Is Oatmeal Good for Diarrhea?

Yes, plain oatmeal may be a reasonable choice during diarrhea if you tolerate it, because its soluble fiber holds water and may help firm loose stools.

Is oatmeal a good choice during diarrhea?

Oatmeal is a soft food that some people can tolerate while they have diarrhea. It is not a proven treatment, and it may not agree with everyone.

We found no clinical studies directly testing oatmeal for diarrhea. Its soluble fiber provides a plausible reason it might help stool consistency, but that does not establish that it will help you or shorten an episode.

Replacing lost fluids and getting medical care when needed are more important than eating any particular food. For a wider range of options, see the best foods for diarrhea.

How might oatmeal affect loose stools?

Oatmeal contains a soluble fiber called beta-glucan. Soluble fiber takes up water and forms a gel, which could help give loose stool more consistency. This is a possible mechanism, not proof that a serving of oatmeal will stop diarrhea.

Oatmeal also contains insoluble fiber, and people respond to fiber differently. A large amount of oatmeal or a sudden increase in fiber may cause bloating or discomfort, especially when your digestive system is already upset.

The cause of diarrhea matters, too. Oatmeal cannot be relied on to address an infection, a medication side effect, or another underlying cause. If it makes you feel worse, there is no reason to force yourself to eat it.

What does the evidence say about oatmeal and diarrhea?

We found no clinical studies on oatmeal and diarrhea. There is therefore no direct trial evidence cited here that oatmeal reduces loose stools, prevents dehydration, or makes diarrhea end sooner.

The water-holding property of soluble fiber is a reason oatmeal might help some people, but it does not tell us how much benefit to expect. There is also not enough evidence here to say that oatmeal works better than another food you tolerate.

Consider oatmeal a possible part of your diet, not a treatment with a predictable result. If symptoms are severe or continue, changing foods should not delay medical advice.

How should you eat oatmeal during diarrhea?

Choose plain oatmeal and cook it in water until soft, following the package directions. Plain instant oatmeal is also an option. Start with a small serving and see how you feel before eating more.

Keep additions simple while symptoms are active. Rich toppings and heavily sweetened products may be harder for some people to tolerate. Sweeteners called sugar alcohols can cause diarrhea in some people, so check the label if a product contains them.

Some people temporarily have trouble digesting lactose after a gastrointestinal illness. If milk seems to worsen your symptoms, prepare oatmeal with water instead. If oatmeal itself consistently causes more discomfort or looser stools, set it aside.

You do not need to follow an oatmeal-only diet or avoid food altogether. Eat other foods you tolerate and return to a varied diet as your appetite and tolerance improve.

Replacing fluids matters more than eating oatmeal. An oral rehydration solution can help replace fluid and salts lost through diarrhea; prepare it according to its label. For more on hydration, see the best drinks for diarrhea.

Who should be careful, and when should you seek care?

Seek urgent medical care for blood or black, tarry stool, severe abdominal pain, or a high fever. Get prompt medical advice if you cannot keep fluids down, are urinating much less than usual, or feel dizzy. Confusion, fainting, or severe dehydration calls for emergency care.

Contact a clinician if diarrhea persists or is getting worse. Children can become dehydrated quickly, so seek advice promptly for a child with diarrhea, especially an infant or a child with signs of dehydration. Continue usual feeding as tolerated and ask a clinician about oral rehydration.

Older adults, pregnant people, and people with weakened immune systems should seek medical advice promptly if they have significant diarrhea or trouble staying hydrated. People with conditions such as kidney disease or diabetes may also need individual guidance.

If you have been told to limit fluids, ask your clinician how to replace losses safely rather than increasing intake on your own. If diarrhea begins while you are taking a medication, including an antibiotic, contact your prescriber; do not stop prescribed medication on your own.

People with celiac disease should choose oatmeal labeled gluten-free to reduce the risk of gluten cross-contact. Follow your clinician’s advice about oats, as some people with celiac disease do not tolerate them.