Increasing daily coffee consumption may reduce type 2 diabetes risk

April 25, 2014

People who increased the amount of coffee they drank each day by more than one cup over a four-year period had a 11% lower risk for type 2 diabetes than those who made no changes to their coffee consumption, according to a new study led by Harvard School of Public Health (HSPH) researchers. In addition, the study found that those who decreased their coffee consumption by more than a cup per day increased their type 2 diabetes risk by 17%.

“Our findings confirm those of previous studies that showed that higher coffee consumption was associated with lower type 2 diabetes risk,” said Shilpa Bhupathiraju, lead author and research fellow in the Department of Nutrition at HSPH. “Most importantly, they provide new evidence that changes in coffee consumption habit can affect type 2 diabetes risk in a relatively short period of time.”

The study appears online Thursday, April 24, 2014 in Diabetologia (the journal of the European Association for the Study of Diabetes).

The researchers analyzed data on caffeinated and decaffeinated coffee, and caffeinated tea consumption from 48,464 women in the Brigham and Women’s Hospital-based Nurses’ Health Study (1986-2006), 47,510 women in Nurses’ Health Study II (1991-2007), and 27,759 men in the Health Professionals Follow-up Study (1986-2006). Participants’ diets were evaluated every four years with a questionnaire, and those who self-reported type 2 diabetes filled out additional questionnaires. A total of 7,269 cases of type 2 diabetes were documented.

Results showed that participants who increased their coffee consumption by more than one cup per day (median change=1.69 cups/day) over a four-year period had a 11% lower risk of type 2 diabetes in the subsequent four years compared to those who made no changes in consumption. (A cup of coffee was defined as eight ounces, black, or with a small amount of milk and/or sugar.) Those who lowered their daily coffee consumption by more than one cup (median change=2 cups/day) had a 17% higher risk for diabetes. Changes in decaffeinated coffee consumption and caffeinated tea consumption were not associated with changes in risk for type 2 diabetes.

“These findings further demonstrate that, for most people, coffee may have health benefits,” said Frank Hu, senior author and professor of nutrition and epidemiology at HSPH. “But coffee is only one of many factors that influence diabetes risk. More importantly, individuals should watch their weight and be physically active.”

Increasing daily coffee consumption may reduce type 2 diabetes risk

54 Responses to Increasing daily coffee consumption may reduce type 2 diabetes risk

  1. u14081017 May 5, 2014 at 3:15 am #

    As an avid coffee lover,coffee is morning elixir to me it gives me an early jump-start for the day.I am always told how unhealthy coffee is because whenever there is a chance I will make myself a warm cup of coffee,I guess that is just a mere myth.

    Studies shows that 3 cups a coffee a day is the maximum one person can take in.Coffee is quite the treat for a lot of people,I wonder if too much of sugar and milk contribute to the amount of coffee I should take per day.I am very grateful to know that decaffeinated coffee and caffeinated tea had no effect on the diabetes risk.I am very interested in what happens on a molecular level in coffee that leads to this decreased risk for type 2 diabetes.

    In my studies I have learnt that coffee consumption is associated with a decreased risk of type 2 diabetes.Suggested mechanisms underlying the association have included attenuation of subclinical inflammation and a reduction in oxidative stress.Coffee consumption led to an increase in coffee-derived compounds,mainly serum caffeine,chlorogenic acid,and caffeic acid metabolites.Coffee consumption appears to have beneficial effects on subclinical inflammation and HDL cholesterol,whereas no changes in glucose metabolism were found in my study.Futhermore,many coffee-derived metabolism methylxanthines and caffeic acid metabolites appear to be useful as biomarkers of coffee intake.

    Although there was a lower risk of diabetes among decaffeinated coffee drinkers,increasing or decreasing consumption made no difference.Whats interesting is that when you are a diabetic,you are told to avoid coffee because it raises your blood sugars-the very definition of what diabetes is.

  2. 14253284 May 4, 2014 at 2:19 pm #

    I truly want to believe this article because I normally drink more than 4 cups of coffee every day but this article is not reliable for me sadly. They didn’t mention about other external factors. Diabete is also affected by exercising amount, sugar consumption, life-style, etc.
    If this article was the experiment which all the sample people have the same condition of living and the food, and also exercise. Then it would be reliable.
    Also, what I wanted to know when I was reading article is that how many cups of coffee is the best for the day but it didn’t mention the maximum cups of coffee which can make the body healthier. There would be a someone who would think lots of coffee is good so drink more than 6~7 cups a day but I’m sure that too much is even worse than nothing. If this article mentioned about the best caffein intake amount, then I would drink as possible as that amount even if it’s false.
    In addition, I want to know how the coffee consumption may reduce diabetes risk. If this is mentioned then this article would be fully reliable but this article didn’t mention about how. Also, this article talks about ‘how to make a good coffee for diabetes’ but it’s not really well emphasized for me so I want to recommend the writer about changing font, or giving a different colour to give emphasize about the amount of sugar and milk, because too much sugar will destroy diabete sufferers’ body function.

