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Does Black Coffee Affect Blood Sugar


Drinking Coffee When You Have Diabetes

Does coffee raise blood sugar?

Diabetes is a condition that causes blood sugar levels that are higher than normal and the body cant properly create and use insulin.

  • With type 1 diabetes, the body doesnt produce insulin. This is a hormone that helps glucose go from the bloodstream into the cells of the body.
  • With type 2 diabetes, which is most common, the body doesnt produce insulin properly.

Diabetes can be controlled through proper diet, exercise, and medication or insulin that is prescribed by a healthcare provider.

Another type of diabetes is gestational diabetes. This can start when a womans body is not able to make and use all the insulin that it needs for the pregnancy. This diagnosis doesnt mean that a patient had diabetes prior to pregnancy or a diagnosis will happen after conception. Gestational diabetes can be a temporary condition.

The best way to manage diabetes is through diet, exercise, and creating a plan with your healthcare provider to keep your blood sugar controlled.


Although caffeine may help reduce the risk of diabetes, for those who have diabetes, it could create an issue. Studies show that caffeine can impair glucose tolerance and decrease insulin sensitivity.

Randomized Controlled Trials In Healthy Volunteers

  • Rob M. van Dam, PHD,
  • Wilrike J. Pasman, PHD and
  • Petra Verhoef, PHD
  • 1Department of Nutrition and Health, Faculty of Earth and Life Sciences, Vrije Universiteit, Amsterdam, the Netherlands
  • 2Physiological Sciences Department, TNO Nutrition and Food Research, Zeist, the Netherlands
  • 3Wageningen Center for Food Sciences, Nutrition and Health Program, Wageningen, the Netherlands
  • 4Division of Human Nutrition, Wageningen University and Research Center, Wageningen, the Netherlands
  • Address correspondence and reprint requests to Dr. R.M. van Dam, Department of Nutrition and Health, Faculty of Earth and Life Sciences, Vrije Universiteit Amsterdam, de Boelelaan 1085, 1081 HV Amsterdam, Netherlands. E-mail: rob.van.damfalw.vu.nl
  • How Does Caffeine Affect Your Blood Sugar

    A growing body of research suggests people with type 2 diabetes react to caffeine differently. It can raise blood sugar and insulin levels for those with the disease.

    One study looked at people with type 2 diabetes who took a 250-milligram caffeine pill at breakfast and another at lunchtime. Thatâs about the same amount as drinking two cups of coffee with each meal. The result: Their blood sugar was 8% higher than on days when they didnât have caffeine. Their reading also jumped by more after each meal.

    Thatâs because caffeine can affect how your body responds to insulin, the hormone that allows sugar to enter your cells and get changed into energy.

    Caffeine may lower your insulin sensitivity. That means your cells donât react to the hormone by as much as they once did. They donât absorb as much sugar from your blood after you eat or drink. This causes your body to make more insulin, so you have higher levels after meals.


    If you have type 2 diabetes, your body already doesnât use insulin well. After meals, your blood sugar rises higher than normal. Caffeine may make it tougher to bring it down to a healthy point. This may lead to too-high blood sugar levels. Over time, this may raise your chance of diabetes complications, like nerve damage or heart disease.

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    Other Factors That Contribute To Higher Blood Sugars

    The caffeine content in coffee is not the only thing to blame for higher blood sugar levels, however. Many people prefer coffee first thing in the morning, right when theyre often already experiencing the higher blood sugars associated with the dawn phenomenon, and combining the two can make it harder to get levels back under control.

    Additionally, beware of added sugars, syrups, and sweetened-dairy products that can quickly add empty calories to your morning brew. The difference in carbohydrate counts between one cup of black coffee and a Grande Frappuccino from Starbucks is stark and can make all the difference between a good blood sugar day and a difficult one. Having coffee beverages that are high in saturated fat and sugar on a regular basis can contribute to both insulin resistance and the development of type 2 diabetes.

    Even an innocuous latte can still have anywhere between 12-25 grams of carbohydrates, simply from the sugars found in milk.


