Find Information About:

Drugs & Supplements

Get information and reviews on prescription drugs, over-the-counter medications, vitamins, and supplements. Search by name or medical condition.

Pill Identifier

Pill Identifier

Having trouble identifying your pills?

Enter the shape, color, or imprint of your prescription or OTC drug. Our pill identification tool will display pictures that you can compare to your pill.

Get Started
My Medicine

My Medicine

Save your medicine, check interactions, sign up for FDA alerts, create family profiles and more.

Get Started

WebMD Health Experts and Community

Talk to health experts and other people like you in WebMD's Communities. It's a safe forum where you can create or participate in support groups and discussions about health topics that interest you.

  • Second Opinion

    Second Opinion

    Read expert perspectives on popular health topics.

  • Community


    Connect with people like you, and get expert guidance on living a healthy life.

Got a health question? Get answers provided by leading organizations, doctors, and experts.

Get Answers

Sign up to receive WebMD's award-winning content delivered to your inbox.

Sign Up

Diabetes Health Center

Font Size

Caffeine Tied to Blood Sugar Problems

But Don't Be Too Quick to Blame Coffee, Say Researchers
WebMD Health News

Mar. 9, 2005 -- Caffeine can interfere with blood sugar.

But don't shelve your coffee mug just yet. Coffee might not be the culprit. In fact, it may offer some protection against diabetesit may offer some protection against diabetes, say researchers.

Sound confusing? The final verdict isn't in yet. Keep things simple by watching your caffeine intake from all sources. Besides coffee, caffeine is also found in some soft drinks, teas, and chocolate (in smaller amounts).

Caffeine's Buzz Is Common

Just about everyone has at least some caffeine every dayeveryone has at least some caffeine every day, and the numbers are rising for people aged 2-54 years.

Nearly 90% of U.S. adults and 76% of children have caffeine on a daily basis. Soft drinks are the top source for kids; for adults, coffee is No. 1, followed by soft drinks and teas. That's according to a study in January's Journal of the American Dietetic Association.

Checking nutritional labels doesn't always help. Food and drink makers don't have to list the amount of caffeine on the Nutrition Facts label.

Want to start tracking your caffeine? Here's how much caffeine is in popular drinks:

  • Coffee (8 ounces, brewed): about 135 mg
  • Caffeinated tea (8 ounces): about 50 mg
  • Coca-Cola (12 ounces): about 34.5 mg
  • Diet Coke (12 ounces): 46.5 mg

Charting Caffeine's Effects

Participants included 23 white men. Eight were lean, seven were obese and had type 2 diabetes, and eight were obese but did not have diabetes.

They drank up to 5 cups a day of coffee or tea, with two men favoring decaffeinated versions.

The men were then put through a test to determine the men's insulin sensitivity.insulin sensitivity. This is a measure of how well the body is responding to insulin, the hormone that controls blood sugar. If insulin sensitivity is decreased, blood sugar levels can rise. This is a sign that someone either has or is at increased risk of having diabetes.

Prior to the test the men were given either caffeine tablets equal to 2 to 3 cups of coffee or a placebo.

Today on WebMD

Diabetic tools
Symptoms, diagnosis, treatment, and more.
woman flexing muscles
10 strength training exercises.
Blood sugar test
12 practical tips.
Tom Hanks
Stars living with type 1 or type 2.
kenneth fujioka, md
Can Vinegar Treat Diabetes
Middle aged person
jennie brand miller

Prediabetes How to Prevent Type 2 Diabetes
type 2 diabetes
food fitness planner