  3. Duncan 14008671 May 3, 2014 at 10:52 am #

    Not to sound cynical but when a desired outcome is really wanted it is easy to “manipulate” certain conditions to fall into the favour of the desired outcome. Based only on this article there are a few points that I believe adumbrate why this article can not be taken directly as true. Firstly the definition of coffee as given by the article, “A cup of coffee was defined as eight ounces, black, or with a small amount of milk and/or sugar
    Read more at” There are a few problems that arise with this statement alone, firstly two different people will not have the same perspective as to what a “small amount” is. When stating a definition of one of the main variables the definition can not be this vague, the findings will be based on the definition and when the definition is flimsy or open to interpretation then it can not be used, science strives on being accurate with everything. By not having a full very specific definition there is always going t be room for error and misinterpretations to enter the equation. The second main problem with this definition is that it only states eight ounces. Talk to any coffee fanatic and they will tell you that two different types of coffee are not the same, lets take a simple example, Frisco and Nescafé Gold. Frisco has more Chicory than actual coffee, so what does this say? According to the definition, “coffee” that is made out of something that is not pure coffee beans is coffee. Now where does leave us? Evidence that was gathered has been based on too free a definition. Thus showing that the definition is flawed already.

    Another problem is the all the external factors that will play a role in the equation. There is no mention of lifestyle choices and how they may increase or decrease the chances of getting type 2 diabetes. Obese people have a higher chance of getting diabetes, whilst people who try follow healthy diets have a much lower chance of getting diabetes. There are many things that can cause diabetes in people, and some of these reasons lets say hereditary diabetes, where diabetes runs in the blood line and it’s possible for a person who belongs to this blood line can also stand in line to have diabetes, and no amount of coffee can refute the genes that have been in our bodies our entire lives, so there are parts that were not fully explored, furthermore there is an outrageous lack of what the experiment took as “test dummies. The test could have been run on people who would have had a very little chance of getting diabetes, or people who are so close to having type two diabetic. The could have been told to change their diet by the physicians to by who ever, so even something as simple as that can have disastrous affects on the final outcome.

    I truly am a lover of all things coffee, some might even say I’m a coffee snob, so I would love for this notion to be true as much as the next person as this would justify having more coffee every day, but as I said in they article there is not enough information for us to even begin to accept what has been stated as true. For a future experiment to be successful, more things have to be unified, a specific type of coffee must be defined as the only coffee for the test and secondly different lifestyle choices must be incorporated and the findings must be adumbrated and explained with relevance to each group of people… That way we can see where coffee is the most effective with the test subjects. But non the less if we choose to ignore the “fine print” this article gives us the justification we need to be drinking the amount of coffee we usually do without having to feel bad about it afterwards!

  4. JK Descoins (12066631) May 3, 2014 at 4:34 am #

    I feel that this experiment is highly dependable on external factors, and although this experiment proves that coffee may be beneficial to your health, these external factors may not have been considered. For example, one person may prefer their coffee with no milk and one sugar, another may prefer their coffee with cream and 5 sugars, the latter being far more susceptible to contracting diabetes if they were to increase their coffee consumption, thereby also increasing their sugar consumption. Although the experiment states that one coffee would be taken with a little milk and sugar, realistically this would not apply to a diverse group of people who have different preferences and tastes. Increasing the daily amount of coffee may be beneficial in the long-run, however, there are many other short-term and long-term effects which do not benefit the body. Coffee is a diuretic substance, and the amount of times that one urinates increases and this leads to dehydration a lot of times. Coffee, which is essentially used for its caffeine, can be addictive. Coffee is linked to insomnia and poor sleeping patterns. Caffeine has also been linked to an increase in high-blood pressure and hypertension, incontinence, as well as various studies which have suggested that caffeine is linked to a 27% increase in infertility. Although this article proves one long-term benefit of increasing ones daily coffee consumption, the other short-term and long-term harmful effects should rather be taken into consideration when deciding whether or not to increase ones coffee consumption.

  5. Nicole (14012287) May 3, 2014 at 3:36 am #

    This is an interesting discovery but I feel like it could be quite an odd one. Coffee has been found to lower risk for diabetes but there are also health risks involved in coffee consumptions especially in high quantities. This study shows that about 2 cups may reduce risk for diabetes but some people may feel that if they use it excessively their risk for diabetes may be even less. This may cause adverse side effects due to excessive consumption such as anxiety and even heart problems. Some studies have shown that unfiltered coffee has potential risk for high cholesterol, however more studies need to be done to show this. The fact that coffee may decrease risk for diabetes is a promising discovery but I feel more research should be done the effects of increasing coffee consumption and pros and cons should be weighed out to determine whether increasing coffee consumption is more beneficial or more harmful to an individual.

