Bloating after dinner. Gas that won’t go away. Sudden diarrhea. Constipation. Stomach cramps.

Sometimes the problem isn’t simply how much you eat. What is in the food can matter too.

Certain carbohydrates, sweeteners, additives and highly processed ingredients can cause digestive symptoms in some people. This is particularly relevant for people with irritable bowel syndrome, food intolerances or a sensitive digestive system.

But there is an important distinction: none of these ingredients automatically “destroy your gut.”

Most are considered safe when consumed within normal dietary limits. The problem is that individual tolerance varies, and some ingredients can cause significant symptoms at certain doses.

Here are 10 foods and ingredients worth paying attention to.

1. Sugar-Free Candy and Gum

Sugar-free candy sounds like a smart choice.

Less sugar. Fewer calories. Problem solved?

Not necessarily.

Many sugar-free candies, chewing gums and low-sugar products use sugar alcohols, also known as polyols.

Common examples include:

Sorbitol
Mannitol
Xylitol
Maltitol
Isomalt

These compounds can be poorly absorbed in the small intestine. When they reach the large intestine, bacteria can ferment them and produce gas. They can also draw water into the bowel.

The result can be bloating, cramps, gas and diarrhea, particularly when consumed in larger amounts.

This is why some products containing sugar alcohols carry warnings about excessive consumption having a laxative effect.

Check the label for:

Sorbitol, mannitol, xylitol, maltitol and isomalt.

If you notice digestive problems after eating several pieces of sugar-free candy or gum, the sweetener may be worth investigating.

2. Diet Soda and Artificially Sweetened Drinks

Diet soda can be useful for reducing sugar intake, but “zero sugar” doesn’t automatically mean “zero digestive impact.”

Artificial and non-nutritive sweeteners include ingredients such as:

Sucralose
Saccharin
Aspartame
Acesulfame potassium
Stevia-derived sweeteners

Research into artificial sweeteners and the gut is still evolving. Some studies suggest that certain sweeteners can affect gut microbiota and gastrointestinal processes, but human evidence is mixed and the effects appear to vary substantially between individuals.

For some people, however, the bigger problem may be the combination of sweeteners and other ingredients in heavily processed beverages.

And if your “diet” drink contains sugar alcohols, those can be particularly relevant if you experience bloating or diarrhea.

What to do

If you regularly experience digestive symptoms, try paying attention to whether symptoms change when you reduce artificially sweetened drinks.

Don’t assume every artificial sweetener is harmful. Look at your own tolerance and the overall pattern of your diet.

3. Protein Bars

Protein bars are marketed as convenient nutrition.

But some are essentially highly processed snack foods with extra protein added.

A bar might contain:

Sugar alcohols
Inulin
Chicory root fiber
Added fibers
Artificial sweeteners
Emulsifiers
Large amounts of concentrated ingredients

These ingredients aren’t necessarily bad. But consuming several different fermentable ingredients in one small bar can be a recipe for bloating in sensitive people.

Inulin and chicory root fiber, for example, are fermentable fibers that can cause gas and abdominal discomfort in some people.

Watch for this combination

High protein + low sugar + sugar alcohols + added fiber

That combination can look extremely attractive on a nutrition label while being difficult for some stomachs to tolerate.

If a protein bar repeatedly makes you feel bloated, try a simpler snack with fewer added ingredients.

4. Ice Cream and Other High-Lactose Dairy Products

For people who don’t produce enough of the enzyme lactase, lactose can be a major digestive trigger.

Lactose is the natural sugar found in milk and many dairy products.

If lactose isn’t properly digested, it can reach the large intestine, where bacteria ferment it.

This can lead to:

Gas
Bloating
Abdominal discomfort
Diarrhea

Lactose intolerance varies considerably from person to person. Some people can tolerate small amounts while others experience symptoms after relatively modest servings.

Ice cream can be particularly problematic because you may consume a substantial amount of dairy in one sitting.

