Most loose stools resolve within a few days with simple changes to what you eat, what you drink, and how you manage symptoms at home. Acute diarrhea typically lasts less than a week and goes away on its own, but there are concrete steps you can take to firm things up faster and feel better in the meantime. If loose stools persist beyond two weeks, that crosses into a different category that may need medical attention.
Adjust What You Eat First
Soluble fiber is one of the most effective tools for firming up loose stools. It absorbs water in your digestive tract and adds bulk, which helps transform watery stool into something more solid. Good sources include oats, bananas, apples, carrots, avocados, barley, and psyllium husk supplements. Most adults need between 21 and 38 grams of fiber daily depending on age and sex, but if you’re not currently eating much fiber, increase gradually to avoid gas and bloating.
You may have heard of the BRAT diet (bananas, rice, applesauce, toast) as a go-to for stomach trouble. It’s fine for a day or two during a bout of stomach flu or food poisoning, but there’s no research showing it works better than simply eating bland, easy-to-digest foods more broadly. You don’t need to limit yourself to just those four items. Plain chicken, potatoes, crackers, and cooked vegetables are all reasonable choices while your gut recovers.
Equally important is what you avoid. Greasy, fried, or very spicy foods can speed up digestion and worsen loose stools. Caffeine and alcohol both stimulate the gut and pull water into the intestines. Dairy may be a problem too, especially if you have any degree of lactose intolerance, since unabsorbed lactose draws water into the bowel through osmosis.
Watch for Hidden Sugar Alcohols
Sugar alcohols like sorbitol are a surprisingly common cause of loose stools that many people overlook. Your body can’t fully absorb them, so they sit in your intestines and pull water in, acting as osmotic laxatives. As little as 10 grams of sorbitol can cause bloating and gas in most people, and 20 grams is enough to trigger cramping and diarrhea. For reference, a single piece of sugar-free candy can contain around 3 grams, so eating a handful throughout the day adds up quickly.
Check the labels on sugar-free gum, diet candies, protein bars, and “no sugar added” products. Sorbitol, mannitol, xylitol, and erythritol are the most common culprits. If your loose stools are a recurring mystery, eliminating these from your diet for a few days is a simple diagnostic test. The diarrhea should stop promptly once you remove the offending substance.
Stay Hydrated the Right Way
Loose stools pull a significant amount of water and electrolytes out of your body. Replacing fluids is critical, but plain water alone isn’t ideal because it doesn’t replenish the sodium and potassium you’re losing. Oral rehydration solutions, broth, and diluted fruit juices are better choices. Sip steadily throughout the day rather than drinking large amounts at once, which can stimulate your gut further.
Signs of dehydration to watch for include dark urine, dry mouth, dizziness when standing, and feeling unusually fatigued. In children and older adults, dehydration can develop faster and become serious more quickly.
Over-the-Counter Options That Work
Loperamide (the active ingredient in Imodium) is the most widely used medication for stopping loose stools. It works by slowing the movement of your intestines, giving your body more time to absorb water from stool. The standard approach for adults is two caplets after the first loose bowel movement, then one caplet after each subsequent loose movement, up to a daily maximum of four tablets (or eight capsules if using the capsule form).
Loperamide is effective for garden-variety diarrhea, but you should not use it if you have a high fever, bloody or black stools, or symptoms of a bacterial gut infection. In those cases, slowing down the intestines can actually trap harmful bacteria inside your body longer.
Bismuth subsalicylate (Pepto-Bismol) is another option that can help with milder loose stools and the nausea that sometimes accompanies them. It coats the lining of your gut and has mild antimicrobial properties. It will temporarily turn your tongue and stool black, which is harmless.
Probiotics for Recurring Loose Stools
If your loose stools are linked to antibiotics or tend to recur, specific probiotic strains can help. Lactobacillus rhamnosus GG and Saccharomyces boulardii (a beneficial yeast) have the strongest evidence behind them. Lactobacillus rhamnosus GG has shown consistent positive results in treating antibiotic-associated diarrhea across multiple studies. Saccharomyces boulardii is particularly useful because, as a yeast rather than a bacterium, antibiotics don’t kill it.
Not all probiotic products contain these strains, so check the label for the specific strain name rather than just the genus. Generic “probiotic blend” supplements may not include the strains with evidence behind them. You can also get Lactobacillus rhamnosus from certain yogurts, though the concentration is lower than in supplement form.
When Loose Stools Signal Something Bigger
Acute loose stools from a virus, bad meal, or stress typically resolve within a few days. If yours don’t improve within two days, it’s time to see a doctor. Loose stools lasting longer than two weeks but less than four are classified as persistent diarrhea, and anything beyond four weeks is considered chronic. Both warrant medical evaluation because they can point to conditions like celiac disease, inflammatory bowel disease, or chronic infections.
Certain symptoms alongside loose stools need prompt attention regardless of how long they’ve been going on: a fever above 101°F (38.3°C), blood or black color in your stool, or severe abdominal pain. For children, the threshold is tighter: call a doctor if a child’s diarrhea doesn’t improve within 24 hours, or immediately if you see signs of dehydration like no wet diapers for three hours, no tears when crying, or unusual drowsiness.
A Simple Sequence to Follow
- Immediately: Switch to bland foods, increase soluble fiber, cut out caffeine and alcohol, and start replacing fluids with electrolyte-containing drinks.
- Check your diet: Eliminate sugar-free products containing sorbitol or other sugar alcohols. Remove dairy temporarily if lactose intolerance is a possibility.
- Use loperamide if needed: Take it after the first loose movement for faster relief, but stop if symptoms worsen or you develop a fever.
- Add a targeted probiotic: Especially useful if you’re on antibiotics or have recurring episodes. Look for Lactobacillus rhamnosus GG or Saccharomyces boulardii by name.
- Track the timeline: If things aren’t improving within two days, or if loose stools keep coming back every few weeks, that pattern itself is worth investigating with a doctor.