  6. Nicole May 3, 2014 at 2:02 am #

    This is an interesting discovery but I feel like it could be quite an odd one. Coffee has been found to lower risk for diabetes but there are also health risks involved in coffee consumptions especially in high quantities. This study shows that about 2 cups may reduce risk for diabetes but some people may feel that if they use it excessively their risk for diabetes may be even less. This may cause adverse side effects due to excessive consumption such as anxiety and even heart problems. Some studies have shown that unfiltered coffee has potential risk for high cholesterol, however more studies need to be done to show this. The fact that coffee may decrease risk for diabetes is a promising discovery but I feel more research should be done the effects of increasing coffee consumption and pros and cons should be weighed out to determine whether increasing coffee consumption is more beneficial or more harmful to an individual.

  7. Nicole ( 14018960 ) May 2, 2014 at 2:11 pm #

    If something sounds too good to be true it is most probably too good to be true . I agree with Karlien too much of something can not be good either. How caffeine affects the blood pressure is not fully known. Some people say that it blocks a hormone that keeps your arteries open and other speculate that the increase of your blood pressure is because the caffeine causes the adrenal glands to release more adrenaline. I think people who regularly drink caffeinated beverages develop some sort of tolerance to it because there are no long term effect on their blood pressure, were as stronger blood pressure increasing effects is to be expected on people who does not drink caffeine regularly. Most of the side effects caused by caffeine like sleeping problems , stomach ulcers , irregular heart rhythms , chronic headaches and high blood pressure are more likely seen by people who does not drink caffeine regularly. I think at this stage with more medical based research too be done by scientist and doctors will later lead to a more detailed answer on how and if caffeine could or could not lower your chances of type two diabetics. Here is a link for more on the side effects and tips too keep in mind:

  8. 04530765 May 2, 2014 at 1:06 pm #

    As a coffee lover, I find this to be exciting news. In addition I have several diabetics in my family and knowing that coffee may reduce type 2 diabetes risk is rather reassuring.

    The article does not clearly state whether or not caffeine is the cause for the findings, however, it is probable that it is a contributing factor. In addition research done by the Harvard School of Public Health has found that caffeine has other benefits such helping to prevent diseases like stroke and certain cancers and lowering the risk of Parkinson’s and dementia. Thus it might not be such a stretch to assume that caffeine is the cause for lowering the risk of type 2 diabetes. Although, it is worth noting that the article mentions that a change in caffeinated tea consumption was not associated with changes in risk for type 2 diabetes. Perhaps the levels of caffeine in the tea were too low to have an effect.

    In response to Letlhogonolo 14065224’s comment, the article mentioned that a cup of coffee was defined as “eight ounces, black, or with a small amount of milk and/or sugar” so the amount of sugar is not the issue here.

    It’s reassuring to know that my three cups of coffee a day might actually benefit me in some medical way, besides just tasting amazing. As with most things in life, moderation is key so if you stick to below 300mg of caffeine a day the effects of coffee are likely to only be beneficial.

  9. Letlhogonolo 14065224 May 2, 2014 at 9:07 am #

    I absolutely beg to differ with what has been said. i find it weird for a cup of tea to reduce the risk of diabetes type 2. why? simply because when you drink coffee, it is your choice to put in as many spoons of sugar as you want. thus i find it somehow contradictory. since type two is determined by our lifestyles, i believe maybe caffeine would work on its own and not neccesarily in a cup of tea.

    I am diabetic, but with type 1.I do drink coffee but believe me even if i use canderel, the blood sugar goes up.

  10. u14057507 May 2, 2014 at 7:58 am #

    Caffeine has so many adverse effects on the body that it almost negates its use in decreasing the risk of type 2 diabetes. I have read that Caffeine contains a large amount of chemicals including polycylic aromatic hydrocarbons(carcinogens). Because it contains aldehydes and sulphides it can be taxing on your liver and kidneys to remove it. Caffeine can also reduce the effectiveness of your prescription drugs. It fights against your immune system and can turn it against you resulting in Auto immune disease which is responsible for Lupus, Rheumatoid Arthritis and muscular dystrophy and fibromyalgia.
    Needless to say caffeine raises dopamine levels and can become highly addictive. It has an adverse accumulative long term effect. As the study points out, there are other factors that decrease the risk of type 2 Diabetes. I feel that losing weight, increasing activity, not smoking, eating correctly and controlling meal portions and regular monitoring, will be more beneficial in every way to the body without increasing the risks of other diseases as an increase in caffeine intake is likely to do.

  11. Karlien 14020514 May 2, 2014 at 5:51 am #

    Coffee is quite the treat for a lot of people. To know that there could be benefits to drink a cup or two more will definitely make them very happy!

    The thing they should keep in mind is that there is always something as too much. There is also the other factors like amounts of sugar and milk.

    It would be interesting to know exactly how it works to help prevent type 2 diabetes. What is it in the caffeine that could have such a variety of side-effects but yet something else could be prevented… It is a mystery!

    But how does this caffeine intake affect the rest of the body and a person’s health? It might reduce the risk of type 2 diabetes but at what cost would that be?