Try this

If dairy repeatedly causes symptoms, compare your response to:

Regular ice cream vs. lactose-free ice cream vs. a small serving of hard cheese.

Different dairy products contain different amounts of lactose.

5. Foods With High-Fructose Sweeteners

High-fructose corn syrup has received plenty of attention for metabolic reasons, but fructose can also matter from a digestive perspective.

Some people have difficulty absorbing excess fructose, particularly when there is more fructose than glucose in the food.

High-fructose ingredients can appear in:

Soft drinks
Sweetened sauces
Desserts
Candy
Packaged baked goods
Some fruit products

Excess fructose can act as a FODMAP. In susceptible people, poorly absorbed fructose can draw water into the intestine and contribute to fermentation and gastrointestinal symptoms.

This doesn’t mean fructose is inherently bad.

Whole fruit, for example, can be an excellent part of a healthy diet.

The issue is more about dose, food form and individual tolerance.

6. Onion and Garlic

This might be surprising because onions and garlic are generally considered nutritious foods.

But they are also rich in fructans, a type of carbohydrate belonging to the FODMAP family.

Fructans are not fully digested in the small intestine. They reach the large intestine, where bacteria ferment them and produce gas.

For people with IBS, this can contribute to:

Bloating
Abdominal pain
Gas
Diarrhea
Constipation

Monash University identifies onions, garlic, wheat, rye and certain legumes as important sources of fructans and other FODMAP carbohydrates.

The important part

You don’t need to assume that onions and garlic are unhealthy.

For most people, they’re perfectly reasonable foods.

But if you’re experiencing unexplained bloating, they’re worth considering as part of the bigger picture.

7. Wheat-Based Foods

Bread, pasta, cereal and other wheat products can cause digestive symptoms in some people.

But the explanation isn’t always gluten.

Wheat contains fructans, which are fermentable carbohydrates and FODMAPs.

This means someone may experience digestive symptoms from certain wheat-based foods without necessarily having celiac disease or a gluten allergy.

For people with IBS, fructans can be an important trigger.

This is one reason why simply blaming “gluten” for every digestive problem can be misleading.

What to consider

If wheat products cause symptoms, don’t immediately self-diagnose a gluten disorder.

Persistent symptoms should be discussed with a healthcare professional, particularly before eliminating gluten because doing so can interfere with testing for celiac disease.

8. Cashews and Pistachios

Nuts have a deserved reputation as nutritious foods.

They’re sources of healthy fats, protein, fiber and micronutrients.

But not every nut has the same FODMAP profile.

Monash University lists cashews and pistachios among higher-FODMAP nuts, while options such as peanuts and macadamias are generally lower in FODMAPs at appropriate serving sizes.

For someone with IBS, eating a large portion of cashews can therefore produce a very different digestive response from eating a small portion of peanuts.

The lesson

Healthy doesn’t automatically mean unlimited.

Even highly nutritious foods can trigger symptoms when the dose exceeds your individual tolerance.

9. Processed Foods With Emulsifiers

Now we get into the ingredients that sound like they came straight from a chemistry textbook.

Emulsifiers are used to help ingredients that normally separate stay mixed together.

Examples include:

Carboxymethylcellulose
Polysorbate 80
Certain gums and stabilizers
Other emulsifying or thickening agents

Some experimental and early human research suggests that particular emulsifiers may influence gut microbiota and intestinal processes. Research has also raised questions about their potential role in inflammation and gut barrier function.

But this area needs nuance.

It would be wrong to say:

“Emulsifiers destroy your gut.”

The human evidence is still developing, and not all emulsifiers have the same effects.

A better takeaway is that regularly consuming large amounts of ultra-processed foods containing multiple additives is worth limiting as part of an overall healthy eating pattern.

10. Ultra-Processed Foods

This may be the biggest category of all.

Think about foods such as:

Packaged snack cakes
Processed desserts
Certain frozen meals
Sugary cereals
Packaged snack foods
Some fast-food products
Highly processed meat products

These foods can contain combinations of refined carbohydrates, added sugars, fats, emulsifiers, sweeteners, flavorings and other additives while providing relatively little fiber.

