra Mandheling-Lintong: 1.30%
- Tanzania Peaberry: 1.42%
- Zimbabwe: 1.10%
- DECAFS: all @ .02% with Swiss Water Process
(Source: Newsletter--Mountanos Bros. Coffee Co., San Francisco)
eg. if you use 10 grams (10,000 mg) of coffee (generally, 2 tbsp), with 1.20% caffeine by weight, you'll get roughly (10,000 mg * 0.012 =) 120 mg of caffeine.
Note: caffeine is not necessarily 100% extracted via all brewing methods. For example, roughly twice as much caffeine is extracted by espresso brewing methods (high pressure, high temperature) than by standard drip-brewing. This means you won't get 120mg of caffeine per 5.3 ounce (160 ml) brewed coffee.
These numbers may be correct for the coffee offered by Mountanos Bros. Coffee Co., but they probably are not neccessarily correct in a generic way. Caffeine will vary from farm to farm, and plant variety to plant variety, and even year to year.
Should you choose a coffee based on caffeine content? Absolutely not. Coffee should be chosen based on flavor. If you need more caffeine, just drink another cup 🙂
Caffeine by Coffee Brand
Note that serving sizes vary by brand, which makes a direct comparison slightly more difficult.
Caffeine by Tea Brand
Does a Medium Roast have more caffeine than a Dark Roast?
Since coffee roasting only marginally decreases the amount of caffeine, a light roast, medium and dark roast will have negligible differences in caffeine content. There are myths that go both ways, with people claiming light roasts have more caffeine (negligibly true), and others claiming dark roasts have more caffeine (likely due to a more developed "coffee" flavor), but good old science comes to the rescue here:
Caffeine did not undergo significant degradation with only 5.4% being lost under severe roasting. Source
This is further offset by the fact that green coffee loses anywhere from 10%-20% of it's weight during the roasting process (evaporation of water) - meaning darker roasts may or may not have slightly more caffeine when comparing exact weights after roasting.
In general, however, it is true that a cup of regular Drip-Brewed, Arabica coffee with a medium roast will have about 120 milligrams of caffeine, and that a 30 ml shot of espresso with an espresso roast and Arabica coffee beans will have about 120 milligrams of caffeine.
Does Robusta have more caffeine than Arabica coffee?
As a general rule of thumb, robusta has approximately twice as much caffeine as arabica.
This will vary depending on specifically which arabica beans you're comparing against specifically which robusta beans.
The only way to know this, is by submitting samples to a lab for chemical analysis.
How Much Caffeine in a Cup of Coffee
It was 1819 when German chemist named Friedlieb Runge isolated caffeine though the first coffee shops had been opened in 1530 in Istanbul, Damascus and Syria.
In nature caffeine serves as a natural pesticide helping plants defend against predators including harmful insects.
When caffeine is consumed it leads to more alertness and energy through its ability to mimic a compound called adenosine that binds to the adenosine receptors of the brain. When this happens it has the effect of blocking real adenosine from its job of creating a feeling of drowsiness and slowing nerve impulses.
- A regular 43-gram Hershey's Milk Chocolate bar contains about 10 milligrams of caffeine.
- A typical cup of Decaffeinated Coffee containing about 7 ounces will likely have about 10 milligrams of caffeine.
- A 6 ounce cup of black tea will likely have about 50 milligrams of caffeine and green tea only about 30.
- You will get about 34 milligrams of caffeine in a 12 ounce Coke.
Caffeine can be chemically synthesized though this is not commonly done since caffeine is so easy to get as a by-product of decaffeinating substances with caffeine, such as coffee beans.
If you are wondering how much caffeine is in a cup of coffee because you are worried about your overall caffeine consumption then realize that there are many factors involved, and also remember that Instant Coffee is typically made using Robusta coffee beans which have about twice as much caffeine as Arabica coffee beans.
Caffeine Impact on Health
In general moderate amounts of coffee have only a mild effect on the body and do not cause the problems associated with excess caffeine intake.
Caffeine is actually negatively correlated with all-cause-morality: https://www.ncbi.nlm.nih.gov/pubmed/28697850
This means that coffee drinkers have a lower chance of dying in a given year, than non-coffee drinkers. The exact mechanism is unknown (anti-oxidants, life-style factors, or being more alert), but the general consensus is that drinking coffee is healthy.