  12. 14047099 May 2, 2014 at 2:20 am #

    This article is very interesting and relatable since coffee is such a big part of our society, even for those of us who don’t drink it. We constantly see, smell and hear about coffee.
    Considering the health benefits of drinking coffee it is very hard to generalize since everyone takes their coffee differently. People who take more sugar in their coffee increase their risks for type 2 diabetes, negating the coffee’s effect of decreasing it. like 14068720 I am also interested in what happens on a molecular level in coffee that leads to this decreased risk for type 2 diabetes. I disagree with 14111561 on that the caffeine doesn’t have an effect. This does not seem to be the case as the article states that decaffeinated coffee and caffeinated tea had no effect on the diabetes risk. This implies that the caffeine only has an effect on the coffee. Perhaps it has something to do with the interaction between caffeine and other substances found in coffee.

  13. Rochelle - 14032211 May 2, 2014 at 1:21 am #

    In today’s world, many people rely on caffeine to get them through the day. In my case – I’m a huge coffee lover. In the morning, the afternoon, just before bed, whenever there is a chance I’ll make myself a warm cup of coffee. I’ve done some research in the past about the effects that too much caffeine has on a person’s health. Things like difficulty sleeping, headaches and anxiety popped up. But these “side effects” can easily be treated, and besides, I never had any of those problems. So my opinion is that we can still enjoy a cup of coffee or two a day, just don’t overdo it. Studies shows that 3 cups a coffee a day is the maximum one person can take in. And then, the fact that coffee reduces the risk of type 2 diabetes is also a plus! “To me, the smell of fresh-made coffee is one of the greatest inventions”, Hugh Jackman – I’m sure all the coffee lovers would agree.

  14. Nadia (14021162) May 2, 2014 at 12:44 am #

    I for one am a great lover of all things coffee. I believe coffee can have some great benefits if used in moderation. “Too much of a good thing” they say. I have reaped some of the benefits of (my excessive) coffee consumption over the years. I have more energy available to me after a good cup of coffee and I also read that it somewhat prevents your eyesight from deteriorating in another post. Here is the link :
    All in all I will continue to enjoy my coffee consumption and reap the benefits it has to offer.

  15. 14111561 May 1, 2014 at 11:22 pm #

    This article is quite interesting because as a kid I was always told of how unhealthy coffee is, guess that was just a mere myth then. To think coffee could potentially hold some important health benefits (depending, as stated above, on consumption) is quite mind blowing – makes me think that students nowadays might not actually be so bad off in terms health, especially concerning type 2 diabetes. The fact that it ISN’T to do with the caffeine in coffee makes me wonder, what it could be then that provides this let’s say health benefit? Could this factor that reduces type 2 diabetes risk in coffee be harvested/collected somehow and put into the former of medication to accommodate people who aren’t coffee drinkers but run a risk of obtaining diabetes due to family history? Important questions I’d think for type 2 diabetes potentials.

  16. 14031681 May 1, 2014 at 9:52 am #

    Everything about coffee is exceptional, the smell, the taste, even the look of it. It is good to hear that coffee has its advantages as well. However, just like everything it is important to take the amount of consumption into account. Everyone must also remember that fitness and a good healthy diet is also important for a decreased risk of diabetes ‘type 2′. One can’t assume that extra coffee will cancel the effect of unhealthy food intake. Other than that it is very interesting and good to hear.

  17. u14002338 May 1, 2014 at 4:09 am #

    As an avid coffee lover, I found this article to be very interesting. Coffee is addictive. Most students on campus can’t go through the day without a cup. I think everything should be done in moderation. Coffee has positives and negatives we shouldn’t be too dependent it. I was always told to believe coffee is only bad for you. Coffee increases stress and insulin levels therefore leaving you feeling tried. In my personal experience I tried to cut out coffee and replace it with apples as a “wake me up” in the mornings, personally I didn’t feel apples are a good substitute. The study, in the article, shows that coffee is not all bad for you, if the test subjects increased their daily coffee intake they decreased their risk for type 2 diabetes. When the test subjects tried alternative caffeine products, their risk for typed 2 diabetes increased significantly. I will definitely keep drinking coffee.

  18. u13103629 May 1, 2014 at 2:37 am #

    Coffee has so many up sides, but I feel more downsides. I am a chronic coffee drinker and it is right beside impossible for me to give it up! It doesn’t necessarily wake me up, but I do feel more able to function with a mug of coffee at my side early mornings or late nights. It is a hug in a cup. I have seen that the effects of caffeine depends on the consumer. Some people are jumping the walls after one cup of coffee while others, like me, can drink a whole pot before bedtime and still sleep soundly. I feel about this piece of science and proof the same way as about dark chocolate decreasing your chance of having a heart attack, it is such a small percentage considering other factors that it almost doesn’t matter. But it sure does help me conscience when having my one cup way to many a day!

  19. Neo 14003016 April 30, 2014 at 12:16 pm #

    People respond to different stimuli in different manners. Coffee consumption can be the same issue too.

    Some people could drink but one cup and be kept up all night, while others could drink a whole pot and still feel nothing at all. A number of factors influence how each individual reacts to caffeine consumption. With light of that, the benefits of drinking coffee to reduce diabetes could prove helpful for some, not all.

    Body weight, age and hereditary factors influence how each individuals body reacts to this stimuli, and it can vary from individual to individual.

