Doctor's Note

I’ve reviewed various health aspects of coffee before:

What else can we consume to live longer?

For more on controlling acid reflux, see Diet and GERD Acid Reflux Heartburn and Diet and Hiatal Hernia.

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  • Wade Patton

    Now how are we defining “cup”? Because the “old standard” measure for a cup of joe is not 8 oz. It is 6. And here in America I buy a “small” “cup of coffee” served commercially and it is usually 12-18 ounces. So two “cups” of that is actually four or six actual “cups of coffee” in the classic measure. Maybe we nail down a measurement for a bit more accurate comparisons? Thanks

    Nutrition without calories this coffee and tea!

    “Energy Drinks” great example of how our food industry markets things. We all know what we are referring to when anyone uses the term “energy drink” but I like to remind folks that there is NO ENERGY without calories. That those are in-fact, Stimulant Drinks.

    • Joe Caner

      Oh, that’s easy. A cup coffee is a double shot of espresso made from freshly roasted AA Kenya coffee beans.

    • Jim Felder

      A “cup” of coffee is 6 ounces of water, but ~5 ounces of brewed coffee, since the grounds hold onto quite a bit of the water. But if you asked most people what size a cup of coffee is, they would say it is the amount of coffee that will fit into their cup they use for coffee and probably give you a funny look for asking such a dumb question.

      When I used to stop at the local gas-and-crap food convenience store on my way to work, all the sizes of coffee were the same price! So being a cheap engineer, my optimizer program immediately guided my hand to the 20 oz size. I must have not been the only one to make that same choice because the 20 oz cup slot was always running low on cups and the rest were always full. I would even sometimes around 10 or so get another “cup” of coffee from the coffee club pot at work. Of course my office coffee “cup” also did wonderful duty as a soup bowl when I needed to heat my lunch in the microwave. Then when I couldn’t get to sleep at night I could never figure out why. It couldn’t be coffee since I only had one maybe two “cups” of coffee during the day! :-)

      • Wade Patton

        And just a few weeks ago I found myself a bit tipsy after just three beers. The first one was a quart and the second two were 24 oz. each. hiccup!

  • Slim055 .

    I feel so much better after long-term stopping (more than one year without) of all caffeine drinks. Try life with and without, and see how you feel. All the best.

    • Wade Patton

      If I start having sleep issues I cut back or quit. I’m one of those odd-folks who can quit caffeine and yet function (have done it more than once). But I like my level of moderation now, ESPECIALLY when I’m roasting my own beans from places like Ethiopia. If the only coffee was the standard American drudge (SAD), then yeah-give it up!

    • Stewart E.

      Over the years I became more and more caffiene sensitive until I was drinking only decaf. One cup of full caffeine coffee in the morning would keep me awake at night. Then with the necessity of a plant based diet I began consuming lots of cruciferous veggies. Now with ample sulforaphane my liver seems be doing its job and I have no problem sleeping after coffee. Indeed I even seem more relaxed.

      • Charzie

        My dad used to get up in the wee hours, have a cup of coffee and go back to sleep! I can drink it before bed and it never seems to affect me either, but I rarely do. If I drink too much too often, I get headaches when I skip it, which I don’t do often either, but still. Dependencies suck!

    • Blaice

      Made no difference to me, still doesn’t really. I never started drinking coffee until I turned 25 because my SO drinks it. I drink it everyday at work now almost, and tea as well, but I don’t feel any crazy effect unless I drink a LOT. That being said, I don’t drink any on the weekends (unless she makes it Sunday morning for us both), and I feel absolutely no difference mentally or physically those two days off.

    • Technus

      same here! :-)

    • chloeholly

      I tried it for 3 months once. It was not unpleasant once I was over withdrawal, but it was boring. I like craving caffeine in the morning and then the ahhh feeling as I drink a cup.

  • Corsair4

    What about all that cream and sugar?

    That must cancel all the coffee benefits and maybe even make it worse I’m sure.

    Any studies on that?

    • gp65

      I think this study probably refers to drinking coffee black. I recall another video a while back on benefits of green tea where it was explicitly made clear that the benefits would be cancelled out if it was consumed with tea or sugar.

    • Joseph Gonzales R.D.

