Most people have digestive problems at some point, whether it’s bloating after a meal, heartburn, constipation, gas, or stomach discomfort.

What you eat plays an important role in your digestive health, supporting regular digestion and a healthy gut.

What Is Digestion?

Digestion is the process your body uses to turn food into nutrients it absorbs and uses for energy, growth, and repair.

Digestion starts in the mouth, where chewing and saliva break down food into smaller pieces. Food then travels through the esophagus into the stomach, where stomach acid and digestive enzymes continue breaking food down.

From there, food moves into the small intestine, where the bloodstream absorbs most nutrients. The large intestine absorbs water and removes waste from the body.

So, your stomach, intestines, liver, pancreas, and gallbladder all work together to support digestion.

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What Supports Healthy Digestion?

Healthy digestion depends on more than just avoiding certain foods. Digestive health varies from person to person. Certain health conditions, medications, or food intolerances affect digestion.

Many factors support your digestive system, including:

  • Fiber — Moves waste through the digestive tract and supports regular bowel movements.
  • Gut bacteria — The digestive tract contains trillions of microorganisms, called the gut microbiome, that break down food and support digestive health.
  • Physical activity — Stimulates digestion and reduces constipation.
  • Water — Softens stool and helps food move through the intestines.

How Food Affects Digestion

The foods you eat affect how quickly they move through the digestive tract. They also impact how comfortable you feel after a meal and your overall digestive system function.

Some foods provide fiber, water, and nutrients that support digestion. Other foods are harder for the body to break down or irritate the digestive tract. This leads to symptoms like bloating, gas, constipation, diarrhea, or heartburn.

What causes digestive issues for one person may not affect other people. After you eat, pay attention to your symptoms to figure out which foods impact your digestion.

Foods That May Upset Your Digestive System

Certain foods are more likely to cause digestive discomfort — especially if you have a sensitive stomach, food intolerance, or a digestive condition.

Fried and high-fat foods

Fried foods and foods high in saturated fats take longer to digest and can contribute to bloating, stomach discomfort, or acid reflux. Large amounts of these foods also slow stomach emptying, leaving some people feeling overly full. Common foods high in fat include:

  • Fast food meals.
  • French fries.
  • Fried chicken.
  • Heavy cream sauces.
  • Processed meats.

You don’t have to avoid these foods entirely, but eating them in moderation can help reduce digestive discomfort.

Ultra-processed foods

Ultra-processed foods have been heavily altered from their original form. These foods are often high in added sugar, sodium, or unhealthy fats while being low in fiber.

A diet high in ultra-processed foods can contribute to constipation or changes in gut bacteria. Many packaged and convenience foods fall into this category, including:

  • Breakfast cereals.
  • Chips.
  • Packaged snacks.
  • Processed lunch meats.
  • Sugary soft drinks.

Spicy foods

Spicy foods can trigger digestive symptoms, especially if you’re prone to acid reflux or heartburn.

Tolerance for spicy foods varies widely. Some people eat spicy foods regularly without digestive problems. But hot peppers and spicy sauces may irritate the digestive tract or increase stomach discomfort in sensitive people.

Foods that often contain large amounts of spice include:

  • Buffalo wings.
  • Chili peppers.
  • Hot sauces.
  • Spicy curries.
  • Spicy snack foods.

Artificial sweeteners

Some sugar substitutes can cause digestive symptoms, particularly when consumed in large amounts. Certain artificial sweeteners and sugar alcohols aren’t fully absorbed by the body, which leads to gas, bloating, or diarrhea.

Sugar substitutes commonly found in sugar-free products include:

  • Mannitol — Sugar alcohol often used in chewing gum, candies, and medications.
  • Sorbitol — Sugar alcohol frequently added to sugar‑free gums, mints, and processed foods. It can have a mild laxative effect in larger amounts.
  • Xylitol — Popular sweetener in sugar‑free gum and dental products.

Alcohol and caffeinated drinks

Alcohol and caffeinated beverages differ in how they impact digestion. Both can trigger symptoms depending on your sensitivity, meaning not everyone reacts to these drinks the same way. Some people don’t have problems at all, while others notice symptoms even after small amounts.

Common beverages that may cause digestive symptoms include:

  • Alcoholic drinks.
  • Coffee.
  • Energy drinks.
  • Highly caffeinated teas.
  • Soda.

Alcohol irritates the lining of the stomach and intestines, causing inflammation and discomfort. It also contributes to dehydration, making constipation worse and stool harder to pass.

Heavy or frequent drinking can also disrupt the balance of healthy bacteria in your gut, affecting overall digestive function. Sugary or carbonated alcoholic drinks may also increase bloating or acid reflux.

Caffeine speeds up movement through the digestive tract. This can cause loose stools or diarrhea in some people. Coffee, in particular, increases stomach acid production, which may trigger heartburn or acid reflux.

Dairy products

Some people have lactose intolerance, meaning they have trouble digesting lactose, a natural sugar found in milk and dairy products. Being lactose intolerant causes gas, bloating, cramping, or diarrhea after eating dairy foods.

