Why Do I Get Diarrhea After Eating

Why Do I Get Diarrhea After Eating? Causes and Treatment

Do you frequently experience diarrhea following your meals? If so, you might be dealing with a condition known as postprandial diarrhea. This condition can manifest as either acute or chronic, and it can be rather uncomfortable and disruptive in either case.

Postprandial diarrhea can be attributed to various underlying factors. Consequently, selecting an effective treatment hinges on identifying and mitigating the root cause, and that is precisely the aim of this article – to assist you in this endeavor.

How Frequently Does Diarrhea Occur After Eating?

Postprandial diarrhea is not an unusual occurrence. However, its prevalence varies depending on the underlying causes, given that it serves more as a symptom rather than a standalone ailment.

Diarrhea subsequent to a meal may be attributed to a variety of factors, such as lactose intolerance, specific medications, or chronic conditions like dumping syndrome, irritable bowel syndrome (IBS), and microscopic colitis, among others.

MUST READ: How to Stop Diarrhea Every Morning | Here’s The Answer

To provide some context, approximately 3 million adults in the United States contend with inflammatory bowel disease (IBD), a condition that can incite this discomforting experience. Similarly, around 1 in 6 individuals endure food poisoning annually, while 19 to 21 million Americans grapple with stomach flu or viral gastroenteritis each year.

The Acute Diarrhea After Eating: What Causes It?

Acute diarrhea, lasting 1–2 days, can develop due to various factors. For instance, diarrhea following a meal may signal food poisoning. If you frequently experience post-meal diarrhea, it’s likely linked to a food allergy.

Here are the common factors responsible for causing diarrhea:

Food Poisoning

One of the primary causes of food poisoning is the consumption of contaminated food. Bacteria, viruses, parasites, or other harmful organisms can contaminate food. Once these organisms enter your digestive system, they can lead to acute diarrhea.

Symptoms of food poisoning extend beyond watery stools and may include abdominal pain, cramps, nausea, vomiting, and fever.

The onset and duration of these symptoms depend on the specific pathogen ingested. For instance, food poisoning caused by staphylococcus aureus (S. aureus) can occur within 30 minutes to 8 hours after eating.

Food Intolerance

Certain individuals have digestive systems that struggle to process particular foods, resulting in food intolerance. The most common form is lactose intolerance, which involves the inability to digest lactose, a sugar found in dairy products.

Approximately 68% of the global population is affected by lactose intolerance. When these individuals consume dairy products, they may experience gastrointestinal discomfort, including acute diarrhea.

Apart from lactose, individuals might also have an intolerance to gluten, caffeine, amines, sulfites, and fructose. While symptoms can vary, food intolerance typically leads to diarrhea, flatulence, vomiting, a sense of fullness, nausea, and abdominal pain.

Viral Infections

Viral gastroenteritis, often referred to as stomach flu, results from viral infections, commonly caused by norovirus and rotavirus. This condition heightens the sensitivity of your digestive tract, leading to acute diarrhea and vomiting.

Symptoms stemming from viral infections usually resolve within a few days, but diarrhea may persist slightly longer.


Several parasites can induce diarrhea after eating. Common parasites responsible for foodborne illnesses include Entamoeba histolytica, Cryptosporidium enteritis, and Giardia lamblia.

Notably, symptoms associated with parasitic infections, including loose stools, typically do not resolve until a healthcare professional diagnoses and eliminates the parasite.

Parasite-induced diarrhea is relatively rare in developed countries. Typically, people contract these infections while traveling abroad and consuming food contaminated by parasites. These infections pose a significant health burden in African, Asian, and Latin American countries.

Certain Medications and Supplements

Occasionally, individuals may experience diarrhea after taking specific medications like antacids and antibiotics. This is likely due to the disruption of the normal functioning of the gastrointestinal tract.

For example, certain medications like laxatives and some antacids containing magnesium can stimulate the secretion of fluids into the intestine, resulting in acute diarrhea.

It’s important to note that not everyone will experience diarrhea as a side effect of taking medications or supplements. Additionally, the severity of symptoms may vary from person to person and tends to resolve when you discontinue the medications.

Toddler’s Diarrhea

As the name implies, toddler diarrhea is a form of chronic nonspecific diarrhea that occurs in children aged 6 months to 5 years. While the exact cause is not well understood, several factors are believed to trigger this condition.

Firstly, toddler diarrhea often arises in children who consume excessive amounts of fruit juices and sweetened beverages. The high sugar content draws water into the intestine, resulting in watery stools.

Another theory is that toddler diarrhea occurs in children with a fast gut transit time. In simpler terms, food moves through their digestive system rapidly, leaving less time for proper water absorption.

Chronic Diarrhea After Eating: What Causes It?

Chronic diarrhea, lasting for more than 4 weeks and characterized by three or more watery bowel movements daily, can be triggered by a wide range of factors. It may also serve as a symptom of underlying health conditions, such as hormonal disorders (diabetes, hyperthyroidism, etc.), irritable bowel syndrome, or inflammatory bowel disease.