      That’s great point. There may be a questionnaire about how the subjects drank their coffee. I am sure we could pin it down by digging into the “sources cited” section and pulling the articles. I looked at the randomized trial on sleep, which stated” Coffee preparations: The two coffee preparations were either 3 g of regular instant coffee containing 90 mg of caffeine (Nescafé spécial filtre), or 3 g of decaffeinated instant coffee containing 4.5 mg of caffeine (Nescafé spécial filtre décaféiné, Nestlé, Vevey, Switzerland). The data on the caffeine content was provided by the manufacturer. The two coffee bags were equal in presentation and taste and were prepared in our pharmacy, observing strict quality controls. Each coffee bag had to be diluted in warm water (about 200 mL with or without milk and sugar). Subjects took one or other types of coffee, in a cross-over sequence defined by a list prepared by a colleague not participating in the study and working in the clinical pharmacology unit.”

      The findings were similar, so it appears the milk or sugar didn’t seem to matter in that study.

      gp65 has a good point. Cow’s milk may negate the healthful effects of green tea, but not plant-based milks.

    • gtrdoc911

      Great point. As a dentist I see many adults that consume lots of coffee with added sugar or honey. Many of them get lots of cavities from it. I always recommend to my patients that if they’re going to drink coffee or tea, don’t add any sugar or whiteners (which invariably contain lots of sugar).

  • newsjunkie

    I feel so relieved to see this. Just got back from Plant Stock with Dr. Esselstyn and others and he said no caffeine coffee but caffeine tea ok. glad to know i won’t drop dead from my caffeine coffee i so love.

    • Yvonne

      newsjunkie, What did he mean caffeine tea ok?

      • newsjunkie

        Dr Esselstyn told a small group of us who asked him about caffeine that after a talk with Dr. Gregor, decaf coffee and caffeinated tea is ok. He did NOT say caffeinated coffee is ok.

  • Lawrence

    Nice overview Dr G. Thanks for ‘stimulating’ my thinking about coffee this morning.
    User tip: try watching these videos at 0.5 speed to take in the information. Of course, there is also the transcript. Thanks NF team.

    If it weren’t for the antioxidants in coffee, many Americans would get precious little antioxidants at all:

    And, since it is likely to come up, I learned something today about ‘fair-trade’ coffee that kinda burst my bubble. Thought I’d pass it on:

    • Fred

      .5 speed makes Dr G sound like he NEEDS a really big cup of coffee…or a nap.

  • jCarol

    A very heartening report. Thank you, Dr. Greger for the straight scoop.

    After decaffeinating myself several times over the course of this lifetime and eventually returning to drinking coffee all day, I’ve found a happy medium. Completely avoiding leaded coffee makes me hyper-sensitive to even the smallest amounts of caffeine (e.g. a small amount of chocolate) causing my heart to pound. An unacceptable situation. Drinking coffee all day – as I did in my twenties – makes my (ahem) more seasoned heart race. Equally unacceptable.

    My Goldilocks “just right” solution? One or two cups of regular coffee before ten a.m. and herbal or decaf tea or (rarely) decaf coffee after that. No racing. If I have a little chocolate in the evening my body seems sufficiently desensitized to the caffeine so that my sleep is undisturbed. Note the word little.

    In the past 18 months I have given up dairy, meat, fish and almost all oil. Chocolate and wine are NOT on the table.

  • Kelly

    What effect does coffee have on the adrenal glands? Does this lead to increase in adrenal depletion/exhaustion and chronic fatigue?

    • Veganrunner

      Hi Kelly
      This is a really interesting topic. I hope Dr G can cover this. I have patients who see naturopaths and they are told they suffer from adrenal fatigue.

      • Adrenal insufficiency is a real medical condition. Adrenal fatigue is a pseudoscience sham.

      • sottolaw

        I’ve got a hunch that the endurance athletes who have suffered from adrenal fatigue all have one thing in common — heavy coffee/caffeine consumption. There have now been several examples of severe adrenal fatigue in the ultrarunning community, including two time Western States champion Geoff Roes.

    • Joseph Gonzales R.D.

      Dr. Greger mentions the adrenals in these videos. Here is an older study “Age and prior caffeine use alter the cardiovascular and adrenomedullary responses to oral caffeine” showing caffeine (2-3 cups of coffee) did not impact certain hormones. Another study found that “cigarette smoking and coffee consumption were related to high adrenaline excretion rates”

      There may be more, but I only found limited human trials. Other might have more to add. Thanks for posting your questions!

  • Adam Hefner

    So If I heard that right “low dose caffeine” is considered 5 cups or less? That seems like alot to me even if it’s 6oz or 8oz.

    Also the part about energy drinks doesnt make sense. If you look up most caffeine contents on the cans they will give you mg amount FROM ALL SOURCES. That includes the guarana, ginseng other stuff. And most of those (using Monster) are from 140-180 per 16 fluid oz can. Not saying they are healthy but i know some coffe drinks and lattes that are much higher than that

    • Wade Patton

      What does Ginseng have to do with caffeine?

