Read this next...

Coffee and Diabetes

Caffeine (found in coffee) has been shown to impair insulin sensitivity
Caffeine (found in coffee) has been shown to impair insulin sensitivity

The effect of coffee on diabetes, when presented in the media can often be confusing.

News stories can in the same week tout the benefits coffee can have on diabetes and shoot down coffee as being unhelpful for blood sugar levels.

This doesn’t mean the articles are contradictory though.

Put slightly more simply, coffee contains different chemicals, some of which have beneficial effects whereas others can have a less beneficial effect, such as caffeine which can impair insulin in the short term.

Caffeine and blood sugar levels

Regular high caffeine consumption, over a 4 week period, has been shown to impair insulin sensitivity in people with type 2 diabetes. [20]

Whilst the researchers found a relationship between higher coffee consumption and lower sensitivity to insulin, they recognised that the rapid transition to having more coffee may have produced an atypical or emphasised response by the body.

Benefits of coffee

Coffee has been shown to lower risks of the following conditions:

  • Type 2 diabetes
  • Cancer - such as endometrial cancer and aggressive prostate cancer
  • Cardiovascular disease
  • Strokes
  • Alzheimer's disease
  • Parkinson's disease

Coffee contains polyphenols, which are a molecule that anti-oxidant properties which are widely believed to help prevent inflammatory illnesses, such as type 2 diabetes, and anticarcinogenic (anti-cancer) properties.

As well as polyphenols, coffee contains the mineral magnesium and chromium. Greater magnesium intake has been linked with lower rates of type 2 diabetes.

The blend of these nutrients can be helpful for improving insulin sensitivity, which may help to offset the opposite effects of caffeine.

Coffee and prevention of diabetes

Coffee and its effect on risks of developing type 2 diabetes have been studied a number of times and has indicated a notably lower risk of type 2 diabetes being associated with coffee drinkers.

A 2009 study of 40,000 participants noted that consumption of 3 cups of tea or coffee a day lead to a 40% lower risk of type 2 diabetes developing. [21]

A study of healthcare professionals in the US and UK, published in 2014, showed that those that increased their consumption of coffee experienced an 11% decrease in risk of type 2 diabetes over the next 4 years.

Decaffeinated coffee and blood glucose

So whilst caffeine may hamper insulin sensitivity, other properties in coffee have the opposite effect.

It is therefore believed that decaffeinated coffee may present the best option for people with diabetes as researchers find it includes the benefits of coffee with some of negative effects that are associated with caffeine.

Lattes and syrups in coffee

Some varieties of coffee need to be approached with caution by those of us with diabetes. Coffees with syrup have become a much more popular variety of coffee within the 21st Century but could be problematic for people either with, or at risk of, diabetes.

If you have diabetes, or are at risk of diabetes, it is advisable to reduce your exposure to too much sugar. If you wish to enjoy a syrupy coffee from time to time, pick the smaller sized cups and drink slowly to better appreciate the taste without dramatically raising your blood glucose levels.

Another modern trend in coffee is in the popularity of lattes, very milky coffees. Lattes present two considerations: the number of calories in the latte and the amount of carbohydrate in them.

Whilst skinny lattes are usually made with skimmed milk, some of them may be sweetened which will raise their calories. Milk, whether full fat or skimmed, tends to have around 5g of carbs per 100g. A regular, unsweetened skinny latte can typically contain anywhere between 10 and 15g of carbohydrate.

Your Comments
@Philip Robinson: No no. I'm not saying don't drink decaf coffee :D. I'm saying that by fact it raises your LDL cholesterol... So don't think it's a wonder drink... Treat it with the same respect you would with usual coffee... in moderation.@Geoff Oliver: I really don't know the answer to your question. My apologies.
Posted by James Trusler, England on Wednesday, June 13, 2012
But can we mention that Decaf coffee raises LDL cholesterol. So don't drown your sorrows in the stuff.
Posted by James Trusler, England on Thursday, February 02, 2012
This is complete garbage. Since Britons have been drinking large quantities of tea and coffee since the 19th century, if this was true then we would have a low incidence of diabetes, heart problems and cancer. We don't, we have average levels, or in the case of T2, higher levels. It's a case of pseudo scientific nonsense pedalled by journalists.
Posted by Philip Robinson, United Kingdom on Thursday, February 02, 2012
Interesting re coffee - does this apply to just proper coffee or instant as well?
Posted by Geoff Oliver, Rural wales on Thursday, February 02, 2012
Have Your Say
This is my Diabetes Forum username
Your Comment* (1000 characters max)
Your email address will not be published. Your comments may be moderated. By submitting your comments, you agree to the Diabetes Community Rules.

Join us