"Drink more water" is advice everyone hears on a GLP-1. But how much is enough, and how do you actually get there when you rarely feel thirsty or hungry? Here's a practical guide.
The general daily guide
The Institute of Medicine set general daily guides for total water, meaning all the water you get from drinks and food:
| Total water per day | |
|---|---|
| Women | About 2.7 liters (91 oz) |
| Men | About 3.7 liters (125 oz) |
Food usually provides a meaningful share. Fruit and vegetables are about 90% water by weight, and meat, fish and poultry about 60–70%. When you eat less on a GLP-1, you also get less water from food, so drinks may need to make up more of the total.
These are general guides, not personal targets. Heat, exercise, illness and health conditions change your needs. Ask your prescriber for your number, especially if you have kidney or heart disease or follow a fluid or sodium limit.
Why fluids matter more on a GLP-1
- Less food means less water from food.
- Less appetite can mean less thirst, or simply fewer drinks with meals.
- Stomach side effects can drain fluids. In trials, 44% of adults on Wegovy 2.4 mg reported nausea and 30% diarrhea; on Zepbound 15 mg, 28% reported nausea and 23% diarrhea. Both labels warn that these side effects can lead to dehydration, which has been linked to kidney problems in some patients.
An easy hour-by-hour plan
Spreading fluids through the day is easier than drinking a lot at once when your stomach feels full. Here's one way to reach about 2 liters from drinks (adjust with your doctor):
| Time | Amount | Idea |
|---|---|---|
| On waking | 500 ml (17 oz) | A full bottle before coffee |
| Mid-morning | 250 ml (8 oz) | Sip at your desk |
| Lunch | 250 ml (8 oz) | With your meal |
| Afternoon | 500 ml (17 oz) | Refill once, sip slowly |
| Dinner | 250 ml (8 oz) | With your meal |
| Evening | 250 ml (8 oz) | Herbal tea or water |
Tips when you're never thirsty
- Use a marked bottle so you can see your progress.
- Set phone reminders every 1–2 hours.
- Add flavor. A flavored, zero-sugar drink can make water easier to finish.
- Eat your water: soups, yogurt, watermelon, cucumber and berries all count.
- Sip, don't chug, especially if you feel nauseous.
Signs you need to drink more, or call a doctor
Dark yellow urine, a dry mouth, headache and feeling light-headed can all be signs you're low on fluids. Call your doctor if you can't keep fluids down, have ongoing vomiting or diarrhea, pass very little urine or feel very dizzy. More in Feeling tired or dizzy on Ozempic or Wegovy?
Where Zibby fits
Zibby Hydration is a zero-sugar drink mix made for women on a GLP-1 routine. One stick in your morning bottle adds sodium, potassium and magnesium, vitamins C, B6 and B12, and 1,360 mg of creatine. It is designed to make the first, and often hardest, bottle of the day easier. See what's inside →
Frequently asked questions
How much water should I drink on Ozempic?
A general guide for women is about 2.7 liters of total water a day from drinks and food. Ask your prescriber for a personal target.
Does Mounjaro or Zepbound cause dehydration?
The Zepbound label warns that stomach side effects such as nausea, vomiting and diarrhea can lead to dehydration, which has been linked to kidney problems in some patients.
Does coffee count toward my water?
Most drinks, including tea and coffee, contribute to total water intake. Plain water and low-sugar drinks are the easiest everyday choices.
Sources
- Institute of Medicine water, sodium and potassium intakes (LSU AgCenter summary)
- Wegovy prescribing information
- Zepbound prescribing information
This article is for general education and is not medical advice. *These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.