      • Adam Hefner

        Sorry mentioned wrong source. Yerba

    • Joseph Gonzales R.D.

      Yes, the researchers in that study considered low-dose (less than 500 mg of caffeine).

      Good catch about energy drinks, they all vary in size and ingredients. I think the study was just saying if you drink 12 of them in a few hours, and each can has 3 grams of caffeine, that is like 36 grams (36,000 mg of caffeine) which is way to much. It makes 1-2 cups of morning java (100-200 mg of caffeine) look super innocent.

  • Misterimpatient

    I always have the same question after a presentation on coffee. Are the results the same for decaf? I drink about 32 ounces of coffee per day, made from about 15 grams of caffeinated coffee beans and 70 grams of decaf beans. Yes, I weigh my coffee beans. Is there something in the DSM for that?

  • David Johnson

    I have two questions:
    1. The effects of caffeinated vs decafe coffee (and tea) are not sorted out. What is the evidence that caffeine per se is beneficial?
    2. The discussion of atrial fibrillation states that caffeine does not increase risk of afib, but I was left wondering whether that conclusion refers only to initial incidence or also to subsequent incidence.

    • Darryl

      Caffeine functions as adenosine receptor antagonist (1), which may account for benefits in neurodenerative diseases (2), and it also inhibits mTOR (3, 4, 5, 6, NF videos), a growth regulatory protein central in aging and cancer research. Other compounds in coffee like the melanoidins produced during roasting potently elevate endogenous antioxidant responses and suppress inflammatory ones. (7, 8) which may be genoprotective (9). For what its worth, I drink 3-4 cups of caffeinated dark roast coffee daily, drip filtered through thick paper to remove the cholesterol elevating cafestol and kahweol.

      Unfortunately, the caffeine & afib meta-analysis excluded three studies of caffeine in patients with preexisting Afib, and my Scholar-fu isn’t up to finding those three. There’s study that suggests caffeine may reduce afib vulnerability in a predisposed animal model (10), but otherwise the evidence is scarce.

  • Strat Goodhue

    Since many people don’t drink enough liquids, could it be that the benefits of coffee drinking are really just from the drinking more liquids? Do the studies compare coffee and tea drinking to water or other liquids?

    • Joseph Gonzales R.D.

      I’m sure the studies control for many variables. You’d really have to read each one to see for sure. We have a great “sources cited” section by the video where you can pull the studies. Let me know if you cannot find something you’re looking for.

      Someone asked a similar question about if subjects were adding milk and sugar to the coffee, which I answered about further down in this thread.

  • Jim Felder

    Ok, ok, ok, tell me if you have heard this one before. How do you know if you have been drinking too much coffee? Your doctor tells you that you really need to be getting at least 8 hours of sleep and you think she means a week!

  • Carol Murphy

    Why should those with glaucoma or even a family history of glaucoma stay away from coffee?

  • Panchito

    Caffeine is not an stimulant. This is how it works

    ‘When caffeine molecules are blocking those receptors, they prevent this
    from occurring, thereby generating a sense of alertness and energy for a
    few hours. Additionally, some of the brain’s own natural stimulants
    (such as dopamine) work more effectively when the adenosine receptors
    are blocked, and all the surplus adenosine floating around in the brain
    cues the adrenal glands to secrete adrenaline, another stimulant.

    For this reason, caffeine isn’t technically a stimulant on its own”

    • Wade Patton

      Neato. One of the first things that I noticed when I started looking more closely at the effects of various drugs is that for very many of them (Rx and otherwise) the “mechanism of action” isn’t known. Glad we’re making some progress on that front.

      When I consume too much caffeine my sleep suffers. When I consume WAY too much caffeine I get acute lower back pain (presumed to be my kidneys). Did that three times as a young person. Learned not to. That was 30 years ago.

  • Robert Haile

    Starbucks and similar products both burnt and with added ingredients gives me GERD, but the pure coffee my friend produces in Costa Rica, ground just before making and with a paper filter, does not give me GERD which was a severe problem for me in the past. I once read a paper that indicated coffee made with a paper filter has a better impact on your lipid profile. Is this true?

    • Wade Patton

      Paper filters are supposed to help remove some “unwanted” component of coffee, but I forget which. I quit using paper filters long long ago when I switched to the French press. Now since reducing my intake I don’t even use the press. I just pour the water into the freshly ground (and often freshly roasted) beans, steep, and then pour through a strainer into the cup. My GERD was cured by WFPB diet. I was on PPI’s every single day for nearly two years. Now I’m completely off. Also someone gifted me a bag of Dunkin’ Donuts coffee once. It had an artificial ingredient. I didn’t make any of it. Even when eating SAD, I avoided artificials at every opportunity.