  20. u14006473 April 30, 2014 at 7:15 am #

    I love coffee and drink it daily, it makes me feel awake in the mornings. I am glad to see that, according to studies done by the highly acclaimed Harvard School of Public Health, it lowers your risk of type 2 diabetes. Now I won’t feel guilty every time I drink it. Although there might be some health disadvantages of drinking coffee, the advantages overshadow them. coffee should me enjoyed in moderate consumption.

  21. 13162625 April 30, 2014 at 6:08 am #

    After years of drinking coffee my doctor told me that coffee is bad for my heart and she ordered me to stop drinking it. stubbornly i went against her orders, to my surprise i nearly died (okay maybe not die die but i had difficulties breathing). So although coffee is proven beneficial but it still does have high risks. Should we now take a a lot of coffee for it’s benefits or a little coffee or (as my doctor said) no coffee at all? are it”s benefits worth it’s risks?

  22. 14107334 April 30, 2014 at 5:38 am #

    It is interesting how the amount of coffee you drink per day is actually related to the increase or decrease of type 2 diabetes, and as you increase the intake the risk decreases, however the risks of increasing coffee intake are drastic as you are actually increasing chances of heart attacks, sleeping problems and other related effects and coffee can be addictive too. lets not make change over one benefit that will bring us problems because at the end, the problems will obviously obscure the benefit. Best solution can be to avoid it or not be a regular even though research shows that it can lead to an increase in the risk of type 2 diabetes if you decrease your intake of coffee

  23. Liberty.M(14198593) April 30, 2014 at 4:18 am #

    I’m at risk of getting diabetes since two of my family members are suffering from type 2 diabetes and coffee is one of the diet which I do not usually take. Since I received this interesting information about coffee I will start to take coffee regularly and also advice some of my family members to do the same to reduce the risk of getting diabetes.Everyone need to get this message so as to reduce the spreading of this disease which has a devastating effect to the human communities. Coffee should not be a scarce commodity and the access to it all over the world should be easy.

  24. Nomonde (13344260) April 30, 2014 at 2:54 am #

    coffee makes me feel weak every time i drink it and i am worried if it will not lead to a permanent bad condition yet i am also at a risk of diabetes since my family has a lot of people with it

  25. 13344260 April 30, 2014 at 2:37 am #

    i don’t really like coffee but with these benefits i will save myself from diabetes especially because i have a high risk of getting since ma family has a lot of people with it. but am also worried if it doesn’t lead to other diseases because after I’ve drank it i feel week

  26. 13344260 April 30, 2014 at 2:28 am #

    i do not like coffee but with these benefits i will just find a way to save myself from diabetes. i’m worried though just as Raeesa is if this doesn’t trigger other health conditions because after I’ve drank it i just feel feel week.

  27. u14048192 April 30, 2014 at 1:10 am #

    Diabetes is one of the fastest growing, life threatening diseases affecting the world today. To think coffee can help lower the risk is “mind-boggeling”. Drinking more coffee lowers the risk, drinking less coffee ups the risk, but what if someone does not drink coffee at all? Would this lower, up or have no effect on the risk? If a family is prone to diabetes and its members don’t drink coffee, should they begin drinking more than four cups a day? Coming from a varsity, students love coffee, the coffee shops continually have customers. Could this be said that varsities with busy coffee shops should in theory have lower diabetes percentages?

  28. Michelle (13035526) April 29, 2014 at 11:04 am #

    There are many things to take into consideration when suggesting an increase in coffee intake. It has been proven that coffee reduces the risk of diabetes, but what other effects could two cups of coffee a day have on you? On the one hand coffee has many antioxidants that can speed up metabolism, help one concentrate more, decrease the risk of Alzheimer’s and cancer, and decrease the amount of inflammation that the body experiences. However coffee needs to be had in moderation and the effects experienced depend on the individual. Some people experience nervous twitches, they find that it disturbs their sleep; it can cause some heart damage and can even cause ulcers. Everyone needs to experience how coffee affects them personally. The hard part comes when people need to find a balance to how much coffee they are drinking. How do you know if it is too much or too little? I personally love my coffee, and have reached my own conclusions that the benefits of drinking coffee outweigh the disadvantages. Perhaps people should do more research on this though. Will it be possible to isolate the specific part in coffee that reduces these risks? How can one tell whether they are having enough coffee to receive all the benefits while making sure that it’s not too much?

  29. Nadia (14022380) April 29, 2014 at 10:05 am #

    Can coffee have benefits? Yes, researchers found that the intake of coffee on a daily basis can reduce the risks of type 2 diabetes. The research also shown that people who lowered their daily coffee intake has a 17% higher risk for type 2 diabetes.
    In my opinion I still think that coffee is a bad habit, and a risk for your health. Although research has shown that coffee reduces the risk of diabetes, they haven’t confirmed or indicated why coffee reduces your risk, so, is this research trustworthy enough?