If you are trying to quit drinking coffee and worried about caffeine withdrawal symptoms due to the caffeine in coffee that your body has become so accustomed to, then just reduce your amount of intake a little each day and you will barely notice any craving effects that may be associated with stopping caffeine intake.
You can also try drinking Decaffeinated Coffee since much of the pleasure of enjoying a cup of coffee in the morning is preserved and you may not even miss the caffeine at all since the warm beverage itself does a lot to help wake you in the morning.
With the French Press brewing method using strong coffee beans one cup of coffee can have way more caffeine in it that a moderately brewed cup, so you may just try using fewer grinds when you brew your coffee. If you like to visit Starbucks and enjoy espresso drinks then perhaps just ask for one shot of espresso instead of two.
The body's liver metabolizes caffeine after it is consumed and the stomach and small intestine absorb it, usually in less than one hour, and it proceeds to spread throughout the tissues of the body.
Caffeine in Single Origin Coffee Beans
To make a real difference in the caffeine content of a blend, you'll need to add Robusta beans rather than playing with varieties of Arabica. The blend shouldn't be dictated by how much caffeine you can squeeze out of it however - taste will always trump
Some Caffeine Stats
The chemical formula of caffeine is C8H10N4O2 and the chemical name of caffeine is 1,3,7-trimethylxanthine, and it is found in about 60 different plants.
About 450,000 cups of coffee are consumed in the U.S. every day.
Most humans consume their caffeine by getting it from either coffee beans or tea leaves, or else from various beverages that contain extracted caffeine, or from various natural sources like cocoa beans, the kola nut, Yaupon Holly, yerba mate and guarana berries.
Every day around 90% of adults in the U.S. consume caffeine.
Caffeine in Folgers Black Silk
Folgers Black Silk has roughly the same caffeine content as regular folgers coffee. As noted above, coffee only loses roughly 5% of its caffeine content between a light roast and a dark roast. While Folgers Black Silk is a very dark roasted, strong-tasting coffee, it will not have significantly less caffeine.
Folgers coffees contain 30-40mg caffeine per 1 tablespoon of ground coffee, which is 60-80mg caffeine per 12-oz brewed coffee.
re: Mountanos Bros. listting of caffeine content.
The list you furnish from Mountanos Bros. claims 1.01 to 1.42 caffeine in their coffees. The question was asked as to what the units were, and one person responded they were percentages. Elsewhere, you list a brewing recommendation by the SCAA as 10g coffee in 6 oz water, resulting in 5.33 oz brewed coffee. Taking those numbers as typical, if the Mountanos Bros. list indicated % caffeine in the bean, we would have 10g coffee with 1.01% caffeine (101 mg), up to 1.42% caffeine (142 mg) in a 5.33 oz cup of coffee. If the results indicated % caffeine in the finished coffee, figuring 1 oz water as 30 grams (160 g water in a 5.33 oz cup), we would have 1616 to 2272 mg, respectively. From what you post here, and in other sources I've read, 101 to 142 mg sounds in the ballpark for a cup of coffee; 1616 to 2272 mg looks way out of bounds. Wikipedia notes that the LD50 for humans is in the range of 150-200 mg per kg body weightâ€”about 12,000 mg for a 180 pound person; in other words, about 84-6 oz cups by the first reckoning (percent caffeine in the bean), and about 5 cups by the second (percent caffeine in the cup). Seems that % caffeine in the bean is the meaning of the Mountanos Bros. list.
re: Don't write off decaf based on a few bad examples
To the person who said "decaf is out of the question, tried that already": you're making a sweeping judgement of all decaf based on trying how many? And what kinds? Should a person whose first taste of coffee was bitter burnt percolated sludge never try Starbucks? There are different quality levels available in just about everything. Think about it. If you like coffee enough, you'll find a way to enjoy it that doesn't give you the problem you've had with it so far. Just don't give up, and don't write off entire areas based on a few bad examples. Here's something I've recently learned that might not be for you, but will hopefully open your eyes a bit: you can buy decaf green beans, roast and grind them yourself, and have some of the richest, most delicious coffee you've ever had, without all the caffeine. So there's a good chance you can find a company that roasts and grinds decaf you like, and maybe even sells it via the Internet.
re: Now, all this being said...
if you experience any of the following with your consumption of caffeine...CONTACT A DOCTOR: Rapid, fluttering heartbeat; chest pain, fainting, weakness, or any change in your mental status (i.e. difficulty concentrating, speaking, etc.)