      Sweet Maria’s for great green beans (unroasted). Use an air-popper for roasting for frugality-there’s one in every yard sale. Lightly roasted African beans are awesome.

      • Info

        Paper filters remove oily components called diterpenes; these organic compounds, present in unfiltered coffee are known to be antimicrobial and antiinflammatory. Metal or nylon mesh filters do not remove these components.[1

        • Wade Patton

          Oh I see the problem: from wiki:_On July 8, 1908, the first paper coffee filter was created by German housewife Melitta Bentz. She wanted to remove the bitter taste caused by boiling loose grounds or using the typical method of linen to brew coffee.[2] _

          Boiling the grounds!

          I boil the water (sometimes not even a full boil) pour it into the grounds and NEVER add heat again unless using the microwave to reheat. This way it never goes “stale” in the pot, and there’s never any bitterness (which also comes from oxidized grounds/beans).

          I better go boil some water now.

  • vegank

    Great news for tea drinkers !
    Coffee seems to make me irritable after about 30 mins – 1 Hr, unfortunately,
    and Decaf gives me a severe migraine so that’s out as well.

  • As a clinician, although this study proves longevity, I have personally observed the relief my patients have once they are able to break their addiction to coffee. There are a lot of pro and con studies on coffee, but in general, I know through experience that it does more harm than good. What I want to see is a study on the quality of life coffee drinkers have compared to non-coffee drinkers. It’s not about just adding years to life you see, it’s more about adding life to those additional years. Quality as well as quantity. Stay healthy everyone!

    • Wade Patton

      I wonder if these patients were WFPB eaters as well? As I see it more _life_ and _years_ are added by eating WFPB than by any realistic beverage choices one makes. Stated othewise, the “battle” is the food, beverages are just skirmishes.

      • Charzie

        I am soooo in agreement! Most people are happy to share how good or bad this or that particular ingredient, “super food” or supplement is, while they remain totally oblivious to the big picture… a WFPB diet!

    • guest


    • dworthem

      I gave up coffee about 10 years ago and my experience is that I feel much better with a much more even energy and mental state throughout the day. I drank at most 3 or 4 cups a day. Also I each a plant based diet and have for about 15 years.

      Regarding the studies on the effect of coffee drinking on mortality or any of the other studies, it would be interesting to see studies comparing coffee drinkers and non-drinkers but who all have plant-based diets. I wonder if any benefits of coffee drinking are only compensating for other bad diet choices and are not present with a plant-based diet. This may be analogous that in Mediterrean style diets the bad effects of olive oil are somewhat compensated by the plant foods in that diet.

  • Cathy Katin-Grazzini

    Do we know whether the beneficial effects of coffee come from its polyphenols or caffeine?

  • I can not believe i just ran out of coffee, my wife’s got the car till Monday and my monthly report is due. So I have to survive 4 days without any means of making a cup a joe except possibly some remnant whitloof that wintered over out back…I am going to have to science the sh!t out of this!

    • Wade Patton

      Hitch a ride to the truck stop (ride a bike?), fill a thermos or two, and mete it out carefully to make it last.

      • Yeah man, hadn’t thought of that…the truck stop. Like in USAmerica right? trucks have to stop wheres. must have coffee. dig it. The Truck Stop. Cripes what a country.! Yep, i’m gon hitch a ride to the truck stop… hey, whats that light up there in the sky? I …I’m…whaa? get that probe outta…whaa….coffee? OK then, shoulda sed so freak.

  • Charzie

    It wasn’t really the coffee I was too concerned with since it’s limited in amount and never affects me, but it’s what else goes into it that can be problematic! Like that nasty non dairy creamer I am so guiltily still using, though just to lighten the plant milk a bit! My only unhealthy processed holdover I need to ditch!!! Anybody have a good alternative for someone who likes their coffee light, not sweet?

    • Lawrence

      Give hemp milk a try, if you have not already done so. I have used almond hemp milk in the past, and it was much nicer than almond or soy milk. Mixed really well without all that ‘wierdness’ of other plant milks (probably owing to its higher fat content), and had a smooth finish/mouthfeel similar to those nasty trans-fat creamers out there, but with none of the guilt.

    • Wade Patton

      Try some lighter roasts or roast it yourself to see if you can go to straight coffee. I’m glad I never developed the taste for additives and am amazed at how good super-fresh coffee can be. Adding other flavors would cover up the complexities.

    • jj

      “that nasty non dairy creamer” Nasty ingredients but sure tastes good. Rarely drink coffee anymore because I really like it with that nasty stuff in it. Specially the hazelnut creme.