  30. Raeesa (14114501) April 29, 2014 at 9:07 am #

    I am aware that diabetes is one of the fastest growing, life-threatening, non-communicable diseases affecting South African’s, especially since my family members are affected.
    Being a coffee lover and at risk of developing type 2 diabetes, this article highlighted the benefits of increasing the intake of caffeinated coffee over a four- year period and lowering the risk as compared to reducing the intake and increasing the risk.

    However, Is there a total health benefit? yes, caffeine reduces the risk of diabetes, but how certain are we that this increased intake of caffeine, doesn’t trigger and lead to other conditions?

  31. 14068720 April 29, 2014 at 8:17 am #

    This finding is quite contradictory to what people might think would be the effect of an increases coffee intake. I would like to know what happens on a particulate level. How does coffee decrease the risk of diabetes? Would it be advisable to suggest coffee as a way to prevent diabetes to people running a risk of contracting diabetes? If there is some chemical substance in the coffee itself that lowers the risk of becoming a diabetic, would it be possible to extract that substance and concentrate it as a substance for prevention? I do hope someone is doing further research and testing on this subject, as it might lead to a better insight of the disease.

  32. Lebohang (13381042) April 29, 2014 at 7:37 am #

    Wow this is interesting!…I love coffee with all my heart and i have always knew that coffee is not good for my health so i had to limit the cups of coffee i have per day, but after reading this, my thoughts about coffee have changed. I now know that increasing my consumption of coffee by one cup could lower the chances of having type 2 diabetes by 11%.

  33. 14098352 April 29, 2014 at 6:52 am #

    wow that’s interesting! i always avoided high intake of coffee because of its disadvantages. Now that it has a good health benefit, i will increase the intake with no worries. But what are the intake limitations though?

  34. Aphiwe (13230078) April 29, 2014 at 6:31 am #

    I’m a coffee addict, the taste of coffe just never gets old for me. And I’ve awlways been told how coffee is bad for and my health but its actually refreshing to see that coffee is not so bad for me. Now I can enjoy my cup knowing that there are benefits to it all.

  35. Joost April 29, 2014 at 5:00 am #

    Caffein increases the heart rate and metabolic rate in humans. In short : Your body will burn more calories at rest with coffee than it does without coffee and your heart will beat faster. This is a bad thing if you have heart problems.

    Diabetes type II is correlated with large spikes in blood sugar. The higher metabolic rate might blunt out some of the blood sugar spikes.

    A lot of people used to use ephedra and other stimulants to boost their metabolism in order to lose weight. Coffee is a stimulant too, but less potent.

    I think I can envision a causation in this situation.

  36. Bertus Beetge (14113245) April 29, 2014 at 3:50 am #

    I don’t know if I completely agree with this study, it was my understanding that diabetes type 2 is strongly linked to an unhealthy lifestyle.

    Drinking coffee is essentially an addiction and if stopped, like smoking, needs to be replaced by something else. Which is most commonly other food substances also rich in sugar and carbohydrates, thus leading in a possible increase the risk for diabetes type 2 .
    It doesn’t really makes sense that drinking more coffee reduces the risk as many people drink lots of milk and sugar with their coffee,which is in essence also rich in carbohydrates and sugar. Caffeine could be healthy, but in moderation.

  37. HM Oosthuizen (14053952) April 29, 2014 at 2:25 am #

    According to research and this blog, coffee reduces the chance of developing diabetes 2.

    Although there seems to be a link between coffee intake and risk of developing diabetes, clear evidence on what excatly in the coffee is responsible for this, is not yet available. Researchers believe that it might be the antioxidants and other nutrients in coffee that is responsible for this. However, if clear evidence is not stated thus far, can it then be stated as a fact that increasing your coffee intake will reduce your chance of developinfg diabetes?

    Although there might be a correlation between these two, increasing your coffee intake should not be seen as the “Golden Route” to preventing diabetes.

    Better ways to prevent diabetes is to control your weight, eat healthier and excersize regularly. Also quit smoking and drink less alcohol.
    By doing this, you will not only lower your chance of developing diabetes, but also lower your chance of developing high blood pressure, high cholesterol and having a heart attack or a stroke. You will live a overall healthier life.

  38. u14003563 April 29, 2014 at 1:04 am #

    Coffee, that morning elixir, may give us an early jump-start to the day, but numerous have shown that it also may be protective against Type 2 Diabetes. Yet, no one has really understood why. High coffee consumption has been associated with better glucose tolerance and a substantially lower risk of Type 2 Diabetes in diverse populations. However, it remains unclear what coffee components may be responsible for the apparent beneficial effect of coffee on glucose metabolism. Short-term metabolic studies in humans have shown that caffeine can acutely lower insulin sensitivity.

  39. u14102367 April 28, 2014 at 5:11 am #

    Although coffee has the advantage to reduce the risk of type 2 Diabetes, it has serious disadvantages too. Drinking coffee on an empty stomach can stimulate the production of Hydrochloric acid.This can be a problem because HCl should only be produced to digest meals. If your body has to make HCl more often in response to regular cups of coffee, it may have difficulty producing enough to deal with a large meal.
    Various acids found in coffee beans can irritate the stomach and lining of the small intestine. This can pose a problem for people suffering with ulcers, gastritis, IBS and Crohn’s disease and doctors generally advise patients with these conditions to avoid coffee completely. Irritation of the lining of the small intestine can potentially lead to abdominal spasms, cramps and elimination problems, a condition known as irritable bowl syndrome.

