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GLP-1 medications are gaining traction as insurance coverage expands and more people explore them as part of their health journey (11). But while access is improving, many patients aren’t getting the nutrition guidance they need to manage common side effects, putting them at risk for issues like dehydration.
In fact, decades of research show that people taking GLP-1 medications may be more prone to dehydration, especially when intake drops or side effects make it harder to eat and drink enough (2,3).
The good news? Staying well hydrated is absolutely doable with the right strategies. Ahead, we’ll break down why dehydration can happen on GLP-1 medications, the signs to watch for, and simple, practical tips to help you stay hydrated and supported every step of the way.
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Why GLP-1 Medications Can Increase Dehydration
GLP-1 medications work in part by reducing appetite, which is a big reason they’re effective for weight loss (4). But along with fewer food cravings, research shows that some people taking these medications may also be at higher risk for dehydration and nutrient shortfalls (3,5).
There are a couple of reasons this can happen. First, side effects like nausea, vomiting, and diarrhea are fairly common, especially early on, and all of these can affect your body’s fluid balance (9). Second, when food intake drops, it’s easy for fluid intake to fall too. If you’re eating less overall, you may not feel as motivated to drink, which can quietly set the stage for dehydration (7).
In more severe cases, ongoing fluid loss can strain the kidneys (8). The good news? There are proactive steps you can take to protect your hydration and overall health. Before we dive into those strategies, let’s walk through the most common signs of dehydration to keep on your radar.
What to Expect on GLP-1s: Typical Side Effects and Symptoms
Common Signs You May Be Dehydrated
Your body is pretty good at sending signals when your fluid intake isn’t meeting your needs. Whether dehydration is related to GLP-1 side effects or simply not drinking enough, the warning signs tend to look very similar (9).
Common signs of mild dehydration include (9):
Feeling thirsty
Dry mouth
Headaches
Dark yellow urine
Urinating less often than usual
Muscle cramping
If dehydration continues over time, symptoms can become more serious. Signs of more severe dehydration include (9):
Little to no urination, or very dark yellow or amber-colored urine
Dry, shriveled-looking skin
Dizziness or lightheadedness
Irritability or confusion
Rapid heartbeat
Rapid breathing
Sunken eyes
Extreme tiredness or listlessness
In severe cases, shock or loss of consciousness
Spotting these signs early can help you take action before dehydration becomes a bigger issue, especially if you’re managing side effects from GLP-1 medications.
How Much Water Do You Need on GLP-1s?
Fluid needs aren’t one-size-fits-all. How much you need depends on factors like your age, body size, activity level, and even the climate you live in (10). That’s why it’s important to work with your healthcare team to figure out a daily fluid goal that makes sense for you.
On average, research published in JAMA Internal Medicine suggests that many people taking GLP-1 medications should aim for about 8 to 12 cups of fluids per day (roughly 2 to 3 liters), along with eating plenty of high-water foods (7). That said, this amount is still lower than the general daily water recommendations for adults ages 19 to 30, which are 3.7 liters per day for men and 2.7 liters per day for women (10).
The biggest takeaway? Let your body guide you. Look for light, pale-colored urine and regular bathroom trips throughout the day. Pay attention to how you feel, too. Your energy levels, skin, and overall mood can all offer helpful clues about whether you’re staying adequately hydrated.
The Fastest Ways to Rehydrate
Tips to Stay Hydrated During Your GLP-1 Weight Loss Journey
You don’t need to add another big task to your mental to-do list to drink more water. Staying hydrated can be as simple as building small, consistent habits into your day. As MyFitnessPal dietitian Katherine Basbaum puts it, “Hydration shouldn’t feel like a chore, make it fun! Try adding lemon or fruit to your water, use a reusable bottle you actually like, and track your fluids in the app. Set a daily goal, and if you hit it consistently for a couple of weeks, reward yourself with something fun, like that new water bottle you’ve been eyeing.”
Try these simple tips to stay hydrated:
Start your day with water. Drink one cup of water before your morning coffee or tea to set the tone for the day.
Keep water within reach. Refill a reusable bottle and bring it with you. Sip throughout the day instead of gulping all at once.
Eat your fluids, too. Add water-rich foods like cucumbers, watermelon, and broth-based soups to meals and snacks.
Be mindful of caffeine and alcohol. These can contribute to fluid loss, so aim to limit them or balance them with extra water (12).
Listen to your body. If your urine looks darker than usual or your eyes feel dry, that’s your cue to grab a glass of water.
Small changes add up and over time, these habits can make staying hydrated feel automatic.
5 Smart and Simple Ways to Stay Hydrated
Bottom Line
GLP-1 medications can be a powerful tool for weight management, but they also bring unique challenges, especially when it comes to staying hydrated. (4,2). Between side effects that reduce appetite and fluid intake, and the body’s natural signals that can be easy to miss, dehydration is a real concern. (2)
With awareness and small, consistent habits, you can support your hydration and your overall health. Pay attention to your body’s cues, aim for fluids and water-rich foods throughout the day, and make hydration simple and enjoyable. Remember, it’s not about a perfect routine, it’s about building habits that work for you and keeping your body fueled on your GLP-1 journey.
Let MyFitnessPal help you get started tracking your hydration today with the in-app water tracker.
The post Staying Hydrated on GLP-1s: Why it Matters More Than You Think appeared first on MyFitnessPal Blog.
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