    • Charzie, I’m old. I witnessed that whole change over from actual milk (remember when we’d ask “take cream?” and it was really just milk right? I came back to USA year by year and it was like the body snatchers for real…no more milk, no more 1/2n1/2…just this wierd “NON-DIARY CREMER” food like substance. My heart breaks for you…..OK fast forward to now. My Ann uses soymilk and it works quite great. it curdles in instant coffee (our national drink!), but it is good in fresh-brewed. Not so for you? myself, I remember my sainted, diabetic mother telling my young self, “learn to drink your coffee black and you won’t have to complicate things”. She was so wise. Other than black, coffee tastes like medicine to me.

  • Tom Goff

    Coffee raises cholesterol and increases inflammation. Use of paper filters reduces these increases but does not eliminate them. Tea is probably the safer option.

    • Just askin…Got any coffee over there Tom?

      • Tom Goff

        Yeah, I’ve even got a coffee maker and paper filters … but I don’t drink it every day.

        • Rhombopterix

          Are you, you know, makin any now? you dont look old enough

          • Tom Goff

            The photo’s a few months’ old now …..

          • Rhombopterix

            ahhh right..umm, it might could be stunting your, you know, development man…just sayin

          • Tom Goff

            It’s not stunting my development in that department: at least according to the little lady (she’s 4’11”). Her complaints run in the opposite direction. Of course, I’m originally a Brit and still drink tea by the gallon. Perhaps the tea’s the reason for my freakishly youthful looks and physical over-development (the ears I mean)?

          • Tom Goff

            As for “drinking coffee”, if you are in Oz or NZ, don’t you guys take your coffee with the sheep?

          • Rhombopterix

            Oh right the sheep, must get the sheep in there…dont forget the warm beer and cold women…oh wait thats your lot init?

          • Tom Goff

            Well, I live in Noosa but yes I’m a bloody pom. However, the beer’s cool and, as for the cold women, have you ever been to Ibiza? You know they say that the only good thing about Aussie beer is that it’s so cold it numbs the taste buds, and people can’t taste it?

          • Rhombopterix

            Come here ya big lug. Now about that coffee…

  • Rodrigo Cardoso

    Translated and published in Portuguese:

  • Rhombopterix

    City People: The whole world livin in th’ cities. Like on “Friends” or “Big Bang” and yet every time I read something ont he interverse its from regular people in homes and they have to mow a yard or take out the gar-beige…so i wonder how do you invisible city people get enough coffee?

    central perk? really? The way I figure it a big city has 1 X 10^7 people, half of whom drink 500 ml of coffee per day. Of course that is equal to the demi-planet Pluto’s worth of coffee, all squeezed through a pair of metaphysical dingo’s kidney’s the size of nTina Turner’s larnex…

    I’m sure youre understanding my confusal…I ran out of coffee a few hours ago and i walked to my neighbors a full kilometer away but they drink freakin tea!!!!! Had to smile and pretend to need milkin a goat or somethin

    I read about drones that deliver a pizza so i’m pretty sure if i had cell phone coverage but this is new zealand and we don’t have them where i live in the goddddddzzzzooonnned wopwops…but wait! Wazzat? I think i can hear a drone…maybe its carrying 200grams of Jed’s no. 3 whole bean….nope, just a chopper with a red stag…I’d bet anything theyve got a thurmus on deck.

    We got some chickory for Em’s boyfriend one time…i wonder where the heck they put that…if i mix some chickory and some dried poppy pods…lemon juice…cocoa…cardamom you say? Tom Waits:

    Nighthawks at the diner of Emma’s Forty-Niner
    There’s a rendezvous of strangers around the coffee urn tonight
    All the gypsy hacks and the insomniacs
    Now the paper’s been read, now the waitress said

    ‘Eggs and sausage and a side of toast
    Coffee and a roll, hash browns over easy
    Chile in a bowl with burgers and fries
    What kind of pie? Yeah…’

    It’s a graveyard charade, it’s a late shift masquerade
    And it’s two for a quarter, dime for a dance
    Woolworth’s rhinestone diamond earrings and a sideways glance
    Now the register rings, now the waitress sings

    Eggs and sausage and a side of toast
    Coffee and a roll, hash browns over easy
    Chile in a bowl with burgers and fries
    What kind of pie? Yeah

    Now well, the classified section offers no direction
    It’s a cold caffeine night within a nicotine cloud
    Now the touch of your fingers lingers burning in my memory
    I’ve been eighty-sixed from your scheme
    Now I’m in a melodramatic nocturnal scene
    Now I’m a refugee from a disconcerted affair
    Now the lead pipe morning falls, now the waitress calls

    ‘Eggs and sausage, another side of toast
    Coffee and a roll, hash browns over easy
    Chile in a bowl with burgers and fries
    Now what kind of pie?’

