Weekly Live Recap: Electrolytes & hydration on a GLP-1

Hydration is more than just drinking more water

Most people hear "hydration" and assume the answer is to drink more. Sometimes it is. But hydration is really about three things working together:

• Enough fluid in your body
• Enough electrolytes to regulate that fluid
• Enough consistency that your body isn't swinging between under-hydrated and overhydrated

On a GLP-1, all three of those can quietly slip at once. Lower appetite means lower food intake, which means less water and fewer electrolytes coming in from meals. Lower appetite often dampens thirst cues. And GI symptoms (nausea, constipation, diarrhea, vomiting) can affect both intake and losses.

What electrolytes actually do

Electrolytes are minerals that carry an electrical charge when dissolved in water, and that charge is how your nerves, muscles, heart, and digestive tract communicate.

• Sodium and chloride: regulate fluid balance and blood volume
• Potassium: muscle contraction (including the heart), blood pressure regulation
• Magnesium: involved in over 300 enzyme systems, including energy metabolism, muscle, and nerve function
• Calcium: bones and teeth, plus muscle contraction and nerve signaling

For most people in the U.S., the typical pattern is flipped from where it should be: too much sodium (often 4,000+ mg/day vs. a target around 2,300), and not enough potassium (often under 2,000 mg vs. a target closer to 4,000). Most people don't need more sodium. They need more potassium, magnesium, and calcium from food.

Plain water vs. electrolyte beverages

Plain water is usually enough when:

• You're eating regular meals every 3 to 4 hours
• You're not sweating heavily, vomiting, or dealing with diarrhea
• You generally feel steady (not dizzy, weak, or headachy)
• Your urine is pale yellow to light yellow throughout most of the day
• Your workouts are under an hour

Electrolytes become more useful when:

• You're losing more fluid than usual (vomiting, diarrhea, heavy sweating, hot weather)
• You're exercising hard for 60 to 75+ minutes
• You're at altitude, traveling, or recovering from alcohol
• Your overall food intake is very low or inconsistent
• Plain water feels intolerable due to nausea

Electrolytes aren't a moral upgrade to water. They're a tool, most useful when matched to a need.

The "panic chugging" mistake

One of the most common hydration patterns: realizing late in the day that you've barely had anything to drink and trying to make up for it with 40+ ounces all at once. On a GLP-1, this feels even worse: gastric emptying is already slower, so large volumes sit longer, increasing bloating, fullness, and sloshiness. It also makes water less appealing, so it backfires the next day.

Steady sips throughout the day work better than catch-up. Pairing fluids with meals and snacks is one of the simplest ways to build that consistency, since meals act as a natural cue.

Food counts as hydration

Hydration doesn't have to come from a giant water bottle. Many foods contribute meaningfully to fluid and electrolyte intake:

• Fruits and vegetables (broccoli is about 90% water)
• Yogurt, cottage cheese, milk, smoothies: fluid, protein, calcium, potassium
• Soups and broths: fluid plus a little sodium
• Oatmeal, rice bowls, pasta: water absorbed during cooking
• Applesauce, popsicles, ice chips

If plain water feels hard right now, leaning into water-rich foods is often more effective than forcing more ounces.

Choosing the right product

Match the product to the problem.

• Daily flavor / motivation to drink more water: a low-sodium electrolyte (ideally under 100 mg of sodium) with potassium, magnesium, and calcium can be a useful daily option for many people.
• Active rehydration (vomiting, diarrhea, heavy sweating): a higher-sodium product (typically 300 to 500 mg, not 1,500 mg) paired with a small amount of carbohydrate, since sodium and glucose are absorbed together and water follows.
• Persistent or severe symptoms: loop in your provider rather than self-treating with electrolytes alone.

A few products to be cautious of:

• Anything claiming detox, fat loss, hormone balance, or metabolism boosts. Electrolytes support hydration and normal physiology, not weight loss.
• Products very high in magnesium citrate, which acts as a mild laxative. A small amount can help; too much causes diarrhea, which then defeats the purpose.
• Very high-sodium products if you have hypertension, kidney disease, heart failure, or any reason to limit fluid or sodium intake.

If you're on medications that interact with potassium or magnesium, talk to your provider before adding a daily electrolyte product.

Forget the "ounces" rule: use check-ins instead

The "half your body weight in ounces" formula is a starting place, but it's often too little or too much depending on what you eat, how much you sweat, and what your symptoms are. Better daily check-ins:

• Is your urine pale yellow throughout most of the day? (Darker in the morning is normal: kidneys concentrate overnight.)
• Are you having dry mouth, dizziness when standing, headaches, low urine output, fatigue, or constipation?
• Pay extra attention around dose increases, when intake and thirst cues often quietly drop together.

Your action step this week

This week, notice your hydration pattern, not your total ounces:

• Are you sipping steadily throughout the day, or panic chugging at night?
• Are you eating enough water-rich foods (fruits, veg, yogurt, soups, smoothies)?
• Are you including potassium, magnesium, and calcium-rich foods?
• Are you using electrolytes that match a real need, or just adding extra sodium?
• Are you reaching out when symptoms feel bigger than something hydration alone can solve?

A useful rule of thumb: try to be about halfway through your fluids by lunchtime. Building hydration earlier in the day prevents the late-night chug and the all-night bathroom trips.

Join the next live session

Megan hosts live Q&A every Thursday at 11:00 AM MT. Sessions are free for all Belle patients and run about 30 minutes: one practical topic with takeaways you can use that day, followed by live questions.

Submit a question ahead of time by emailing care@joinbelle.com. Questions sent in by Monday are typically queued for that week's session.

The Belle Weekly Live with Megan Ostler sessions are part of Belle's ongoing nutrition and lifestyle support for patients on a provider-guided GLP-1 program.

Submit a question: care@joinbelle.com. Visit your Belle patient portal for past session recaps, worksheets, and the Thriving on GLP-1s lesson series.

Need support? Send us a note in Messages in your patient portal or text 877-359-1724. You can also email care@joinbelle.com.

Content developed for educational purposes. Always follow the guidance of your prescribing provider.