Digestive complaints like bloating, acid reflux, constipation, and gas are among the most common reasons people seek medical care. Digestive issues affect an estimated 60-70 million Americans. Ultra-processed foods account for more than half of the calories consumed in the average American diet. What you eat affects how your gut responds.

If you’re one of millions of Americans with digestive issues, checking the quality of your food can help. This article will show you how to make informed decisions that can improve gut health.

What are ultra-processed foods?

Ultra-processed foods are factory-made products. They use ingredients taken from whole foods, like refined fats, starches, and sugars. They almost always contain long ingredient lists packed with additives: artificial flavors, preservatives, emulsifiers (which stabilize texture), colorings, and sweeteners.

The term "ultra-processed" comes from the NOVA food classification system.

Nutrition researchers developed this framework.

It groups foods by how much processing they undergo. NOVA Group 4, the ultra-processed category, covers products that go well beyond basic cooking or preservation.³

Common examples of ultra-processed foods include:

• Packaged snack chips and crackers
• Ready-to-eat frozen meals and fast food
• Sweetened breakfast cereals
• Flavored yogurts with added thickeners and sugars
• Packaged and processed deli meats
• Carbonated soft drinks and flavored beverages
• Packaged bread made with more than a handful of ingredients
• Instant noodles and seasoned rice or pasta mixes

These products are not equally harmful in every amount or context. As a dietary pattern, however, reliance on them tends to crowd out fiber, whole grains, fruits, and vegetables that the gut needs to function.

How ultra-processed foods affect the digestive system

What makes ultra-processed foods hard on the digestive system comes down to two things: what they lack and what they contain in excess.

Fiber is the most direct connection. Dietary fiber feeds beneficial gut bacteria and regulates the pace at which food moves through the intestines.

Ultra-processed foods are typically low in fiber. A diet short on fiber is a cause of constipation and gut microbiome imbalances. The gut microbiome is the group of microorganisms that live in the digestive tract to support immune function.

Emulsifiers are additives used to stabilize texture in many packaged products. A 2016 study found evidence that some emulsifiers affected the protective mucosal lining in certain mice.

These emulsifiers included carboxymethylcellulose, a thickening agent, and polysorbate-80, which helps maintain texture. This resulted in inflammation, obesity and colitis.⁴ It is important to note that research is still ongoing in this area. These results do not prove that these ingredients are harmful to humans.

The body does not digest artificial sweeteners in diet sodas, sugar-free snacks, and many flavored drinks like it digests natural sugars. For some people, they ferment in the large intestine, contributing to gas and bloating.

High-fat, ultra-processed foods slow gastric emptying. This is the process where the stomach moves food into the small intestine.

When gastric emptying is delayed, the stomach stays full longer. This increases pressure and pushes stomach acid back into the esophagus. Carbonated beverages add to that internal pressure, making them another common pathway to reflux symptoms.

Everyday digestive symptoms to recognize

Many people live with digestive discomfort for months or years without connecting it to their diet. Here are the most common symptoms associated with a diet high in ultra-processed foods:

Bloating

A feeling of tightness, fullness, or visible distension in the abdomen. Sodium-heavy foods cause water retention that contributes to bloating. Fermentable additives and artificial sweeteners are also common triggers.

Gas

Excess intestinal gas forms when gut bacteria ferment poorly digestible additives and low-fiber carbohydrates found in ultra-processed products.

Acid reflux

A burning sensation in the chest or throat caused by stomach acid rising into the esophagus. When this occurs regularly it may indicate a condition called gastroesophageal reflux disease, or GERD.

Constipation

Infrequent or difficult bowel movements, most often tied to insufficient fiber intake and inadequate hydration.

General stomach discomfort

Cramping, nausea, or an unsettled feeling after eating that may point to gut microbiome imbalances, food intolerances, or sensitivity to specific additives.

If any of these symptoms interfere with your daily life, it is worth checking how much ultra-processed food you eat.

Focus on how much comes from these foods. Seek medical attention if your symptoms are severe, start suddenly, or come with unexplained weight loss. Blood in the stool is also a red flag.

How to read a label and identify ultra-processed foods

Identifying ultra-processed foods at the grocery store comes down to reading the ingredient list. Front-of-package claims like "natural," "made with whole grains," or "low fat" are marketing language and say nothing about the degree of processing.

A short list of whole-food ingredients is a positive sign. A long list containing many ingredients is an indicator that you are looking at an ultra-processed product.

Watch for these specific categories of additives:

Emulsifiers

These include carrageenan, polysorbate 80, soy lecithin, mono- and diglycerides.

Artificial sweeteners

These include aspartame, sucralose, acesulfame potassium (Ace-K), saccharin.

Artificial colors and flavors

Manufacturers label these with numbers, like Red 40, Yellow 5, and Blue 1. They may also list them as “artificial flavors.”

Preservatives

These include sodium benzoate, BHA, BHT, sodium nitrate, sodium nitrite.

Modified starches and hydrolyzed proteins

Manufacturers use these as texture agents or flavor carriers.

High-fructose corn syrup

This is a highly refined sweetener found in many packaged foods and beverages.

Simple swaps that make a real difference

Reducing ultra-processed food intake does not require a dramatic dietary overhaul. Replacing a few regular staples with less processed options can add fiber and nutrients your gut needs. It can also lower your exposure to additives that may be causing symptoms.