Some people with lactose intolerance can tolerate small amounts of dairy. Dairy products that commonly contain lactose include:

  • Ice cream
  • Milk
  • Soft cheeses
  • Yogurt

Foods That Support Healthy Digestion

Eating a range of nutrient-rich foods can help your digestive system break down and absorb nutrients properly. Since these foods also promote healthy gut bacteria, they may naturally reduce digestive discomfort.

High-fiber foods

Fiber adds bulk to stool and helps food move through the digestive tract, supporting regular bowel movements. It also feeds beneficial gut bacteria, which play an important role in digestive health.

There are two main types of fiber that support digestion in different ways. Many plant foods contain a mix of both types:

  • Insoluble fiber — Adds bulk to stool and helps food move more efficiently through the intestines. Foods rich in insoluble fiber include brown rice, leafy greens, nuts, and whole wheat bread.
  • Soluble fiber — Absorbs water and forms a gel-like substance in the digestive tract, softening stool and supporting healthy digestion. Foods rich in soluble fiber include apples, beans, oats, and pears.

Adding too much fiber too quickly sometimes causes gas or bloating. Increase fiber gradually and drink enough water to reduce discomfort.

Fermented foods and probiotics

Fermented foods contain healthy bacteria called probiotics, which support balance in the gut microbiome. These bacteria break down food, support digestion, and help the body absorb nutrients. Some fermented foods also contain beneficial compounds created during fermentation that support gut health.

Fermented foods rich in probiotics include:

  • Kefir
  • Kimchi
  • Sauerkraut
  • Yogurt

Not all yogurts contain the same amount or types of healthy bacteria. Highly processed or heavily sweetened yogurts may contain fewer beneficial bacteria than plain varieties labeled with “live and active cultures.”

Hydrating foods

Hydration is important for digestion. Water softens stool, helps food move through the digestive tract, and prevents constipation.

Some foods contain large amounts of water along with fiber and nutrients. Eating hydrating foods alongside drinking enough fluids improves digestion, including:

  • Apples
  • Berries
  • Cucumbers
  • Leafy greens
  • Melons

Lean proteins

While high-fat meats can slow digestion, lean proteins are often easier to process. Cooking methods also matter. Baked, grilled, or steamed proteins are easier to digest than heavily fried options.

Choose a variety of lean proteins, including:

  • Chicken breast
  • Eggs
  • Fish
  • Tofu
  • Turkey

Ginger and peppermint

For centuries, people have used ginger and peppermint as remedies for digestive discomfort. Ginger may help with nausea and upset stomach, while peppermint may relieve bloating or indigestion.

People commonly consume ginger and peppermint as:

  • Herbal teas.
  • Seasonings in meals.
  • Supplements.

Peppermint doesn’t work well for everyone, though. People with acid reflux may notice that it worsens heartburn symptoms.

Healthy Habits That Support Digestion

Digestive symptoms aren’t always caused by a single food. Eating patterns, stress, hydration, sleep, and physical activity all affect digestion.

But small, routine changes can improve bloating, constipation, and other digestive symptoms. Healthy habits that support digestion include:

  • Chewing food thoroughly.
  • Drinking enough water.
  • Eating regular meals.
  • Eating slowly and mindfully.
  • Getting regular physical activity.
  • Managing stress.
  • Not lying down right after a meal.

When To Talk to a Provider About Digestive Symptoms

Occasional digestive discomfort is common, but don’t ignore ongoing symptoms — they can point to an underlying condition that requires treatment.

To identify foods or habits that contribute to discomfort, keep a food journal or pay attention to symptoms after meals. Talk to a provider if digestive symptoms are severe, happen often, interfere with your daily life, or include:

  • Blood in your stool.
  • Persistent diarrhea or constipation.
  • Severe abdominal pain.
  • Trouble swallowing.
  • Unexplained weight loss.

Mengxiao Yang, Zhi Yang, David W. Everett, Elliot Paul Gilbert, Harjinder Singh, Aiqian Ye. Clinical Reviews in Food Science and Nutrition. Digestion of food proteins: the role of pepsin. Accessed May 2026. https://www.tandfonline.com/doi/full/10.1080/10408398.2025.2453096. Link.

Mehrana Allahverdi, Mehdi Dadmehr. Journal of Food Composition and Analysis. Probiotic innovation: From next-generation strains and advanced encapsulation strategies to probiotic engineering. Accessed May 2026. https://www.sciencedirect.com/science/article/pii/S0889157526000608. Link.

About UPMC Nutrition Services

Nutrition is vital for maintaining your overall health. UPMC Nutrition Services offers comprehensive diet and nutrition counseling on a variety of topics, including eating disorders, weight management, and heart disease. Our team provides medical nutrition therapy for chronic conditions such as celiac disease, cancer, and diabetes. UPMC’s network of registered dietitians is available to help guide all patients toward a healthier life.