    À la mode if you will
    Just come in and join the crowd

    Cause I had some time to kill


    • Nighthawk! Dude! Come back into the kitchen. Ann’s got a syringe, its just coffee…just..coffe…stop…Ann now! There, there..better… init? there dude…good boy…good. yes, i said yes yes you will yes.

    • Wade Patton

      I’m glad the world is so full of city people, they keep the countryside from being overrun. Interverse, I’m borrowing that. 8-}

  • Rhombopterix

    I like that picture of the old woman. She’s seen so much, she just got to smile. Theres a pregnant profile of a lady who is gon have a baby in the reflection of her cup. Can you see her.

  • rumicat

    This all depends on the individual. The only way I routinely get healthy blood pressure readings is if I avoid caffeine and exercise regularly. Some people are more sensitive to the vasoconstrictuve effects of coffee.

  • Lucretia Witherington Shire

    when i worked as an RN in an emergency room in South Dakota – 2 x patients came in feeling anxiety and chest pain – – patients noted drinking a number of the high energy/caffeine drinks just a short time before symptom onset . . .

  • Manezi S.

    Fascinating video! Is there any literature linking caffeine/coffee consumption to tinnitus? Mine is pretty bad.

    • Wade Patton

      I’ve not found any and tinnitus is the one thing I don’t expect to cure with WFPB. Although I don’t get the “enhanced” ringing from taking NSAIDS (sometimes) any more because I simply don’t take NSAIDS as much as before.

      Also I’ve been on and off caffeine a few times in the last 20 years and never related it to more or less tinnitus. Funny thing is I can still hear better than most folks, just have an overlay of the ringing/buzzing/chirping (it varies).

      PLEASE let us know if you find some effective way to reduce tinnitus.

      • Manezi S.

        Interesting. The only thing I’ve found which definitely affects my tinnitus (other than loud sounds) is stress and alcohol. I have a suspicion that caffeine may somehow aggravate it but I can’t say for sure.

        Nowadays whenever I’m around noisy environments I carry a pair a 3M Clear EAR earplugs. They’re nearly invisible and work very well. Cheap too!

        • Wade Patton

          I wear earplugs for practically everything. Mowers, tractors, power tools, motorboats…etc

          • Manezi S.

            Good one! Tinnitus is one of those sneaky things that you don’t give much thought (at least I didn’t…) until you have a constant ringing in your ears.

  • Janelle Davidson

    I’ve been a china collector for twenty years. I know that for at least a century, china coffee cups were produced to hold eight ounces and tea cups to hold six ounces. Standard-sized tea pots held thirty-six ounces, thus six cups of tea. China demitasse cups meant for espresso hold three ounces. When ceramic mugs began being produced in the 1950s and 1960s, they were made of all sizes but tended to be a least nine ounces up to twelve and fourteen ounces.

  • Jo

    I also stopped coffee few years ago, and feel better – more “in control” without coffee. I wonder why the benefits of coffee has recently been promoted so much – maybe coffee producers are campaigning?; or there are many people who just cannot stop coffee, so, they can use a positive effect (vis-a-vis many negative ones) as an excuse.

  • Ian Su

    I’m in the middle of a 21 days no coffee challenge. Without that getting high from coffee, now I need to engage time consuming exercise like swimming or hot yoga to feel that energy and happiness. I also found the convenience of not having to p so much. 7 more days to go for my no coffee experiment. I’m also going to try using large quantity of tomato to get high.

    • Whats the result please?

      • Ian Su

        My results are awesome. Just 1 more hour, I complete my 21 days no coffee challenge. More stable energy. Better relaxation. Pure happiness from exercise and eating fruits. I think coffee, smokes, cancer inducing food… and all the good stuff in life better consume on special celebration.

  • Letha Hadady

    Various studies have linked caffeine consumption with reducing risk of Alzheimer’s. For example,

  • Ray Tajoma

    may be…. could be…..appears to be….It seems all the quotes studies are not definitive & useless – because it could also be the reverse.

  • Cold brewing coffee is said to greatly reduce the acidity content of coffee. It definitely has a very distinct, smooth flavor. I gave my plastic Walgreens cold brew set away recently, (and now am thinking I may have to find a new glass one!)

    However, research aside, I think many people may not realize how caffeine effects them until they give it up for a while, and then have a little. For the people who are quick to get irritated or anxious, too much coffee may be their foe, rather than their friend. That said, I’ve always loved a good, dark roast or shot of espresso here and there!

