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How much caffeine is too much caffeine?

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It only takes about 200 milligrams of caffeine to affect your blood sugar. That’s the amount in about one or two cups of brewed coffee or three or four cups of black tea. You may be able to handle more or less caffeine. People can have different reactions to the drug. Your response depends on things like your age and weight.

SOURCES:

FDA: “Medicines in My Home: Caffeine and Your Body.”

Diabetes Care : “Acute Effects of Decaffeinated Coffee and the Major Coffee Components Chlorogenic Acid and Trigonelline on Glucose Tolerance,” “Caffeine: A Cause of Insulin Resistance?” “Caffeine Can Decrease Insulin Sensitivity in Humans,” “Caffeine Increases Ambulatory Glucose and Postprandial Responses in Coffee Drinkers With Type 2 Diabetes,” “Coffee, Caffeine, and Type 2 Diabetes.”

Mayo Clinic: “Caffeine Content for Coffee, Tea, Soda and More,” “Caffeine: Does It Affect Blood Sugar?” “Diabetes: Complications,” “Nutrition and Healthy Eating.”

Joslin Diabetes Center: “What Is Insulin Resistance?”

American Diabetes Association: “Type 2.”

Sacha Uelmen, director of nutrition, American Diabetes Association.

Journal of Clinical Investigation : “Epinephrine-induced Insulin Resistance in Man.”

Nature Review Endocrinology : “Adenosine signalling in diabetes mellitus -- pathophysiology and therapeutic considerations.”

Annals of Internal Medicine : “Impaired Insulin Signaling in Human Adipocytes After Experimental Sleep Restriction: A Randomized, Crossover Study.”

European Journal of Clinical Nutrition : “The Evaluation of Inflammatory and Oxidative Stress Biomarkers on Coffee -- Diabetes Association: Results From the 10-year Follow-up of The ATTICA Study (2002–2012).”

Reviewed by Michael Dansinger on April 13, 2017

SOURCES:

FDA: “Medicines in My Home: Caffeine and Your Body.”

Diabetes Care : “Acute Effects of Decaffeinated Coffee and the Major Coffee Components Chlorogenic Acid and Trigonelline on Glucose Tolerance,” “Caffeine: A Cause of Insulin Resistance?” “Caffeine Can Decrease Insulin Sensitivity in Humans,” “Caffeine Increases Ambulatory Glucose and Postprandial Responses in Coffee Drinkers With Type 2 Diabetes,” “Coffee, Caffeine, and Type 2 Diabetes.”

Mayo Clinic: “Caffeine Content for Coffee, Tea, Soda and More,” “Caffeine: Does It Affect Blood Sugar?” “Diabetes: Complications,” “Nutrition and Healthy Eating.”

Joslin Diabetes Center: “What Is Insulin Resistance?”

American Diabetes Association: “Type 2.”

Sacha Uelmen, director of nutrition, American Diabetes Association.

Journal of Clinical Investigation : “Epinephrine-induced Insulin Resistance in Man.”

Nature Review Endocrinology : “Adenosine signalling in diabetes mellitus -- pathophysiology and therapeutic considerations.”

Annals of Internal Medicine : “Impaired Insulin Signaling in Human Adipocytes After Experimental Sleep Restriction: A Randomized, Crossover Study.”

European Journal of Clinical Nutrition : “The Evaluation of Inflammatory and Oxidative Stress Biomarkers on Coffee -- Diabetes Association: Results From the 10-year Follow-up of The ATTICA Study (2002–2012).”

Reviewed by Michael Dansinger on April 13, 2017

NEXT QUESTION:

What should someone do to see if caffeine raises their blood sugar?

WAS THIS ANSWER HELPFUL

THIS TOOL DOES NOT PROVIDE MEDICAL ADVICE. It is intended for general informational purposes only and does not address individual circumstances. It is not a substitute for professional medical advice, diagnosis or treatment and should not be relied on to make decisions about your health. Never ignore professional medical advice in seeking treatment because of something you have read on the WebMD Site. If you think you may have a medical emergency, immediately call your doctor or dial 911.

    This tool does not provide medical advice. See additional information.

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