Irritable Bowel Syndrome (IBS)

Irritable bowel syndrome (IBS) affects nearly 10–15% of people worldwide, making it the most common disorder of the large intestine. Rather than being a single disease, IBS encompasses a group of gastrointestinal symptoms, including postprandial diarrhea (IBS-D) or constipation (IBS-C), along with symptoms like abdominal cramps, changes in bowel movement, bloating, lethargy, and heartburn.

While the precise cause of IBS remains not fully understood, it is believed to result from an interplay of factors like stress, dietary changes, certain foods, and medications. If you have IBS, you might experience loose stools, infrequent bowel movements, and difficulty controlling the urge to defecate.

Crohn’s Disease

Crohn’s disease, a chronic inflammatory bowel disease (IBD), is characterized by inflammation in the lining of the gastrointestinal tract. While it can affect any part of the digestive tract, it is most commonly found in the intestines. Symptoms associated with Crohn’s disease vary in severity from person to person, with diarrhea after eating, abdominal pain, reduced appetite, weight loss, fatigue, and even blood in stools.

Regarding postprandial diarrhea linked to Crohn’s disease, the duration of watery bowel movements after eating varies. Some individuals report experiencing diarrhea immediately after a meal, while others do not observe any connection between their diet and chronic diarrhea.

Celiac Disease

Celiac disease is an autoimmune disorder where the consumption of gluten-containing foods, found in grains like wheat, barley, and rye, triggers an abnormal immune response aimed at the intestine, causing damage. Chronic diarrhea associated with celiac disease often presents with a foul odor, and the stools tend to float rather than sink.

Approximately 2 million people in the US are affected by celiac disease, and the primary treatment approach is adhering to a strict gluten-free diet. Individuals with celiac disease should scrutinize food labels when dining out or purchasing packaged products since gluten may be present in unexpected food items.

Gallbladder Removal

The gallbladder, a small organ beneath the liver, stores and concentrates bile, a crucial digestive fluid. When you consume food, especially fatty foods, the gallbladder releases bile into the small intestine to aid in digestion and dietary fat absorption.

In cases where gallstones form in the gallbladder, causing severe pain, healthcare professionals often recommend gallbladder removal surgery or cholecystectomy. Without the gallbladder, the liver’s bile flows directly into the small intestine, acting as a laxative, resulting in watery stools and frequent bowel movements.

Typically, post-gallbladder removal diarrhea resolves within a few days or weeks following the surgery. Nevertheless, some individuals continue to experience chronic diarrhea for an extended period.

Dumping Syndrome

Dumping syndrome is a digestive disorder that develops after specific types of surgeries, such as bariatric or weight loss surgery. It occurs when food moves too rapidly through the intestine, leading to frequent bowel movements. Dumping syndrome is categorized into early and late dumping. The former involves experiencing diarrhea within 15–30 minutes after eating, while the latter is characterized by diarrhea occurring 1–3 hours after a meal.

Dumping syndrome, also referred to as rapid gastric emptying, is primarily triggered by the consumption of foods high in sugar, resulting in the stomach emptying into the small intestine faster than usual.

Microscopic Colitis

Microscopic colitis involves inflammation of the colon or large intestine, leading to frequent diarrhea. Diagnosis of this condition typically involves tissue microscopy, from which it derives its name. There are two types of microscopic colitis: collagenous colitis (characterized by the formation of a thick layer of collagen in the colon) and lymphocytic colitis (involving the development of lymphocytes on the large intestine tissue).

Chronic diarrhea stemming from microscopic colitis may occur immediately after eating and may not improve with ongoing treatment. In addition to watery stools, other symptoms of microscopic colitis include abdominal pain, weight loss, fatigue, and an inability to control bowel movements, among other issues.

How to Stop Diarrhea After Eating: Prevention & Treatment

Dealing with acute postprandial diarrhea, while not severe, can often be managed effectively at home. The following strategies encompass a combination of measures to alleviate this condition: avoiding trigger foods, ensuring ample hydration, and considering over-the-counter medications as a last resort.

  1. Maintain Hydration

When confronted with diarrhea following a meal, the rapid passage of food through the gastrointestinal tract leaves minimal time for fluid and mineral absorption. This can result in dehydration, accompanied by symptoms such as dizziness, dry mouth, and weakness.

The most effective means of replenishing lost fluids is to drink copious amounts of water. Alternatively, clear soups, broth, diluted fruit juices, herbal teas, or rice water can also help. For digestive comfort, ginger ale proves particularly soothing.

Oral rehydration solutions (ORS), consisting of a blend of water, sugar, and salt, are excellent for restoring lost fluids and electrolytes. These can be acquired from local drugstores or prepared at home by combining sugar and salt in clear water. It’s crucial, however, to steer clear of caffeine, alcohol, soda, and sugary beverages, as they may exacerbate gastrointestinal symptoms.