    Does Adding Cream And Sugar Affect Blood Sugar

    Does Black Coffee Affect Blood Sugar?

    All of the above studies are based on black coffee or caffeine supplements without adding cream or sugar. Small amounts of cream likely won’t impact blood sugar because it’s primarily fat and has a low glycemic response. But adding sugar to coffee can spike your blood sugar, so it could be even more of a problem in combination with the short-term drops in insulin sensitivity.

    So what can you add instead of sugar? There are a few natural sweetener options, including:

    You want to skip artificial sweeteners like aspartame or sucralose because some studies suggest they can negatively affect blood sugar regulation.

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    Is Coffee Safe If I Have Diabetes

    Although the evidence on coffee benefits is mixed, as long as you keep an eye on your blood sugar and stick to coffee with less sugar, drinking coffee should be safe. You can treat coffee like any other food, watching how much sugar you add and making sure you limit your caffeine consumption to reasonable amounts. Below are some things to keep in mind.


    Does Decaf Coffee Raise Blood Sugar

    Most of the impact coffee has on blood sugar levels comes from caffeine, but one study showed an acute rise in blood sugar after drinking decaffeinated coffee. The study concludes that drinking decaffeinated coffee increases blood sugar levels in the short term but to a lesser extent than drinking caffeinated coffee.

    Drinking both regular and decaf coffee can actually help lower a persons risk of developing diabetes in the long term. The short-term spike in blood sugar seems to be a transient effect and doesnt change the fact that drinking coffee can reduce the risk of developing diabetes.

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    Does Coffee Affect Blood Glucose And Insulin

    Plain coffee does not seem to directly increase levels of blood sugar, or blood glucose. This is good news for people with diabetes who like black coffee.


    However, some research suggests that the caffeine in coffee could impair insulin sensitivity, which is not ideal for people with diabetes.

    That said, other compounds in coffee notably magnesium, chromium, and polyphenols may play a role in improving insulin sensitivity, which may offset the effects of caffeine.

    Because of this, some experts suggest that people with diabetes drink decaffeinated coffee to get the benefits of components such as antioxidants and minerals without affecting insulin sensitivity.

    Caffeine is the major stimulant in coffee. It occurs naturally in coffee beans and green tea. Caffeine speeds up the central nervous system and may increase mental alertness, relieve tiredness, and improve concentration.

    In the general population, the Food and Drug Administration report, 400 milligrams of caffeine or 4 to 5 cups of coffee per day usually have no negative effects.


    However, because research in people with diabetes has been mixed, it is a good idea to ask a healthcare provider about how much coffee is safe.

    Some people are more sensitive to the effects of caffeine than others. This is true for people with or without diabetes.

    Espresso In Other Coffee

    Does coffee raise blood sugar?

    Since espresso shots are a popular base for mixed coffee drinks, let’s focus on those for a minute. With so many variables at play , it can be challenging to know how each type will impact your glucose. For example, a cappuccino is an espresso mixed into a cup of foamed milk, then topped with anything from cocoa powder and cinnamon to a range of other toppings.

    A simple cappuccino made with plain milk and no added sugar provides around 160 milligrams of caffeine and 50-70 calories. It also has a lower glycemic index, around 35. Milk contains both protein and fat, which can slow digestion and allow for a more gradual glucose curve for most people. Any added sugars or flavorings could contribute to a larger glucose and insulin response.

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    Can I Drink Coffee When I Have Diabetes

    For many of us, drinking a cup of hot brewed coffee is a daily morning ritual. But do coffee and diabetes go together? The answer is yes, but its important to be aware of how coffee impacts your disease.

    The jurys still out on exactly how coffee affects diabetes because the research is somewhat conflicting. Some studies point to coffee increasing insulin sensitivity and other data shows that it doesnt. Your genetic makeup has something to do with how coffee will affect your diabetes as well. Certain genes may metabolize coffee differently, which can improve your blood sugar levels or make them worse.

    Changing Your Morning Routine

    Researchers say there are plenty of things that can trigger a rough night in bed. From insomnia, to a noisy neighbor, to a new baby, many things can cause one night of fragmented sleep. The team recommends finding a better way to balance the need for stimulants with the energy from a healthy breakfast.

