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Low Water Intake Linked to High Blood Sugar
Keep in mind that this is a correlation between water intake and blood sugar, and no cause-and-effect was proven. However, a cause-effect is still plausible -- antidiuretic hormone (ADH, aka vasopressin) could be the potential link.
ADH levels rise during dehydration, causing the kidneys to conserve water. However, higher ADH levels may act on the liver, causing it to produce and release glucose.
The study accounted for intake of sugary drinks and alcohol, as well as people's body weight at the start of the study, their reported exercise levels and other health factors -- and the link between low water intake and high blood sugar remained. However, they could not control for everything, including generally healthy or less-healthy eating habits (as people who live healthier lifestyles usually have a healthier diet and drink lots of water).
I recently covered another study on water consumption and its requirements as we age.
Source: Low Water Intake and Risk for New-Onset Hyperglycemia
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