  40. u14064635 (Urvishi Baba) April 28, 2014 at 4:28 am #

    Diabetes is a condition that occurs when a human’s body can’t use the glucose normally. The glucose is the main energy source in humans and the glucose level is controlled by the hormone insulin. In type 2 diabetes the human body can’t respond to the insulin that is made by the pancreas.

    Being a person living with type 2 diabetes for a couple of years. This piece of information is extremely helpful yet I disagree with this article, as I was always told having coffee is not good for one’s health. Living with diabetes is not easy, I always have to watch what I eat or drink and how much I eat or drink. Drinking coffee may not help me reduce my risk of having diabetes, since I already have diabetes, but I can change my lifestyle to accommodate my illness.

    We often are told that the caffeine in coffee is a dehydrating agent, thus meaning that the caffeine will draw a lot of the body’s water out. As well as one of the symptom of diabetes being polyuria( frequent urination), this will have a negative effect on one’s health. There are many other symptoms; such as polydipsia, polyphagia and weight loss.

    The life expectancy of a diabetic is a ten-year-shorter expectancy then a normal, healthy person. Due to the complications associated with diabetes there is a two to four times risks of cardiovascular disease which includes having a heart attack and stroke. If one experience tremors, change in sleeping patterns, stressed or, uncomfortable, their coffee consumption is too much.

    In conclusion coffee will only do more harm than good. If you want to improve your health, it’s better to focus on other lifestyle factors, such as increasing your physical activity, quitting smoking, eating more whole grains, or stop drinking so much coffee.

  41. A.J van Zyl (14003482) April 28, 2014 at 3:41 am #

    This article was an interesting read as I used to be an avid coffee drinker. One always hears about the negative effects of coffee which had me searching for a substitute with more health benefits. I am happy to say I’ve found it: green tea. Many would disagree as its taste is not as heavenly as that of coffee. On researching some positive effects of coffee, I found that aside from its ability to lower ones risk of type 2 diabetes, it also contains antioxidants, improves physical performance and raises metabolic rate. However, since its my goal to expand the fan base of green tea, I have to add that this lovely yellowish drink can lower ones risk of high cholesterol and blood pressure, heart disease, esophageal cancer, Alzheimer’s, Parkinson’s and…diabetes! It also contains more antioxidants than coffee and can be used for weight control as it increases metabolism. Coffee can make one jittery, whereas green tea contains theanine which has a calming effect that minimizes stress and improves concentration. I must admit that I still drink coffee but trade in that second or third cup for a cup of green tea. This has allowed me to lower my sugar intake drastically, which has many benefits on its own.

  42. Adam Kuca April 28, 2014 at 2:46 am #

    Everybody enjoys their morning cup of coffee. It is a fact that coffee is not one of the most healthiest substances in the world and this article assists in proving at least one of the benefits of coffee. As other bloggers have mentioned below, overuse can lead to addiction and other unwanted symptoms due to over-consumption of caffeine, but how often is that seen in the real world? It all boils down to how well you understand your body and its ability to function with certain levels of, let’s say caffeine. It is therefore in the best interests of common folk that people moderate their intake. Personally, having relatives with Diabetes type 2, I have seen the hassle of the everyday insulin user and it is not the most pleasant disorder to have. If drinking coffee will assist in preventing the risk of getting Diabetes Type 2, then i certainly will continue using it in moderation under my own terms.

  43. 14038502 - Karla Watson April 28, 2014 at 12:49 am #

    It is refreshing to discover that coffee does not only effect its drinkers negatively but also has some positive effects on their health. However, increasing your daily intake of coffee may decrease the risk of you developing type 2 diabetes but it can increase the risk of developing heart disease, arthritis and increase your chances of having a stroke. Yes the idea that coffee can decrease your chances of developing one disease is a good thing, but should we just ignore the fact that it puts us at risk for other diseases as well? As Vivek commented, “Is it worth the risk?” Moderation is key here, if we level out our caffeine intake then we neither decrease our risk nor do we increase our risk of being affected, we remain neutral to the harmful side effects of coffee addiction. There are alternatives to lowering the risk of type 2 diabetes that should be considered before coffee.

  44. Lerissa14158397 April 27, 2014 at 10:42 pm #

    Growing up you are always taught hat too much caffeine will have negative side effects. This study demonstrates the advantages of caffeine, which is rarely spoken about. However even though caffeine can decrease the risk of type 2 diabetes there are other factors which contribute to getting diabetes type 2. Therefore a person can not only eat foods which contain a lot of sugars and then drink cups of coffee and expect not to get diabetes type 2. The coffee only decreases the risk. But in response to other commenters with the sugar intake : surely the researchers of Harvard School of Public Health knowing that diabetes type 2 is the affected person resists insulin, they would have taken the sugar intake into consideration. However one must not forget that caffeine is a drug and the addiction to caffeine will have other side effects.

