The short answer
Salted fluids first: broth, salted water or a sugar-free electrolyte mix, in small sips. Then small, low-fat meals with protein and soluble fiber: eggs, rice, oats, bananas, plain chicken or fish, cooked vegetables. Leave fat, sugar, sugar alcohols, caffeine, alcohol and dairy off for a few days. Bananas, rice and toast are a start, not a plan.
This is the plate our support team at GLP-1 SOS describes more than any other, so here it is in full: what to drink first, what to eat, and what to leave off for a few days.
The plate for a loose day
Eat this, leave that off
Eat
- Broth, salted water or a sugar-free electrolyte mix, in small sips
- Rice, oats, toast
- Banana
- Boiled egg
- Plain chicken or fish, small portions
- Greek yogurt or cottage cheese, if dairy suits you
- Cooked vegetables
Leave off for a few days
- Fried and greasy food, cream sauces, fast food
- Sugary drinks, juice, dessert
- Sugar-free gum and candy with sorbitol, xylitol or mannitol
- Coffee, caffeinated tea, alcohol
- Carbonated drinks
- Milk and ice cream, if they loosen you
What is actually happening
A GLP-1 medication slows how fast your stomach empties and how your gut moves things along. The prescribing information for Ozempic, Wegovy, Mounjaro and Zepbound all state that the medication delays gastric emptying, and diarrhea is among the most common reactions in their trials: about three adults in ten on Wegovy, roughly one in five on Zepbound. It clusters in the first weeks and after each dose increase, and usually eases as the gut adapts.
On a slowed gut, three things turn into loose stool. Fat, because a slow stomach handles it badly and what is poorly digested pulls water into the stool. Sugar, including fruit sugar, lactose, and the sugar alcohols in sugar-free products, because bacteria ferment what sits too long and the by-products loosen the stool. And volume: a large meal, or a large glass of liquid poured onto a full stomach.
Diarrhea takes water and salt with it. In the body, water follows salt, so plain water alone does not stay; sodium and potassium decide where it goes. That is why the first food on a loose day is a salted fluid, not a plate.
Soluble fiber is the quiet ally. Oats, psyllium, chia and cooked vegetables form a gel that absorbs the excess water in loose stool and holds water in hard stool. On a medication where the two alternate, it steadies both.
Lab note
Bananas, rice and toast are a start, not a plan.
The day plan
Four moves, in order
1
Salted fluids first
A few sips every ten to fifteen minutes. Water follows salt, so plain water alone does not stay.
2
Small, plain plate
Something every three to four hours. Volume is the enemy of a slow gut.
3
Protein from day one
Eggs, fish, chicken, Greek yogurt in small portions. Muscle is what you want to keep.
4
Soluble fiber, gently
A small bowl of oats or half a serving of psyllium in a full glass of water, once a day.
What to do
- Fluids with salt, first and through the day. A cup of broth, water with a pinch of salt, or a sugar-free electrolyte mix, a few sips every ten to fifteen minutes. Drink between meals, not with them. Urine going from dark to pale yellow is the sign it is working.
- Start small and plain. Rice, oats, a banana, toast, a boiled egg, plain chicken or fish, a cup of soup. Something every three to four hours, stopping at satisfied. Volume is the enemy of a slow gut.
- Add protein early. Bananas, rice and toast on their own are low in protein, and muscle is what you want to keep. Eggs, Greek yogurt if dairy suits you, cottage cheese, fish and chicken in small portions belong on day one, not day three.
- Add soluble fiber gently. A small bowl of oats, or half a serving of psyllium in a full glass of water, once a day. It firms loose stool by absorbing the excess. Skip bran and raw vegetables for now.
- Leave off, for a few days: fried and greasy food, cream sauces, fast food; sugary drinks, juice and dessert; sugar-free gum, candy and drinks with sorbitol, xylitol or mannitol; coffee, tea with caffeine, alcohol and carbonated drinks; and milk products with lactose, if they loosen you.
- Return to your normal plate as soon as the stool steadies. The NIDDK guidance for diarrhea is to eat your usual diet as soon as you feel able, not to stay restricted, and most people are back within two or three days.