    • David

      I would be very interested in knowing what the actual benefits of Iced Brew Coffee are. I love the flavour and really enjoy my iced brew coffee. I too have been told that it is greatly reduced in acidity and also that because it is not heated, there are far less carcinogens.

  • Scot Lyf

    When I have a coffee sort of drink, I basically only ever haver the coffee chicory blend (New Orleans Blend), and only in a cup with about 2/3 of that brew(boiling hot), plus 1/3 whole non-homogenized milk(cold from the fridge). Together make the perfect temperature and food value balance. Powerful good, no jitters. I normally only have that when the weather is below 60F, and only as prudently desired, occasionally, more or less. No addiction. It’s very seasonal for me that I find it really hits the spot. Coffee I find too intense, too much caffeine, jitter production. I don’t drink sodas or other caffeinated beverages or foods, or anything of the sort, except maybe rarely or very rarely.

  • gary moore

    this has to do with exercise, Dr. Greger you recently mentioned that scientist had concluded one hour of exercise was the optimum amount jogging swimming etc but can that be 30 minutes in the morning and another 30 minutes later as long as your total is one hour.

  • 4Baccurate

    The drug study concluding that coffee does not cause atrial fib, is possibly suspect. I cannot have coffee for two (2) reasons: (a) I have arrhythmias on either coffee or tea, likely because of the caffeine content; (b) salicylate sensitivity. Perhaps people with a history of rheumatic fever or allergies may be more susceptible to arrhythmias caused by one or more chemicals in coffee and tea.

  • iffat jabeen

    many people told me that dont take enough tea or cofee it is harmfull for your kidney ,,is it correct plz guide me coz i have drink 4 or 6 cups in a day ????

    • Wade Patton

      Drink enough water to stay properly hydrated. Avoid processed foods. It depends on the size of your cup.

  • iffat jabeen

    cofee or tea is distroy our kidney ?????????

    • Wade Patton


  • Travis J Silberstorf

    So is it ok to drink a cup of regular organic coffee daily? With cate syrup?

  • Travis J Silberstorf

    Is it ok to drink a cup of coffee a day with date syrup?? Organic and plant milk

  • JunkFoodVegan

    Does coffee really causes hair to grey prematurely?

  • MatthewCiuccio

    Hi all, I love this and the other coffee videos. I started drinking coffee for the first time in my life, and i do not really like it i just consider it a health tonic :) My question when there studies say “coffee” that is very vague, how much coffee, of what kind etc was used. It is such a huge beverage. I try for 4 cups a day… but then, i was using what I thought was a cup 8oz, and I think coffee has another until for cup of coffee 5 or 6 oz. Confusing. Also how strong should the coffee be, I haven’t seen in the studies any description. Just curious if anyone knows.

    • Thea

      MathewCiuccio: I’m not a fan of coffee either. That’s why I was glad to see a NutritionFacts video that talks about “greens beating beans” ie, tea beating out coffee in some measure or other. I couldn’t find that specific video for you, but there is a good number of videos that talk about the health benefits of green tea, as well as some other teas. Here is the topic page on green tea, which has a nice summary of the information: I bring this to your attention in case you would be happier drinking tea over coffee.

  • bushin

    This is a terrific thread! Are there any studies related to coffee alternatives, such as Teeccino?

  • Chandlerart

    I generally only have one mug of coffee per day (and I don’t use dairy in it) and I’ve often wondered if I was causing any sort of risk to myself. My one question during this video tho, is about acid reflux. I USED to get it when I’d drink coffee, but that was when I was putting dairy in it. I’ve since changed to almond milk, and the acid reflux stopped. But in this video he said coffee can still cause it, but not tea, even tho the caffein content doesn’t change. So my question is… what is it in coffee that causes it then?

  • Dustin Gardiner

    Doesn’t black and green tea also contribute to acid reflux?

  • cami

    There is another video on this site that says that coffee can help with brain disorders. Now I am confused. Should I keep having my one cup of coffee a day or not?