Just a note to everyone: Be careful with this - it can destroy important bacteria in your colon. As with enemas in general, too frequent cleansing can also be bad for your health. Always consult a doctor first.
re: Enjoying coffee
I suggest that you try a coffee enema. I know it sounds extreme but this is what I do. I have been doing them for 4 months. I have also helps 5 others with great results. Read up on google. You will find great reports. Watch the movie the Gerson Miracle.
re: A shot of espresso contains
A shot of espresso contains approx 75mg of caffeine and a 16oz cup of coffee contains about 300mg. So, 4 shots of espresso would be similar in caffeine content to 16oz of brewed coffee. But, as was mentioned earlier, espresso processing leaves the oils in, similar to what happens with a French Press, which can raise your blood fats. Coffee brewed through a paper filter will have the fats filtered out. Also, as for mild vs dark roast, the caffeine content is not different enough to measure unless you were going to do a science experiment with every cup brewed. It depends on the type of bean ex: robusta vs arabica, the varietal of tree, and many other factors. If you are worried about too much caffeine, drink water, because even decaffeinated coffee still contains caffeine.
re: Drug Intervention Maryland
A drug, broadly speaking, is any chemical substance that, when absorbed into the body of a living organism, alters normal bodily function.There is no single, precise definition, as there are different meanings in drug control law, government regulations, medicine, and colloquial usage.It defines a drug as "a chemical substance used in the treatment,
cure, prevention, or diagnosis of disease or used to otherwise enhance physical or mental well-being."Drugs may be prescribed for a limited duration, or on a regular basis for chronic disorders.Some drugs can cause addiction and habituation.Many natural substances such as beers, wines, and some mushrooms, blur the line between food and drugs, as when ingested they affect the functioning of both mind and body.
Drug Intervention Maryland
re: decreased HR
I actually think doses of caffeine slightly decrease heart rate...
Benowitz, Neal. "Clinical Pharmacology of Caffeine." Annu. Rev. Med. 41 (1990): 277-88.
Page 4 of 15 in the pdf.
Since caffeine is a vasoconstrictor, the baroreceptor reflex would actually decrease heart rate to ease stress on the system...
re: I don't think that is right.
I don't think that is right. It could be weight percent. It would not correlate to making 100 g of coffee.
actually 1/3 caff - I was told by my Dr. to cut down on the caffeine since my by-pass. It took a few weeks to drop from over 1000mg/day (lots of tripple shot lattes and red-bull yag's) to about 100. Now I use 2 parts decaf beans to 1 part french roast (just enough to make the brew palatable.) Although I'm back up to 2-3 cups a day, my heart rate is staying under control.
How much caffeine is in:
2 shots starbucks espresso (4 oz)
4 oz Itallian coffee made on a stovetop moka express with 4 tsp coffee powder?
re: It's a percentage,
It's a percentage, percentages don't have units. As caffeine is a solid, the figure would be percentage by weight. ie 1.37% = 1.37g of caffeine per 100g of coffee
re: Caffeine as a drug
I teach pharmacology to respiratory therapy and nursing students and I'd like to address some misperceptions being shared on this forum, the information provided is my educated opinion, if you have any concerns about how this may affect your health contact a MD; anything stated here is not meant to replace consultation with a MD (sorry- this is legalise for "If you think you have any medical condition related to or aggrevated by caffeine contact a doctor". 1- Caffeine, theobromine, and theophylline belong to a class of drugs called xanthines (or methylxanthines) and they all exert pretty much the same effect on the human organism- i.e. increased pulse, increased heart rate, increased blood pressure, bronchodilation, diuresis, diarrhea, etc.(see GOODMAN & GILMAN, Textbook of Clinical Pharmacolgy), but ONLY IN RELATION TO THE DOSE CONSUMED and EACH INDIVIDUAL'S RESPONSE TO CAFFEINE (Put more simply: your response is based mainly on how much caffeine you consume and how your individual metabolism reacts to caffeine), 2- There are many studies that show that the physiologic response to caffeine decreases with prolonged consumption, resulting in the need to consume more caffeine to get the same response, and 3- Don't confuse psychological dependance (i.e. "I don't feel good if I don't get my caffeine fix.") with true addiction (a change in the function of the brain in response to continued exposure to the "drug" in question). There have been dozens of studies done in so-called caffeine addicts where they are given decaf coffee and the report no ill effects. Yes, your body can become dependent on the effects of caffeine, but in my experience they are short-lived and go away over time.