- Plan the shot week. Diarrhea is most likely two or three days after the injection and in the two weeks after a dose step. Keep those days smallest and simplest, and if the pattern does not ease, bring it to your prescriber.
Honest options
If you want to buy one thing
From any grocery store
- Broth, water with a pinch of salt, or a sugar-free electrolyte mix, in small sips through the day
- Rice, oats, a banana, a boiled egg, plain chicken or fish, in small portions every three to four hours
- A small bowl of oats or half a serving of psyllium in a full glass of water, once a day
This is the plate. It is what we tell people who write to us on a loose day, and it costs nothing extra.
What we make
- GLP-1 SOS Daily Gut Relief: ginger root, peppermint and a 19-strain probiotic blend with digestive enzymes for the loose, gassy days, two capsules with dinner
- 250 mg of magnesium citrate and oxide for the stuck days that usually follow, so the swing does not need a second bottle
- B12, B6, iron, folate and zinc for the energy dip that comes with eating this little
60-day money-back guarantee. Made by GLP-1 SOS, the people behind this Lab.*
*GLP-1 SOS Daily Gut Relief supports regular bowel movements and digestive comfort. 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.
When to call your doctor
Call your prescriber the same day if:
- You cannot keep liquids down
- You feel faint when you stand
- There is pain
- You are vomiting
- Your belly stays swollen and hard
- Diarrhea lasts more than two days
- There is blood or black stool
- You have a fever
- You go more than five days without a bowel movement between episodes
Loose for a day is normal. Losing fluid you cannot replace is not.

From the people behind the Lab
You do not have to figure this out alone.
GLP-1 SOS is the daily companion made for life on a GLP-1. Plain answers like this one, a support team that replies to real questions from real people, and daily formulas designed around the side effects that come with the medication. The GLP-1 Lab is our free education arm: no login, no paywall, no hype. Side effects are part of the road. Suffering through them is not.
Questions people also ask
Is the BRAT diet good for GLP-1 diarrhea?
Bananas, rice, applesauce and toast are fine for a day: low in fat, easy on a slow stomach. But they are almost no protein and no salt, and current guidance does not recommend staying on a restricted diet. Use them as the first meal, add eggs, chicken or fish by the second, and return to your normal plate as the stool steadies.
What should I drink with diarrhea on a GLP-1?
Fluids with salt, in small sips: broth, water with a pinch of salt, or a sugar-free electrolyte mix. Oral rehydration solutions from the pharmacy work too. Skip juice, sugary sports drinks, coffee, alcohol and carbonated drinks for a few days; sugar and bubbles both make a slow gut looser.
Should I stop eating fiber when I have diarrhea on a GLP-1?
Stop the insoluble kind for now: bran, raw vegetables, salads. Keep or add a small amount of the soluble kind: oats, psyllium in a full glass of water, cooked vegetables. Soluble fiber forms a gel that absorbs the excess water and firms the stool, which is why it helps in both directions.
Can I eat dairy with GLP-1 diarrhea?
Test it. Lactose is one of the sugars a slowed gut ferments into loose stool, so milk and ice cream often make it worse for a few days. Greek yogurt and hard cheese are lower in lactose and higher in protein, and many people tolerate them in small portions. If dairy loosens you, leave it off until the stool steadies.
Sources (6)
- Eating, Diet, & Nutrition for Diarrhea. NIH National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), reviewed 2024.
- Treatment for Diarrhea. NIH National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), reviewed 2024.
- Wegovy (semaglutide) injection, Prescribing Information. Novo Nordisk / FDA, revised February 2026.
- Zepbound (tirzepatide) injection, Prescribing Information. Eli Lilly, revised August 2026.
- Clinical Recommendations to Manage Gastrointestinal Adverse Events in Patients Treated with GLP-1 Receptor Agonists: A Multidisciplinary Expert Consensus. Journal of Clinical Medicine, 2023.
- GLP1 and GIP Receptor Agonists: Effects on the Gastrointestinal Tract and Management Strategies for Primary Care Physicians. Mayo Clinic Proceedings, 2025.
Reviewed by the GLP-1 SOS editorial team · Education, not medical advice · Talk to your prescriber about your dose and your symptoms.