  1. Embrace BRAT Foods

The BRAT diet, comprising Banana, Rice, Applesauce, and Toast, is a diet highly recommended by experts for addressing acute diarrhea in a home setting. These foods are characterized by their bland nature, low fiber content, and high starch levels, making them easily digestible and conducive to binding stools.

It’s important to note that the BRAT diet is not nutritionally comprehensive; it’s designed to provide respite to your digestive system and alleviate postprandial diarrhea symptoms. As such, this diet should only be adhered to for a brief period, typically ranging from 24 to 48 hours.

  1. Steer Clear of Trigger Foods

The diarrhea experienced after a meal may be triggered by various factors, including food intolerance, food poisoning, and viral infections. In the presence of diarrhea, it’s advisable to opt for bland foods and avoid those known to exacerbate symptoms. This may encompass dairy products, particularly if lactose intolerant, as well as fatty and spicy foods. Additionally, it’s prudent to avoid gas-inducing items like lettuce, legumes, broccoli, and Brussels sprouts.

  1. Integrate Probiotics

Gut microbiota imbalances resulting from conditions such as irritable bowel syndrome, sugar malabsorption, antibiotic use, or viral infections can potentially lead to postprandial diarrhea. In such cases, restoring microbial balance in the gut can be a beneficial course of action.

Probiotics, which are microorganisms beneficial for gut health, play a pivotal role in proper digestion and overall well-being. They are available in supplement form designed to alleviate diarrhea, and can also be sourced from food items such as yogurt, kimchi, kombucha, and sourdough bread.

  1. Consult a Healthcare Professional for Antibiotics

While antibiotics can offer relief, they are not typically the first-line treatment for postprandial diarrhea. Antibiotics are only warranted if bacterial infections are determined as the causative factor for diarrhea. In these instances, antibiotics should always be prescribed by a qualified healthcare provider.

  1. Consider Food Allergies

If you have, or suspect you have, food allergies or intolerances, it is advisable to eliminate trigger foods from your diet. Common allergens include nuts, dairy products, eggs, shellfish, and gluten. When dining out, always scrutinize food labels and inquire about ingredients to ensure you avoid potential triggers. However, a comprehensive assessment by a healthcare professional is imperative for identifying potential triggers.

  1. Prioritize Food Safety

Adhering to stringent hygiene during food preparation and handling is essential for averting foodborne illnesses. Thoroughly washing your hands with soap and warm water before cooking or consuming food can reduce the risk of diarrheal diseases by up to 40%, according to the Centers for Disease Control and Prevention (CDC).

Additionally, regular cleaning of kitchen surfaces, utensils, and cutting boards is essential. Ensuring that food items are stored at appropriate temperatures is crucial to prevent spoilage and foodborne illnesses.

  1. Manage Stress

Occasionally, postprandial diarrhea may be triggered by stress. When you’re stressed, your brain releases hormones that can precipitate changes in your gastrointestinal system.

If you suspect that stress is a contributing factor to your watery bowel movements, consider adopting relaxation techniques, such as deep breathing exercises, yoga, meditation, or the use of mental health apps that provide support in this regard.

  1. Explore Over-the-Counter Options

While it is important to seek medical attention if postprandial diarrhea persists or becomes severe, over-the-counter (OTC) medications can provide relief for milder cases.

Commonly used anti-diarrheal medications include loperamide (Imodium), bismuth subsalicylate (Kaopectate or Pepto-Bismol), and diphenoxylate-atropine (Lomotil). It is important to note, however, that these medications should not be used in the presence of a fever or if blood is detected in the stool. In such cases, prompt consultation with a healthcare professional is recommended.

You should also read that these reviews that we wrote about gut health supplements that may help with Diarrhea After Eating.

  1. Garden of Life Probiotics
  2. Makepoop
  3. Nucific Bio X4
  4. Dr. Stephen Sinatra Cardiosense Probiotic
  5. YourBiology Probiotic

Diarrhea After Eating: When to Consult a Physician

Acute diarrhea typically resolves independently within a few days. The NIDDK advises seeking medical attention if you observe any of the subsequent symptoms:

  • Presence of blood or pus in stools
  • Experiencing severe abdominal pain or rectal discomfort
  • Running a fever of 102 degrees Fahrenheit or higher
  • Suffering from severe dehydration, indicated by symptoms like a dry mouth and throat, dizziness, and reduced urine output
  • Enduring persistent diarrhea for over two days
  • Having bowel movements 6 or more times in a 24-hour period

Key Takeaway

Postprandial diarrhea can result from a variety of factors, including specific foods, infections, and severe gastrointestinal conditions. In addition to causing loose, watery stools, it may also lead to associated symptoms such as abdominal cramps, pain, flatulence, bloating, and nausea.

It is crucial to seek guidance from a healthcare professional if your diarrhea persists for more than five days or if you experience symptoms such as fever, blood in your stool, or dehydration. They will offer a precise diagnosis and suggest appropriate medical treatment.


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