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WCRF/AICR
Global Network

AICR Health Talk

Karen Collins, MS, RDN, CDN, FAND
American Institute for Cancer Research

Q: Do I need more water when I drink coffee so I don’t get dehydrated?

A: Drinking water throughout the day is an excellent habit but you don’t need extra because you drink coffee. Research now shows that moderate amounts of coffee, whether regular or decaf, contribute to keeping your body hydrated. The small diuretic effect from the caffeine is more than counter-balanced by the fluid we get as we drink coffee.

In two recent studies in men, coffee did not differ from tea, a sports drink, sugary cola, diet cola, or plain water in how it affects signs of water loss over a few hours or days. Studies showing little or no dehydrating effect of coffee usually involve amounts of caffeine in two or three eight-ounce cups of coffee (250 to 300 milligrams). Given these findings, there’s no reason to expect having more coffee would cause dehydration problems.

Moderate coffee consumption, three to five cups a day, is linked to lower risk of type 2 diabetes and AICR’s latest reports found that coffee links to lower risk for endometrial and liver cancers. The concern, then, is simply to avoid amounts of coffee that lead to sleep disturbance or individual health issues.

Learn more about coffee in AICR's Foods that Fight Cancer.


The American Institute for Cancer Research (AICR) is the cancer charity that fosters research on the relationship of nutrition, physical activity and weight management to cancer risk, interprets the scientific literature and educates the public about the results. It has contributed over $105 million for innovative research conducted at universities, hospitals and research centers across the country. AICR has published two landmark reports that interpret the accumulated research in the field, and is committed to a process of continuous review. AICR also provides a wide range of educational programs to help millions of Americans learn to make dietary changes for lower cancer risk. AICR is a member of the World Cancer Research Fund International (WCRF).

Published on 05/02/2016

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