    The study notes this can be especially hard for people who enjoy the most popular drink in the world. The population consumes around two billion cups each day.

    There is a lot more we need to learn about the effects of sleep on our metabolism, such as how much sleep disruption is necessary to impair our metabolism and what some of the longer-term implications of this are, as well as how exercise, for instance, could help to counter some of this, lead researcher Harry Smith says.


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    This Is Your Fasted Body On Coffee

    Does coffee break my fast? This is one of the questions we get most frequently from our readers and LIFE Fasting Tracker users. The simplest answer is, probably not. In fact, coffee may boost many of the physiological impacts of fasting.

    But because all of us here are into exploring, tracking and measuring the impacts of our lifestyles and interventions like intermittent fasting on our bodies and our health, lets dive deeper into this story of coffee and fasting. Because the real answer to Does coffee break my fast? is, as always, more complicated than yes or no!

    Have questions about coffee and fasting that we havent covered here? Well be responding to your questions LIVE on Facebook Messenger from 10AM 1PM Central US time on Weds, May 22nd. to pre-register for our Coffee AMA and be notified when it starts!

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    Coffee And Possible Prevention Of Diabetes

    Regular Caffeine Consumption  From Coffee, Cola, or Energy Drinks ...

    The health advantages of black coffee for diabetes varies from person to person. It was found that individuals who increased their coffee consumption by above 1 cup each day had an 11% reduced risk of developing diabetes type 2. On the other hand, individuals who lowered their coffee consumption by 1 cup each day enhanced their risk of developing diabetes by 17%. There was no variance in people having tea. Its not evident why black coffee has such an influence on the progression of diabetes.

    Thinking caffeine? It might not be accountable for those good benefits. In actual fact, caffeine has been found to enhance both insulin and sugar levels in the short term. In a research study involving males, decaffeinated coffee presented a short-term rise in blood glucose level. There are limited studies and more research requires to be performed on the effects of diabetes and caffeine.

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    So What Should You Do

    • If caffeine is part of your current routine, either in your morning coffee or before a workout, be aware that it is likely decreasing your acute insulin sensitivity. Try not to pair it with high-carb meals.
    • Given that the apparent benefits of long-term coffee consumption appear to outweigh the short-term effects , you probably dont need to cut it out.
    • Switching to decaf appears to offer many of the same benefits but with a lesser short-term effect than regular coffee.
    • If youre not a coffee person, dont start drinking coffee just for the long-term metabolic benefits. You can get the same beneficial chlorogenic acids through several fruits and vegetables, including apples, artichokes, carrots, and tomatoes. Drinking green tea also appears to have long-term positive effects.
    • Remember to avoid adding sugar or artificial sweeteners to your coffee, and skip the sugary energy drinks.

    Does The Amount Of Caffeine Matter

    Don’t start loading up on coffee to lower your blood glucose levels. Your response to caffeine will also depend on your baseline blood glucose level, how much caffeine you consume, genetics, and how your body handles caffeine. Most healthy people can safely consume up to 400 mg of caffeine per day without adverse side effects.

    One thing to consider is that your response may depend on more than just CGAs. Recent studies suggest the difference in your glucose response may stem from your genetic makeup, with specific genes linked to your rate of caffeine metabolism. For some, this could mean they metabolize coffee quicker, resulting in more dramatic glycemic responses from the same amount of caffeine.


    Before you decide what a healthy level looks like for you, the best thing to do is to experiment and pay attention to your threshold to figure out how much caffeine is appropriate for your daily limit. Even if you’re healthy, it’s a good idea to consume caffeine in moderation and find what amount is right for you. Remember that, like everything else, caffeine has its side effects and risks. It can lead to headaches, restlessness, and anxiety. Certain types of coffee, like unfiltered coffee, can lead to an increase in cholesterol, and there may also be an increase in your risk of things like heartburn. And, of course, if you’re loading up on the cream, milk, and sweetener, too, you may be putting yourself at risk of diabetes.

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