Now, all this being said, if you experience any of the following with your consumption of caffeine...CONTACT A DOCTOR: Rapid, fluttering heartbeat; chest pain, fainting, weakness,
or any change in your mental status (i.e. difficulty concentrating, speaking, etc.)
There are some reliable sources for information about drugs everyone should know about:
1- Contact your local pharmacist (local first, hospital second), 2- Google E-Medicine and look-up the drug in question.
re: 4-8 shots will make you high
4-8 shots will make you high as a kite and therefore believe that you are full of energy and healthy. Meanwhile precious Calcium is being leached from your bones, more than you can keep up with in pills (supplements). My grandfather went to his grave with bad osteoporosis from drinking 4-5 cups of coffee/day since age 18.
I love coffee but I drink decaf and only a few times per week, occasionally I splurge and have a 1/4 reg (it tastes so good!). I quite regular when I was told I was getting breast lumps from the caffeine at AGE 19! Cut it with 1/4 decaf per week until it's all decaf and it's not a bad transition.
-I come from a scientific nutritional background BTW BS, MS, HHC, AADP -etc
The power of marketing, is really impressive.
re: Caffine is a drug
Most people dont know that caffine is a drug as well. Though many people don't ever need help some people do experience withdrawal from it.
re: To much Caffine
Generally, coffee grown at low altitudes has less caffeine than high altitude coffee. Robusta coffee has considerably more caffeine than arabica coffee, but less 'coffee' flavor. In addition, the roasting time affects how much caffeine is present in coffee, with lighter roasts having more caffeine. The darker the roast, the less caffeine makes its way into the final brewed coffee.
Caffine also has a nasty effect on bladder.
Wow, I have never heard about it. And that`s really amazing! Cocoa also includes caffeine and I have found information that cocoa can be the elixir of youth and slow down the aging process:
re: have you tried a low acid
have you tried a low acid coffee, for many people the heartburn is caused by the acid, not the caffeine.
barista in SL, MI
re: I can't really tell
I have a lot of customers that will order a 'half caf', which is half caffeine, and half decaffe coffee. My husband likes Ferris coffee, which does not give him heartburn, another side effect of coffee for a lot of people. <URL removed by site EspressoCoffeeGuide>
I hope this helps. 🙂
re: RE:how much caffeine in coffee vs. espresso?
could be but I don't want to speculate.
re: how much caffeine in coffee vs. espresso?
I see that the numbers have "%" sign after it,, so does that mean mg. per ml.? I've usually seen it expressed as mg. in a cup, ether 8 oz. or 6 oz.(can you believe this used to be the typical size of a coffee cup, lol.
re: RE: How much caffeine in coffee vs. espresso?
You make a good point. I don't have the original source so I can't see what info was in the source. This does kind of make this section less useful for
anything outside of a comparison of varietal vs varietal and as I
stated in the article I'm not really sure how accurate it is even for
re: How much caffeine in coffee vs. espresso?
You realize of course that those numbers are totally useless without putting what units in what quantities you mean. Is that 1.37 Grams per ounce? mg. per cup, what size of cup? That could be grains per bagful for all we know. Please find the measurements and add to yor page. It would be greatly appreciated.
Arizona Employee Handbook
So there is so much caffeine in stuff I eat or drink. Reading the products above, almost 80% of the bought products that I consume have caffeine. I never knew that.
re: I had no idea about this. I
I had no idea about this. I had an addiction for coffee and after i've cured this i wasn't allowed to get no caffeine in my lunch and now i see i did it involuntary.
re: as far as the second
as far as the second question goes yes in a way u will get more of a boost from more caffeine and depending on how much caffeine u consume on a daily basis it may last longer too...but there is a few other variables....personally speaking i have been to the point where i burned my body out by having too much caffeine in my body after a while ur body will adjust to higher levels of coffee and the cafeine "HIGH" will were off much sooner then expected and at a faster rate.
