As a nutritionist, one of the most common questions I hear from clients struggling with digestive issues is:
"Why does my stomach hurt when I'm eating healthy foods?"
It's a fair question.
Many people are surprised to learn that foods often considered healthy—such as apples, onions, garlic, beans, and even avocados—can trigger symptoms like bloating, gas, abdominal pain, diarrhea, or constipation in certain individuals.
One possible explanation is something called FODMAPs.
If you've never heard of FODMAPs before, don't worry. The name sounds far more complicated than the concept itself.
Understanding FODMAPs can be a valuable tool for people struggling with digestive discomfort, especially those diagnosed with Irritable Bowel Syndrome (IBS), Small Intestinal Bacterial Overgrowth (SIBO), or other functional digestive disorders.
What Does FODMAP Mean?
FODMAP is an acronym for:
Fermentable
Oligosaccharides
Disaccharides
Monosaccharides
And
Polyols
These are specific types of carbohydrates that are poorly absorbed in the small intestine.
When they aren't fully absorbed, they travel to the large intestine where gut bacteria ferment them. This fermentation process produces gas and draws water into the intestines.
For some people, this can result in symptoms such as:
- Bloating
- Gas
- Abdominal pain
- Cramping
- Diarrhea
- Constipation
- Stomach distension
- Digestive discomfort after meals
Why Do Some People React to FODMAP Foods?
Not everyone is sensitive to FODMAPs.
Many people can eat these foods without any digestive issues at all.
However, individuals with IBS, SIBO, gut dysbiosis, impaired digestion, or a sensitive digestive tract may experience significant symptoms when consuming larger amounts of FODMAP-containing foods.
What is important to understand is that FODMAP foods are not "bad" foods.
In fact, many are incredibly nutritious.
The issue is often not the food itself—it may be an underlying digestive imbalance that makes these foods difficult to tolerate.
The Five Categories of FODMAPs
1. Oligosaccharides
These include fructans and galacto-oligosaccharides (GOS) - short chains of sugar molecules that some people have difficulty digesting.
Common foods include:
- Garlic
- Onions
- Shallots
- Leeks
- Wheat
- Rye
- Barley
- Chickpeas
- Lentils
- Kidney beans
2. Disaccharides
The primary concern here is lactose.
Common foods include:
- Cow's milk
- Ice cream
- Soft cheeses
- Cottage cheese
- Yogurt
3. Monosaccharides
These foods contain excess fructose.
Common foods include:
- Apples
- Pears
- Mangoes
- Watermelon
- Honey
- High-fructose corn syrup
4. Polyols
These are sugar alcohols that can be difficult to absorb.
Common foods include:
- Avocados
- Cauliflower
- Mushrooms
- Cherries
- Peaches
- Plums
- Nectarines
- Sugar-free gum
- Sugar-free candies
5. Combination Foods
Some foods contain multiple FODMAP groups.
Examples include:
- Asparagus
- Artichokes
- Certain processed foods
- Some packaged snacks
Foods That Are Generally Lower in FODMAPs
Many people find these foods easier to tolerate:
Vegetables
- Spinach
- Kale
- Lettuce
- Cucumbers
- Carrots
- Zucchini
- Bell peppers
- Green beans
Fruits
- Blueberries
- Strawberries
- Pineapple
- Grapes
- Oranges
- Kiwi
Whole Grains
- Quinoa
- Brown rice
- Oats
- Millet
Protein Sources
- Tofu
- Tempeh
- Edamame
- Nuts and seeds
- Beans that have been properly prepared and tolerated
Healthy Fats
- Olive oil
- Walnuts
- Chia seeds
- Hemp seeds
- Flax seeds
Is a Low-FODMAP Diet Right for Everyone?
No.
A low-FODMAP diet was originally developed as a therapeutic strategy for individuals with digestive disorders, particularly IBS.
Because many high-FODMAP foods contain valuable nutrients, fiber, and prebiotics that nourish beneficial gut bacteria, eliminating them unnecessarily may not be beneficial long term.
For most people, the goal should not be to avoid FODMAP foods forever.
Instead, the goal is to identify triggers, reduce symptoms, support gut healing, and gradually reintroduce foods as tolerated.
My Perspective
One of the most important lessons I've learned in nutrition is that healthy foods are not always healthy for everyone at every stage of healing.
I recently experienced this myself.
For years, I had heard about the many health benefits of avocados. They're rich in healthy fats, fiber, vitamins, and minerals, and are often considered a staple of a healthy diet. Lately, when I eat them, I noticed that within a short period of time, I would develop significant bloating, abdominal distension, and nausea.
I couldn't understand why a food that was considered so healthy seemed to make me feel worse instead of better.
After learning more about FODMAPs, it started to make sense. Avocados contain polyols, a type of FODMAP carbohydrate that can be difficult for some people to absorb. While many people tolerate avocados without issue, others may experience digestive symptoms similar to what I was experiencing.
My reaction doesn't mean avocados are unhealthy. It simply means that my digestive system may not be processing that particular food efficiently right now.
This experience reinforced something I often teach my clients: nutrition is not one-size-fits-all.
Rather than labeling foods as "good" or "bad," I encourage people to become curious about how their bodies respond. Symptoms are often valuable clues. They can help us identify underlying imbalances, whether that's gut dysbiosis, SIBO, chronic stress, impaired digestion, or another issue that deserves attention.
A low-FODMAP approach can provide relief while helping us gather information about what may be happening beneath the surface.
At the same time, I believe our goal should always be to build a healthier, more resilient digestive system whenever possible—not simply continue restricting more and more foods.
The body is incredibly intelligent. When we address the root causes of dysfunction, many people discover they can once again enjoy foods that once caused discomfort.
And that's what true healing is all about.
To Health & Longevity, 🌿
𝑀𝒶𝓇𝒾𝒶 𝐻𝓊𝒷𝓈𝒸𝒽𝑒𝓇
Innovative Wellness
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References:
- American College of Gastroenterology (ACG) Clinical Guidelines for Irritable Bowel Syndrome.
- International Foundation for Gastrointestinal Disorders (IFFGD) – Low-FODMAP Diet Resources.
- Academy of Nutrition and Dietetics. "The Low-FODMAP Diet and Digestive Health."