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The 24-hour liquid diet before surgery on Ozempic, Wegovy, Mounjaro or Zepbound
GLP-1 medicines slow your stomach, so many surgical teams ask for clear liquids only for the 24 hours before surgery. Enter your surgery (or hospital arrival) time and get an hour-by-hour schedule: your last normal meal, what you can drink, and when everything stops.
Quick answer
If your team has asked for the GLP-1 liquid diet: eat your last solid meal 24 hours before surgery, then take clear liquids only (water, pulp-free juice, black coffee or tea, clear sports drinks, clear broth), and stop everything 2 hours before your arrival time unless told otherwise. Clear = you can see through it: no milk, smoothies, protein shakes or alcohol. This is the 2024–2025 guideline default for higher-risk GLP-1 users — your team's own instruction always takes precedence.
What's clear and what's not
✅ Clear liquids — allowed until the final cut-off
- Water (still or sparkling)
- Pulp-free apple or white-grape juice
- Black coffee or tea — no milk, no cream
- Clear sports drinks / electrolyte drinks
- Clear broth (strained, no bits)
- Plain gelatin (no fruit pieces)
❌ Not clear — counts as food
- Milk, cream, coffee with either
- Smoothies and protein shakes
- Orange juice or anything with pulp
- Soup with bits, congee, yogurt drinks
- Chewing gum and hard candy (ask your team)
- Alcohol — never before surgery
Simple test: pour it in a glass and hold it to the light — if you can't read through it, don't drink it.
Frequently asked questions
Why do GLP-1 users need a 24-hour liquid diet before surgery?
GLP-1 medicines (Ozempic, Wegovy, Mounjaro, Zepbound, Rybelsus and others) slow how fast the stomach empties, so solid food can still be sitting in the stomach at surgery time even after normal fasting. Guidance from the anesthesia and GI societies (2024–2025) says higher-risk GLP-1 users should switch to clear liquids only for the 24 hours before surgery — liquids leave the stomach much faster than solids, so the stomach is more reliably empty for anesthesia.
What counts as a clear liquid?
A liquid you can see through at room temperature: water, pulp-free apple or white-grape juice, black coffee or tea (no milk or cream), clear sports drinks, clear broth, and plain gelatin. NOT clear: milk, cream, smoothies, protein shakes, orange juice with pulp, soup with bits, yogurt drinks, and alcohol (never before surgery).
When do I stop drinking completely?
Usually 2 hours before your arrival/anesthesia time even clear liquids stop, unless your team gives you a different cut-off. Small sips of water to take approved morning tablets are usually allowed — confirm which medicines to take with your team.
Do I also need to skip my GLP-1 dose?
That's a separate decision your team makes. Current guidance lets many patients continue their GLP-1; if your team does want it held, weekly injections are typically held about a week before and daily forms on the day of surgery. Our GLP-1 hold-date calculator works that out — this page only plans the liquid-diet day.
My team didn't mention a liquid diet — should I do it anyway?
Ask them first. The 24-hour clear-liquid diet is the guideline default for higher-risk GLP-1 users (recent dose increase, nausea/bloating, weekly high-dose injections), but your team's instruction always wins. This planner is for patients whose team has recommended it, or to bring to your pre-op call as a question.
Is my information saved?
No. The schedule is generated on your device; nothing you enter is stored or sent anywhere. Print it or save it as a PDF for the fridge door.