Recent research has found associations between higher ultra-processed food consumption and gastrointestinal disorders such as IBS and functional dyspepsia, although researchers emphasize that the evidence is still developing and observational studies cannot prove that ultra-processed foods directly cause these conditions.

That distinction matters.

It’s probably not one mysterious chemical destroying your digestive system.

It may be the overall dietary pattern.

A diet dominated by highly processed foods can simultaneously mean:

Less fiber + more additives + more refined carbohydrates + more sugar + less dietary diversity.

That’s a very different situation from occasionally eating a packaged snack.

So Which Ingredients Should You Actually Watch?

If you’re trying to identify possible digestive triggers, start with these names on food labels:

Ingredient or compound	Where you may find it	Possible issue
Sorbitol	Sugar-free candy, gum	Gas, bloating, diarrhea
Mannitol	Sugar-free products	Gas, bloating, diarrhea
Xylitol	Gum, candy, drinks	Gas, bloating, diarrhea
Maltitol	Protein bars, candy	Gas, bloating, diarrhea
Inulin	Protein bars, cereals, fiber products	Gas and bloating
Chicory root fiber	Protein bars, cereals	Gas and bloating
Excess fructose	Sweetened drinks, honey, some processed foods	Bloating and GI symptoms in susceptible people
Lactose	Milk, ice cream, dairy	Gas, bloating, diarrhea in lactose intolerance
Fructans	Wheat, onions, garlic	Bloating and gas in susceptible people
Certain emulsifiers	Ultra-processed foods	Gut effects are an emerging research area

Your Gut Doesn’t Hate Chemicals

There’s an important misconception worth clearing up.

“Chemical” does not automatically mean dangerous.

Water is a chemical.

Vitamin C is a chemical.

Salt is made of chemicals.

Food additives are regulated for use, and the presence of an unfamiliar ingredient on a label doesn’t automatically mean the food is dangerous.

The more useful question is:

Does this particular ingredient or food cause symptoms for me, at the amount I’m consuming?

That’s a much better approach than trying to eliminate every ingredient with a complicated name.

How to Find Your Personal Triggers

If you’re experiencing recurring digestive symptoms, don’t randomly eliminate 20 foods at once.

You’ll have no idea what actually helped.

Instead, consider keeping a simple food and symptom diary.

Record:

What you ate → approximate portion → time → symptoms → severity

Look for patterns over several days or weeks.

If you repeatedly notice symptoms after the same ingredient, discuss the pattern with a doctor or registered dietitian.

For people with IBS, a structured low-FODMAP approach can sometimes help identify specific carbohydrate triggers. It is generally intended as a structured process rather than a permanent restriction of every high-FODMAP food.

When Digestive Symptoms Need Medical Attention

Don’t assume persistent digestive problems are simply a food intolerance.

Talk to a healthcare professional if you have recurring or unexplained:

Blood in the stool
Unintentional weight loss
Persistent vomiting
Severe or worsening abdominal pain
Persistent diarrhea
Persistent constipation
Difficulty swallowing
Symptoms that repeatedly wake you from sleep
A significant change in bowel habits

Food can influence digestion, but persistent symptoms deserve proper evaluation.

The Bottom Line

There isn’t a single ingredient that is secretly “destroying” everyone’s gut.

Your digestive system is much more complicated than that.

But certain foods and ingredients can absolutely cause problems for susceptible people.

The biggest suspects include sugar alcohols, excess fructose, lactose, fructans, certain fermentable fibers and some additives found in heavily processed foods.

If your stomach regularly feels bloated, uncomfortable or unpredictable, don’t just accept it as normal.

Start paying attention to what you’re eating, how much you’re eating and what happens afterward.

Your own food patterns may tell you more than a viral list of “toxic ingredients” ever will.

10 Foods and Ingredients That May Be Messing With Your Gut