  • mangot

    Hello Dr. Greger, I have a question for you.
    I was searching data about coffee and I found some likns to different meta-analysis that may shows that coffee could not be a healthy food. Could you please tell me what do you think about this? Here the links:
    2016, “Our meta-analysis results suggest that a high level of coffee consumption is a risk factor for gastric cancer.”
    Aug 2016, “Dose-response analysis indicated that every one-cup increase in coffee consumption was associated with an 1% increase in pancreatic cancer risk”
    2016 “higher maternal caffeine intake was associated with a higher risk of pregnancy loss and adherence to guidelines to avoid high caffeine intake during pregnancy appears prudent.”
    2016 “Dose-response analysis indicated that every one-cup increase in coffee consumption was associated with an 1% increase in pancreatic cancer risk. No statistically significant publication biases existed. Coffee consumption may weakly increase the risk of pancreatic cancer.”
    “Our meta-analysis results suggest that a high level of coffee consumption is a risk factor for gastric cancer”
    “detrimental association between maternal coffee consumption and childhood leukemia risk and provide indications for a similar role of maternal cola intake.”
    2015, “It indicated that coffee consumption was associated with the development of gastric cancer. More coffee drinking could result in the increased risk of gastric cancer.”
    2015, “Results of this meta-analysis suggested that there was an increased risk between coffee consumption and BC. Male coffee drinkers and non-smoking coffee drinkers were more likely to develop BC.”
    2015 “Our meta-analysis demonstrated that coffee consumption was not associated with overall gastric cancer risk; however, coffee consumption may be a risk factor for gastric cardia cancer.”
    2015 “high caffeine intake during pregnancy is associated with a significant increase in the risk of LBW, and this risk appears to increase linearly as caffeine intake increases.”
    2015 “Higher maternal caffeine intake during pregnancy was associated with a higher risk of delivering low birth weight infants. These findings support recommendations to restrict caffeine intake during pregnancy to low levels.”

  • SAReid

    Question: What is your opinion on “life-giving tea from a vine called Gynostemma pentaphyllum”, Below are the references from a digital flyer about increasing AMPK enzyme with it.
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    3. Bordone, L., Guarente, L. Calorie restriction, SIRT1 and metabolism: understanding longevity. Nat Rev Mol Cell Biol. 2005;6:298–305.
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  • I would love to hear your take on “bullet-proof coffee”.

  • Stephen

    Has this video been edited since it was first released? I recently retired my coffee press in favor of using a paper filter when I heard in one of Dr Greger’s videos mention there could be some health benefit by reducing the amount of oil/toxins by using a paper filter (compared to other coffee making methods). A friend ask me to forward the video but when I just listened the information is no longer there.

    Or do I have the wrong video? I know I recently listened to the video (within the past month or so) and that the video was brought to my attention via the daily email from NutritionFacts (so it was a new release at the time). My recollection was the video pointed out contradictory research results and the primary suspect of any negative health effect would be from the toxins in the oils released during brewing (that paper filters helped reduce).

    I’m shocked that I cannot go back and find the video where Dr. Gregor mentioned this information. HELP!!!

    • Thea

      Stephen: The search feature for posts is not working right now. I wonder if the page you are looking for is a post instead of a video, because I remember the same thing you do. I just can’t find it right now.
      Maybe someone else can jump in and find it. Or sometimes a google search will work where NutritionFacts search fails. You could try that. Good luck.

      • Stephen

        Hi Thea . . . thanks for your reply. I am positive I heard it in a videos and not read in print. TY for pointing out that the search feature isn’t working right now. I will try google as you suggest. The date on this video is August 19 2015 (when I posted my question yesterday I was mistaken thinking it was August 19 2016 so likely there may be a more recent video about coffee).

        • Emily3242

          This might be the video you were looking for as it mentions, “Even without creamer, though, lots of unfiltered coffee can raise cholesterol levels, but the cholesterol-raising compounds are trapped by the paper filter in brewed coffee, so filtered coffee is probably better.”

  • Stephen

    Has this video been edited since it was first released? I recently retired my coffee press in favor of using a paper filter when I heard in one of Dr Greger’s videos that there could be some health benefit by reducing the amount of oil/toxins by using a paper filter (compared to other coffee making methods). A friend ask me to forward the video but when I just listened the information is no longer there.

    Or do I have the wrong video? I know I recently listened to the video (within the past month or so) and that the video was brought to my attention via the daily email from NutritionFacts. But I cannot find any newer videos about coffee. My recollection was the video pointed out contradictory research results and the primary suspect in any negative health effects would be from the toxins in the oils released during brewing (that paper filters helped reduce).

    I’m shocked that I cannot go back and find the video where Dr. Gregor mentioned this information. HELP!!!

  • I would like to see a study on whole food plant based populations who drink vs don’t drink coffee. I’m willing to bet the non drinkers beat out the drinkers. The problem with these studies is there is a strong personal bias baked in as most people drink coffee and want to find ways to justify their bad habits. Caffeine is a drug and works the organs hard. The fact that some do better might have more to do with their diets lacking enough fiber, and coffee could play a role in moving things along – getting toxins out of the body quicker than they might otherwise come out.