  45. Esmarie (u14002711) April 27, 2014 at 10:36 pm #

    I am convinced that I am not the only person who depends on that essential cup of strong coffee to get me through my long nights of studying. The above mentioned diminishes the guilty feeling I usually have when preparing that late night energy booster. With a 17% decrease in the chance of suffering from Diabetes 2, it seems as if I do not have to give up my caffeine addiction for some other sickly sweet energy drink. I however, agree that there are ways of decreasing the risk for Diabetes 2, other than caffeine which contains health compromising factors. According to, harmful effects of caffeine might include early death, hypertension, gout and insomnia. The methods of decreasing the risk of Diabetes 2 mentioned by Natasha could thus be the healthier alternative.

  46. Kelsey(u14053749) April 27, 2014 at 10:20 pm #

    It is indeed enlightening to find that coffee has some benefits after all the detrimental effects we have heard about coffee. I believe finding to be true , although I think that everything in life needs a balance .So as many of you have commented suggesting that you would rather not increase your daily in take of coffee so as to prevent addiction to caffeine.I think we cannot completely rule out the fact that increased levels of coffee prevent type 2 diabetes,however I do think that everything should be done in moderation.So one should increase intake amount of coffee to a maximum of two cups a day to prevent addiction but still receive the benefits of prevention of type 2 diabetes.

  47. Nthateng Tsotetsi(14066506) April 27, 2014 at 2:11 pm #

    This is highly impressive, even though caffeine may be a disadvantage to consumption of coffee, I believe that the other two compounds that make up coffee ( caffeic acid and chlorogenic acid) are highly sufficient for reducing type 2 diabetes because they inhibit the formation of the toxic hIAPP ( human Islet amyloid polypeptide) hence they protect the pancreatic cells.
    Good news is, a decaffeinated coffee works even much better.

  48. Natasha(14044082) April 27, 2014 at 4:01 am #

    In this article they mentioned that you should increase your coffee consumption by more than one cup daily to decrease type 2 diabetes. But by decreasing the risk of type 2 diabetes your actually increasing the risk of addiction to caffeine (coffee). Because caffeine is seen as a drug, it can lead to physical dependence. Now how can this be beneficial to our long term health? A typical cup of coffee can contain up to 100 mg of caffeine, while consuming more than 500 mg per day can lead to addiction.(Now consider your daily coffee consumption?) I would rather consider alternatives for reducing type 2 Diabetes, like eliminating consumption of white bread or white pasta products, or increasing exercising activities.

  49. Jeremy (14082935) April 27, 2014 at 1:52 am #

    Since my start in tertiary education I have started drinking coffee very often in order to give me energy for the day. However since I’ve been drinking it I’ve always been reminded how bad it is for you and how its a bad source of energy. After reading this blog I feel more convinced now to drink coffee as not only does caffeine have negative attributes but can also be positive as been said above that it can reduce Type 2 diabetes.
    However I’m not entirely convinced as drinking coffee more often can mean having double the amount of sugar that you usual have which is one of the main causes of Type 2 diabetes.

  50. 14021880- Michelle Morgan April 27, 2014 at 1:45 am #

    Research on the effects of coffee in the long run on humans have increased quite rapidly over the last couple of years. A lot of positive findings have been found on the long-run effects of coffee intake . For example, it has been found that 4 cups of coffee a day can even prevent Alzheimers. It’s amazing how coffee can prevent or help decrease the chances of contracting big illnesses or diseases such as diabetes.

  51. Patricio Francisco (u14263272) April 27, 2014 at 12:20 am #

    We have always been told that coffee is classified as a stimulant, and that coffee in high amounts is not at all beneficial to ones health. Some have even gone on to say that coffee causes the type 2 diabetes condition to get worse. So, it’s interesting to read that this is not the case, and that coffee in fact decreases your chance of getting type 2 diabetes, as backed-up by the research. However, surely there must be a limit to how many cups of coffee we’re allowed to drink. How much is considered to be too much?

  52. Vivek (14080070) April 27, 2014 at 12:16 am #

    This article gave me a shock about the influence of coffee on diabetes. I was always told that drinking coffee is not one of the best options and so I never drank it. Coffee seems to have its benefits but what worries me is the result over time. We have to increase our intake of coffee over a certain period of time i.e. 4 years in order to avoid diabetes which we were less likely prone to in the first place before starting to drink coffee. Some disadvantages of drinking too much coffee is the dependence on it to function normally, being jittery and dehydrated to name a few. I agree there are advantages to drinking coffee but is it worth the risk?

  53. Botsang 14168015 April 26, 2014 at 1:59 pm #

    As caffeine is most commonly absorbed in coffee or other tea products and like we were told that caffeine is bad for ones health in such a way that it may cause heart attack….it’s relieving to find out that it does also have a good effect on one’s health.

  54. 14121418 April 26, 2014 at 11:50 am #

    I never knew coffee had its advantages. I always thought caffeine is bad for people

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