Managing Diabetes
Hydration and Diabetes: Drinks, Tips, and Myths (and How Dexcom G7 Can Help)
Published: Mar. 6, 2026
5 min read
The content in this article should not be taken as medical advice. Please consult with your healthcare provider regarding your individual health needs.
Staying properly hydrated is an important—yet sometimes overlooked—aspect of diabetes management. For people with diabetes, especially those using continuous glucose monitoring (CGM) systems like the Dexcom G7 and Dexcom G7 15 Day, hydration plays a crucial role in maintaining stable glucose levels.
When an individual is dehydrated, the amount of glucose in the blood doesn't actually rise. Instead, there is less water in the bloodstream, which makes the glucose more concentrated. Because of this higher concentration of glucose, readings are elevated.
This article provides practical hydration strategies, addresses common beliefs about hydration and diabetes, and shows how Dexcom CGM technology can help you understand the connection between your fluid intake and glucose management.
Why Hydration Is Critical for Diabetes Management
The Physiological Connection
Proper hydration serves vital functions for people with diabetes:
- Kidney Support: Adequate hydration supports normal kidney filtration and urine production. When glucose levels are high, excess glucose is flushed out by the kidneys in the urine, potentially leading to further dehydration.
- Long-term Health: Chronic dehydration can be particularly dangerous for people with diabetes, as it can lead to increased stress hormones and potentially damage nerves and kidneys over time.
Dehydration Impact on People Living with Diabetes
Dehydration can create a perfect storm of complications for diabetes management:
- Higher Risk of Hyperglycemia: When dehydrated, your body may experience increased insulin resistance, making it harder to control glucose levels
- DKA Risk: Dehydration significantly increases the risk of developing diabetic ketoacidosis (DKA), a serious and potentially life-threatening condition
- Compromised Decision-Making: Even mild dehydration can affect cognitive function, making it harder to manage your diabetes effectively
Best Drinks for Staying Hydrated When You Have Diabetes
Here are some of the best drinks and food choices to help you stay hydrated and better manage your glucose levels:
Top Hydration Choices
- Water (Always #1)
- Plain water remains the gold standard for hydration
- Zero calories, zero carbs, zero complications
- Helps maintain optimal glucose levels
- Infused Water
- Add natural flavor without the sugar: lemon, cucumber, or mint
- Makes hydration more enjoyable without impacting glucose levels
- Unsweetened Tea or Coffee (In Moderation)
- Contrary to popular belief, having coffee and tea on occasion can contribute to hydration
- Choose unsweetened varieties to avoid glucose spikes
- Green and herbal teas offer additional benefits, like antioxidants and anti-inflammatory effects
- Low-Sugar Electrolyte Drinks
- Essential during exercise or hot weather
- Look for options with less than 5 grams of sugar per serving
- Check labels carefully—"low sugar" doesn't always mean diabetes-friendly. Look at the total carbohydrates, the sugar source, and for hidden sugars1
Hydrating Foods
Don't overlook fruits and vegetables that contribute to hydration:
- Watermelon
- Cucumber
- Celery
- Strawberries
- Lettuce
- Tomatoes
Drinks to Be Aware Of
Sugary Sodas and Sweet Teas
- Can cause rapid glucose spikes
- Provide empty calories without nutritional benefit
- May lead to dehydration paradox—not drinking enough water can cause the body to compensate by retaining fluid and can make it more challenging to adequately rehydrate
Coconut Water
- Often marketed as "natural," but contains significant natural sugars
- One cup can contain 9-10 grams of carbohydrates
Sports Drinks with Added Sugar
- Designed for intense athletic activity, not everyday hydration
- Often contain 20-30 grams of carbs per bottle
Alcoholic Beverages with Mixers
- Alcohol can interfere with glucose regulation
- Mixers often contain high amounts of sugar
- Can mask symptoms of hypoglycemia
Common Beliefs About Hydration and Diabetes
Managing diabetes effectively means understanding the facts behind common beliefs about hydration. We encourage people with diabetes to research and talk to their doctor about what works best for their individual hydration and diabetes management needs.
