Can drinking lots of water lower my blood sugar?

Drinking extra water will not dilute your blood sugar levels if you are already fully hydrated. However, being dehydrated can cause blood sugars to concentrate and subsequently rise. Dehydration can worsen diabetic ketoacidosis (DKA) and hyperosmolar hyperglycemic state (HHS). In general, it's a good idea to have at least 64 ounces of water daily, unless you are instructed to follow a fluid restriction from your doctor. This 64 ounce fluid recommendation can increase due to activity levels, time of year and personal preference.

Drinking water can lower blood sugar levels by diluting the amount of glucose (sugar) in the blood stream.

Mr. Eliot LeBow, CDE, LCSW

The answer is yes, indirectly it will reduce insulin resistance and help a person reduce their hunger.

Drinking 8 glasses of water a day appears to bring down one's blood sugars by reducing insulin resistance due to proper hydration. While at the same time the more water you drink the less hungry a person is so they tend to eat less during the day, similar to drinking a glass of water prior to eating fills the stomach causing a person who is dieting to reach satiation (fullness) sooner. 

If your blood sugars are very high and your kidney is not able to process all the sugar, water will help remove the excess sugar and ketones out of your system.

Drinking water is important for everyone but for diabetics, especially type 1 diabetics, it is crucial to remove excess ketones from the blood stream and reduce dehydration when blood sugars are high. 

Continue Learning about Diabetes

Manage Insulin-Dependent Diabetes With 90-Day CGMs
Manage Insulin-Dependent Diabetes With 90-Day CGMs
When you think of humans with implants, you may picture sinister movie characters like Dr. No with bionic metal hands or the Borg from Star Trek. But ...
Read More
What was the Diabetes Control and Complications Trial?
American Diabetes AssociationAmerican Diabetes Association
The Diabetes Control and Complications Trial (DCCT) was a 10-year study sponsored by the National In...
More Answers
4 Ways Winter Affects Your Diabetes
4 Ways Winter Affects Your Diabetes4 Ways Winter Affects Your Diabetes4 Ways Winter Affects Your Diabetes4 Ways Winter Affects Your Diabetes
Cold hands could be a bigger problem than you think.
Start Slideshow
What Are DPP-4 Inhibitors?
What Are DPP-4 Inhibitors?

Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.