also there are a few other things to consider caffeine is addictive also sooner or later it will b to the point where u will require it for everyday tasks
caffeine also (from my thought i am not positive and correct me if i am wrong) is not the only thing that speeds up ur heart i am thinking that it may also trcik ur body into producing more norapinephrine which in turn will break down into epinephrine which will speed up metabolism and heart rate
also another thing there is a risk too when taking caffine in the end it will leave u with a low because it burns out ur body and several senses are greatly decreased such as thought process and some motor skills it is best to use caffeine as a last resort rather then an everyday ritual
(hopefully my infrmation is as accurate as possible i am not a doctor but i have been taught about things such as this from wash U professors doctors and some physicians i am only in high school so i would appreciate it if any mistakes or misunderstandings be corrected i appreciate that thank u)
re: I can't really tell the
I can't really tell the difference but I sure know that every time I drink coffee I get heart palpitations. The thing is that I can't stop although I know it's bad for me. Isn't there any kind of coffee that works better for me? Decaffeinate is out of question, I 'have tried it already.
re: 4 to 8 shots of espresso a
4 to 8 shots of espresso a day may be worse for your health than any regular brewed coffee simply because the espresso process also extracts the fatty oils in coffee that can contribute to cholesterol.
Also, a strong cup of brewed coffee (light or dark roast) can feasibly contain over double the caffeine than a shot of espresso. So, 16oz of brewed coffee could feasibly contain more caffeine than 4 shots of espresso.
As for your comment that you think your health has improved, you may want to look into how it may also be causing you to post obnoxious messages on websites.
i drink 4-8 shots of
i drink 4-8 shots of espresso every day, if anything my health has improved because of it(this is equiv to twice to 4 times as much caffeine as you)
re: Correct, but...
I am tired of getting the same old "light roast has more caffeine than dark roast coffee" from the under-informed, overly-pompous baristas across the counter. The fact of the matter is that the answer to the question of whether light roast has more caffeine or not, is both YES and NO. It all depends on how you are measuring it. Say what?
Yes, caffeine levels remain stable during the roasting process. Yes, the caffeine level is determined by the green-bean. Here's where it gets tricky. The roasts that are considered "light", are chosen to be roasted that way, because of very specific characteristics in the green-bean, these characteristics, usually accompany beans with a higher caffeine content. So yes, BEAN FOR BEAN, light roast coffee has more caffeine in it (in general) than dark roast coffee.
So why the "No" then? Well, during the roasting process, caffeine does not break down, but what IS extracted and manipulated by the roaster, is the Moisture-Content of the green-bean. The darker the roast, the less moisture content. The less moisture content, the smaller and less Mass, the roasted bean will have. Meaning?
Proper coffee proportion standards are measured by weight, not by by the number of beans you put into your preffered method of brewing.
SO, You will need to use MORE dark roasted beans, to produce the same weight of ground coffee, than you would have to use of ligther roasted coffee. So any minute variables there are in caffeine levels, are either cancelled out by this equasion, or resulting in a higher caffeine level of a darker roast coffee.
So, Yes and No. It all depends on how you're measuring it! If this doesn't make sense, email me and I'll be happy to explain further.
re: You said it yourself--55 mg.
You said it yourself--55 mg. That's half a small cup of coffee. So question #1, have you ever lived through a cup of coffee? How 'bout two? If so, I doubt it's the caffeine. (Although I'm about the most anti-caffeine guy out there...)
re: seizures & caffine
does too much caffine cause seizures - I was taking metaboless ultamate tablets to enhance energy and diet - control my appatite (this bottle did not contain efedra which I think is now banned) - I had a seizure after taking metablite with efedera four years ago - I noticed that each tablet contains 55mg of caffine, along with other stuff- serving size is 2 tablets before meals not to exceed 6. thank you
re: Sort of
Caffeine is actually stable during roasting. The amount of bean lost does not vary greatly between the few minutes(at most) that distinguish a dark roast from a lighter one. Caffeine content is more a matter of the raw bean(Arabica,Robusta, etc.) and the brewing method than anything else. At the same time, a bold coffee is not necessarily roasted longer than a mild one. Kenya, for instance, benefits from a shorter roasting time but the fruity and exotic flavor profile often means it is considered a bold coffee. Some Latin American coffees are roasted longer to achieve the right balance of flavor and acidity, but they still come across as mild. At any rate, a chemical analysis could determine statistically significant differences in caffeine content, but that wouldn't mean a consumer would be able to perceive any difference.
re: Bold or mild only describes
Bold or mild only describes flavour, not caffeine level. However bold coffees(darker roasted) are likely to have been roasted for a longer period of time versus light roast (mild) coffees. Roasting is a heating process. The longer the bean is heated, the more caffeine is lost (dark roast). The less the bean is heated, the less caffeine is lost. So, in most cases (though not all) dark roast coffees, while having a stronger taste, have less caffeine than mild coffees.
