Plain white toast can help during a bout of diarrhea, but it’s not the powerful remedy many people assume. Toast is easy to digest and low in fiber, which means it won’t aggravate your gut the way heavier foods might. But major health organizations no longer recommend building your diet around toast and other bland foods when you have diarrhea. The better approach is returning to your normal diet as soon as you feel up to it.
Why Toast Helps (a Little)
White toast works in your favor during diarrhea for a simple reason: it’s made from refined wheat, which has had the bran and germ stripped away. That removes most of the insoluble fiber, the type that speeds up digestion and can make diarrhea worse. Refined wheat also contains soluble fiber, which absorbs fluid in the gut and slows things down. The result is firmer, less frequent stools.
A low-fiber diet limits how much undigested food moves through your digestive tract, so your body produces less stool and what it does produce moves more slowly. White toast fits neatly into that category. It also provides a small amount of sodium, around 150 mg per slice, which helps replace some of the electrolytes you lose during diarrhea.
The BRAT Diet Is Outdated
Toast is best known as the “T” in the BRAT diet: bananas, rice, applesauce, and toast. For decades, this was the go-to recommendation for managing diarrhea, especially in children. The logic was that these bland, low-fiber foods would be gentle on an irritated gut.
That advice has fallen out of favor. The American Academy of Pediatrics no longer recommends the BRAT diet, calling it too restrictive. The Centers for Disease Control and Prevention and the World Health Organization agree. The concern is straightforward: limiting yourself to just a few bland foods during illness can impair nutritional recovery and, in prolonged cases, lead to deficiencies. Your body needs protein, fat, and a range of vitamins and minerals to heal, and four bland foods don’t deliver that.
Current guidelines from the National Institute of Diabetes and Digestive and Kidney Diseases are clear: most experts don’t recommend following a restricted diet when you have acute diarrhea. Once you feel like eating again, you can eat your normal diet. Studies in children have consistently shown that continuing a regular diet actually reduces the duration of diarrhea compared to restricting foods.
White Bread, Not Whole Grain
If you do reach for toast, the type of bread matters. White bread is the better choice during diarrhea. Whole grain, whole wheat, and anything containing bran is harder to digest because of its high insoluble fiber content. Insoluble fiber doesn’t absorb water. Instead, it adds bulk and speeds up movement through the gut, which is the opposite of what you want.
Other starchy, low-fiber foods work just as well as toast: plain white rice, potatoes, crackers, and plain pasta all fall into the same category. There’s nothing uniquely therapeutic about toast itself. It’s just one option among several easy-to-digest starches.
Keep It Plain
What you put on the toast matters as much as the toast itself. Skip the butter, cream cheese, or any fatty spread. When your digestive system is already struggling, fat that isn’t fully absorbed in the small intestine passes to the colon, where it gets broken down into fatty acids. Those fatty acids cause the colon to secrete extra fluid, which triggers more diarrhea. Harvard Health Publishing notes this is a common and often overlooked cause of persistent symptoms.
Jam or jelly in small amounts is less likely to cause problems, though high-sugar toppings can pull water into the intestines in some people. Plain is safest.
When Toast Could Make Things Worse
For most people, plain white toast is harmless during diarrhea. But if your diarrhea is caused by a reaction to gluten, toast will make the problem worse, not better. Celiac disease affects roughly 1% of people and causes the immune system to attack the lining of the small intestine when gluten (a protein in wheat, barley, and rye) is consumed. Diarrhea, bloating, and abdominal pain are hallmark symptoms.
There’s also non-celiac gluten sensitivity, where people develop similar digestive symptoms after eating gluten-containing foods without having celiac disease. Research from the American College of Gastroenterology suggests that in some of these cases, the real trigger may not be gluten at all but certain fermentable sugars called FODMAPs that happen to be present in the same foods. Either way, if you notice that eating bread or wheat products consistently coincides with digestive trouble, toast is not your friend during a flare-up.
Hydration Matters More Than Food Choices
The most important thing during diarrhea isn’t what you eat. It’s what you drink. Diarrhea pulls water and electrolytes out of your body quickly, and dehydration is the primary risk, especially for young children and older adults. Oral rehydration solutions, broth, and water are more critical to recovery than any particular food. Once you’re staying hydrated, eating whatever you can tolerate is the right move. If that’s toast, fine. If it’s chicken soup or a normal meal, that works too.
There’s no need to force yourself to eat only bland foods or to stay on a restricted diet for a set number of days. Your body will recover faster with adequate nutrition than it will on toast alone.