"Drinking More Water Lowers Blood Sugar Instantly"
What to Research: While water helps lower the concentration of glucose in your body, it's not a quick fix for high glucose levels. Proper hydration supports overall glucose management but shouldn't replace medication or other prescribed treatments.
"Electrolyte Drinks Are Always Safe for Diabetes"
What to Research: Many electrolyte drinks contain hidden sugars that can impact glucose levels. Always check labels and consider the carbohydrate content of the drink in your diabetes management plan.
"Coffee Dehydrates You"
What to Research: Modern research shows that moderate coffee consumption (3-4 cups daily) actually contributes to hydration rather than causing dehydration. However, individual responses may vary.
Understanding how certain liquid intake affects you helps you make informed decisions about your hydration strategy that align with your specific diabetes management goals.
Where Dexcom G7 + Dexcom G7 15 Day Can Help
Here are some features and benefits of Dexcom G7 CGM that help you stay hydrated:
Real-Time Insights
Your Dexcom G7 provides continuous feedback showing how hydration (or dehydration) impacts your glucose levels. You can receive real-time alerts and make immediate adjustments to your fluid intake.
Trends and Pattern Recognition
The Dexcom G7 app* allows you to log hydration habits and compare them with your glucose trend data over time. This data helps you understand your personal hydration needs and optimal fluid intake timing.
Empowerment Through Data
With continuous data from your Dexcom G7 or Dexcom G7 15 Day, you can:
- Adjust fluid intake proactively based on glucose trends
- Identify dehydration-related glucose spikes before they become problematic
- Discuss hydration-glucose correlations with your healthcare provider
Practical Tips for Optimal Hydration
Daily Recommended Water Intake
- Aim for 8–12 cups of water daily (adjust for activity and climate)*
*Unless a fluid restriction has been advised by your healthcare provider, as some individuals—especially those with certain cardiac or renal diseases— might be advised to follow specific fluid recommendations.
Make It Easier
- Carry a water bottle so hydration is always within reach
- Set a glass of water by your bedside so you can take a quick sip as soon as you wake up or before going to sleep
- Make it a game: Create a friendly competition in your household to encourage water intake
- Check labels on flavored waters and electrolyte drinks for hidden sugars
- Use your Dexcom G7 trend data to fine-tune your hydration habits
Leverage Your Technology
- Use the Events section in the G7 app to log water intake under "Notes"
- Monitor glucose patterns before and after hydration to identify personal trends
- Set custom alerts to remind yourself to hydrate regularly
For Athletes with Diabetes
Staying hydrated is vital when you are an athlete, and even more so when you are an athlete living with diabetes. Check out specialized tips from Dexcom athletes: Tips for People with Diabetes from Dexcom Athletes
Take Action: Your Hydration Journey Starts Now
Proper hydration is essential for glucose stability, and smart beverage choices combined with CGM technology give you the power to visualize the impact of your hydration decisions in real-time.
The combination of mindful hydration and continuous glucose monitoring creates a powerful duo for diabetes management. Your Dexcom G7 or G7 15 Day doesn't just show you numbers—it helps you understand the story behind those numbers, including how something as simple as drinking water affects your glucose control.
Next Steps:
- Discuss hydration strategies with your healthcare provider
- Explore how Dexcom CGM can contribute to improved glucose management and overall health
- Start tracking your hydration patterns using your CGM data
Ready to take control of your diabetes management with advanced CGM technology?
1 American Diabetes Association. (n.d.). Sports drinks impact on glucose (blood sugar). Sports Drinks Impact on Glucose (Blood Sugar) | American Diabetes Association. https://diabetes.org/health-wellness/fitness/sports-drinks-impact-on-glucose-blood-sugar#:~:text=Electrolytes:%20During%20exercise%2C%20you%20lose,of%20carbohydrates%20per%2012%20ounces. *Compatible smart devices sold separately. To view a list of compatible devices, visit https://www.dexcom.com/compatibility