Buttered Popcorn and Diarrhea
Updated on July 31, 2025
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Buttered popcorn and diarrhea aren't typically related, but there are reasons why indulgence in this snack might cause someone to experience gastrointestinal issues, though this is uncommon.
If you notice diarrhea after eating popcorn, there are several things to consider in order to figure out if it’s the reason behind this symptom or if something else is the cause. Read on to learn more.
Popcorn Is a Type of Fiber
Popcorn contains a good amount of fiber. One standard portion of oil-popped white popcorn with salt added is 3 cups, which usually contains 3.3 grams (g) of total dietary fiber. Similarly, a serving of air-popped popcorn has about 15 percent the daily fiber needed by most people.
There are two types of fiber: insoluble and soluble. Popcorn is considered to be a whole grain, which falls under the insoluble category. Too much insoluble fiber can cause diarrhea in people living with gastrointestinal conditions.
Butter May Be to Blame
It's possible that the butter, rather than the popcorn, is the reason behind diarrhea. Dairy products that contain lactose, like butter, can cause diarrhea if you’re lactose intolerant.
The butter topping on your popcorn is also high in fat — one serving of butter contains 7 g of saturated fat, and the American Heart Association recommends no more than 13 g per day.
A meal or snack that’s high in fat — or large amounts of food in general when eaten all at once — can also cause diarrhea in people living with gastrointestinal conditions.
Other Potential Causes
Diarrhea could be caused by food poisoning, which is often the result of contamination from a bacteria such as E. coli or salmonella.
Artificial butter flavorings have been shown to increase intestinal motility and cause diarrhea in animal studies when given at high doses.
It’s also possible that your diarrhea isn't related to a session with buttered popcorn at all — it can be a symptom of other conditions or a side effect of medication.
When to See a Doctor
Talk with your doctor if your diarrhea doesn't stop or improve after two days or if you experience any of the following as a result of diarrhea.
- Dehydration
- Abdominal or rectal pain
- Bloody or black stools
- Fever above 101 degrees F
You should talk with your doctor if you have lactose intolerance. You can also try avoiding foods and drinks that are sources of lactose to see if diarrhea or other lactose intolerance symptoms disappear.
The Takeaway
- Diarrhea isn't common in most people after they eat buttered popcorn.
- If you experience diarrhea after eating buttered popcorn, there could be several reasons why.
- Diarrhea can be caused by too much fiber, lactose intolerance, and food poisoning. It can also be a side effect of medication.
- Talk with your doctor if you experience diarrhea that lasts more than two days or if additional symptoms, like dehydration, also appear.
Resources We Trust
- Cleveland Clinic: Stool Changes and What They Mean
- U.S. Department of Agriculture: Snacks, Popcorn, Oil-Popped, White Popcorn, Salt Added
- Mayo Clinic: Lactose Intolerance
- Centers for Disease Control and Prevention: Symptoms of Food Poisoning
- American Heart Association: Saturated Fat
EDITORIAL SOURCES
Everyday Health follows strict sourcing guidelines to ensure the accuracy of its content, outlined in our editorial policy. We use only trustworthy sources, including peer-reviewed studies, board-certified medical experts, patients with lived experience, and information from top institutions.
Resources
- Snacks, Popcorn, Oil-Popped, White Popcorn, Salt Added. U.S. Department of Agriculture. April 1, 2019.
- Hess J. Popcorn: A Healthy, Whole Grain Snack. U.S. Department of Agriculture. September 11, 2023.
- Nutritional Information. Popcorn.org.
- Fiber and Lactose. University of California San Francisco.
- TF Malik et al. Lactose Intolerance. StatPearls. April 17, 2023.
- Saturated Fat. American Heart Association. August 23, 2024.
- Butter: Nutrition Facts and Benefits. U.S. Dairy.
- Bonci L. Diet – An Important 1st Step in IBS Treatment. International Foundation for Gastrointestinal Disorders.
- Symptoms of Food Poisoning. Centers for Disease Control and Prevention. January 31, 2025.
- Nunes NMF et al. In Vitro and In Vivo Acute Toxicity of an Artificial Butter Flavoring. Journal of Toxicology and Environmental Health. March 19, 2023.
- Diarrhea. Mayo Clinic. January 18, 2025.
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