Packaged snack chips and crackers

• Swap: Plain nuts, seeds, or air-popped popcorn
• Digestive Benefit: More fiber and healthy fats; fewer additives

Sugary breakfast cereal

• Swap: Rolled oats or steel-cut oats with fresh fruit
• Digestive Benefit: Soluble fiber supports bowel regularity and feeds beneficial gut bacteria

Flavored yogurt with added sugar and thickeners

• Swap: Plain Greek yogurt with fresh or frozen fruit
• Digestive Benefit: Live cultures, protein, and no artificial additives

Carbonated soft drinks

• Swap: Sparkling water with sliced fruit or citrus
• Digestive Benefit: Reduces stomach pressure; removes caffeine and added sugars as reflux triggers

Packaged deli and processed meats

• Swap: Roasted chicken or turkey prepared at home
• Digestive Benefit: No sodium nitrates; significantly lower sodium and fewer preservatives

Instant noodles or seasoned rice mixes

• Swap: Whole grain pasta or brown rice with olive oil and vegetables
• Digestive Benefit: Higher fiber, less sodium, no artificial flavor enhancers

Packaged bread with long ingredient lists

• Swap: Whole grain bread with five or fewer recognizable ingredients
• Digestive Benefit: Fiber supports digestion; fewer additives overall

Processed cheese product

• Swap: Natural cheese such as cheddar, mozzarella, or feta
• Digestive Benefit: Minimal processing; natural cultures and real calcium

When to see a doctor for digestive symptoms

For many people, simple dietary adjustments can meaningfully reduce bloating, reflux, and other common digestive symptoms. For others, those same symptoms may point to an underlying condition that requires more than a diet change.

Persistent or worsening digestive problems can be signs of conditions including:

Irritable bowel syndrome (IBS)

• A functional disorder that affects how the intestines contract and move food through the digestive tract

Inflammatory bowel disease (IBD)

• A group of conditions involving chronic inflammation of the digestive tract, including Crohn's disease and ulcerative colitis

Celiac disease

• An autoimmune response to gluten that damages the lining of the small intestine

Gastroesophageal reflux disease (GERD):

• Chronic acid reflux that may cause tissue damage to the esophagus if left untreated

According to the American College of Gastroenterology, up to 20 percent of the U.S. population lives with GERD.⁵ Many people use over-the-counter antacids for years to manage symptoms. They may not know about more effective, long-term treatment options.

See a doctor promptly if you experience any of the following:

• Heartburn or reflux symptoms more than twice a week
• Difficulty or pain when swallowing
• Unintended weight loss
• Persistent nausea or vomiting
• Blood in the stool, or stools that appear black
• Abdominal pain that does not resolve on its own

If acid reflux is common for you, Texas Health offers a free, interactive assessment.

It can help you understand your symptoms and identify your risk factors.

It can also help you decide if you should see a digestive health specialist.

Texas Health's digestive health and primary care teams are ready to help you identify the cause of your symptoms and create a plan that fits your life.

Frequently asked questions

Can cutting out ultra-processed foods really reduce bloating and reflux?

Reducing ultra-processed food intake can help with bloating and reflux for many people. These foods are often high in sodium, fat, carbonation, and additives that directly contribute to these symptoms. Individual results vary, and some people have underlying conditions that require medical treatment alongside dietary changes. A physician can help determine whether dietary adjustments alone are likely to address your specific symptoms.

How long does it take to notice digestive improvements after changing my diet?

Digestive improvements after a diet change can appear in a few days or over several weeks. It depends on the changes you make and your current gut health. Adding fiber gradually and increasing water intake tends to produce earlier results for constipation and bloating. More meaningful shifts in the gut microbiome usually take a few weeks of steady diet changes to notice.

What is the difference between acid reflux and GERD?

Acid reflux is when stomach acid sometimes flows back into the esophagus. It often feels like a burning in the chest or throat.

GERD, or gastroesophageal reflux disease, is the chronic form of this condition. Diet choices can trigger or worsen both. However, GERD often needs a formal medical check and a treatment plan.

Is sparkling water a safe swap for soda if I have acid reflux?

Sparkling water is often a better choice than soda for acid reflux. It has no caffeine or added sugar. The carbonation itself can still increase stomach pressure and trigger symptoms in some people. If sparkling water seems to aggravate your reflux, plain water is the better option.

How do I know if my bloating is from my diet or something more serious?

Bloating that comes and goes in connection with specific foods is usually diet-related. Persistent bloating with pain may signal a condition that needs medical evaluation.

It may also need evaluation if you notice bowel habit changes.

Seek care if you have unexplained weight loss or blood in your stool. If your bloating does not improve with dietary changes, speaking with a physician is the right next step.

Are there ultra-processed foods that are better or worse for digestion?

Some ultra-processed products have shorter ingredient lists, less sodium, and fewer additives than others. This can make them a better choice. Plain canned beans, minimally processed whole-grain breads with short ingredient lists, and plain dairy are processed foods.

They tend to contain fewer problematic additives. That said, the healthiest approach for long-term gut health is to eat mostly whole foods. Treat ultra-processed foods as an occasional choice.

Want more information about how to improve your digestive health?

Texas Health can help. With primary care providers and digestive health specialists across North Texas, we can help you find the care you need. Find a provider online, or call 1-877-THR-WELL (847-9355).

Try our free assessment

Take this free, confidential acid reflux assessment to learn about your symptoms and risk factors:

Always consult a physician before making significant changes to your diet, especially if you have an existing health condition or are currently taking medication.

References

1. National Institute of Diabetes and Digestive and Kidney Diseases. Digestive Diseases Statistics for the United States
2. CDC. Ultra-processed Food Consumption in Youth and Adults: United States, August 2021–August 2023
3. Academy of Nutrition and Dietetics. Examining the Nova Food Classification System and the Healthfulness of Ultra-Processed Foods
4. Nature. Dietary emulsifiers impact the mouse gut microbiota promoting colitis and metabolic syndrome
5. National Institute of Diabetes and Digestive and Kidney Diseases. Definition & Facts for GER & GERD