re: The stimulant found in
The stimulant found in guarana beans is called 'guaranine', but is indeed the exact same chemical compound as the caffeine found in coffee. The two different names are used for historical reasons.
re: So I'm still confused, does
So I'm still confused, does bold or mild have more caffeine?
re: Coffee and Caffeine Content
Actually, espresso has LESS caffeine in it than drip coffee, not that it makes a difference in the answer to your question. Your assumption is on the right track, but not quite right. You'll get a big initial boost because you're taking in more caffeine. You'll also get a longer boost because you're taking in more caffeine. About half the amount of caffeine that you ingest is metabolized in four hours - so if you drink more, you'll get a bigger boost in the first four hours, and in each succeeding four hour period until there's not enough left in your system to cause an effect.
The turbo coffee that 7-11 has recently introduced here in New England (and I assume it's the same across the country) is a blend of coffee, guarana and yerba mate. The latter two are used in many cultures the way that we drink coffee, for the caffeine boost, so it's not so much a matter of the difference between mild and bold beans as it is having three different sources of caffeine.
There is, however, a big difference in caffeine content of different kinds of beans. Generally, coffee grown at low altitudes has less caffeine than high altitude coffee. Robusta coffee has considerably more caffeine than arabica coffee, but less 'coffee' flavor. In addition, the roasting time affects how much caffeine is present in coffee, with lighter roasts having more caffeine. The darker the roast, the less caffeine makes its way into the final brewed coffee.
re: 7-11 has this new "turbo
7-11 has this new "turbo coffee" , which draws a few questions:
1. i'm assuming it is turbo because there is more caffeine, but is there really that much of a caffeine variance between mild and bold beans to declare them as "turbo", or is it just a marketing scheme?
2. A red eye at starbucks is a cup of coffee with one shot of espresso, would this have a longer lasting effect on me than a regular cup of coffee? I assumed it would give you a huge initial boost, but then wear off in the same amount of time as if having plain coffee?
re: Guarana and Mate
The reason Guarana and Mate "feel" different is because the caffeine is not as easily metabolized by the body as opposed to coffee and to a lesser extent tea. The caffeine in coffee is readily soluable in water (hot) which is not the case with Guarana. Guarana has a tendency to act as if it were a "time release" stimulant and taken in similar caffeine doses to coffee actually has less of an immediate effect. The different "feel" from Guarana is most often due to the fact that the dosage is way higher than with an average cup of strong coffee.
re: The combination of the
The combination of the caffeine in guarana and some other chemicals results in the guarana-sourced caffeine to actually be released slower and more steadily into your system. That's why it doesn't give you jitters - instead of POW all of it hitting your blood and metabolism at once and then wearing off in a few hours, it seeps into your blood stream slower, but continues doing so for a longer time so you have a more sustained effect.
Of course, if you just chemically extracted the pure caffeine from the guarana you won't get this effect - there's nothing special about the caffeine itself. It takes the combination of chemicals. I totally forget what the helper chemicals are though :/
re: I drink 16 oz. of light
I drink 16 oz. of light roast coffee everyday. Is it harmful to my health?
re: Not necesarily.
I have edited the above article to clarify this further.
re: I think people want to know,
I think people want to know, if I order a large coffee, will the light roast or the dark roast have more caffeine? What you say seems to favor the light roast for more caffeine - given the same cup size.
re: It's important to realise...
It's important to realise that Guarana is Caffeine, they're the exact same compound, it's just that they have different names because they come from different sources.
re: Luckily no!
With normal high pressure methods (such as pressure based espresso) and the acceptable heating within those methods the caffiene structure is stable. It will not reconform into another toxic or other biologically active state with just tempterature. If you are interested, check out the mechanism of its function to understand it better: Caffiene from Wikipedia. This offers a good beginning introduction into how it works.
re: Guarana soda pop
"Guarana soda pop is ubiquitous in Brazil and often available at tropical groceries here."
How much caffeine does it have?
re: caffeine in different teas
Refer to this site for details on different
caffeine contents in tea.
Your site along with others simply distinguish imported and local tea. It is my understanding that there is a great difference between black and green tea. Is that not true? If so, how do the caffeine levels in each break down and compare to each other and coffee?
re: Will the caffeine break down
Will the caffeine break down at high temperature or under certain conditions? Will caffeine being changed to something else?