Most at-home food sensitivity tests cannot tell you exactly which foods cause bloating. IgG panels are especially shaky: allergy organizations recommend against using them to diagnose food sensitivities. For meal-related bloating, a food and symptom pattern is usually more useful than a giant avoid list.
The appeal of a food sensitivity test is obvious. You feel bloated, weird, tired, puffy, or uncomfortable after meals, and you want someone to hand you the answer. A box arrives, you send in a sample, and the report tells you what to avoid. Emotionally, that sounds amazing. Scientifically, it is not that tidy.
The American Academy of Allergy, Asthma & Immunology says IgG food panel testing has not been proven to diagnose food allergies or food intolerances. They also note that IgG can reflect normal exposure to foods, not proof that a food is hurting you. That is a big deal when a test result might tell someone to cut out 20, 40, or 80 foods.
Food allergy, intolerance, and sensitivity are not the same thing
These words get mashed together online, but they mean different things.
- Food allergy: an immune reaction that can be dangerous and needs proper medical evaluation.
- Food intolerance: difficulty digesting or processing a food, like lactose intolerance.
- Food sensitivity: a looser term people use for symptoms they connect to food, but it is not one single diagnosis.
AAAAI makes the same distinction in its patient education: allergy is different from intolerance or sensitivity, and intolerance is often about digestion rather than a dangerous immune response. If you have hives, swelling, wheezing, throat tightness, vomiting, or a history of serious reactions, that is not a scanner problem or a blog-post problem. That is medical care.
Why IgG tests can send you in the wrong direction
An IgG panel often reports antibodies to foods you eat. But eating a food regularly can itself be why IgG shows up. That means a report can make everyday foods look suspicious simply because they are familiar to your immune system.
The risk is not just wasted money. The risk is restriction without clarity. If a test tells you to avoid eggs, oats, almonds, chicken, blueberries, tomatoes, yogurt, wheat, and coffee all at once, you may end up eating less variety while still not knowing whether the actual issue was lactose, garlic, onion, sugar alcohols, meal size, stress, constipation, a medical condition, or just one very aggressive protein bar.
What FODMAP tracking does differently
FODMAP tracking starts with the meal and the timing. What did you eat? Which FODMAP groups were likely there? How much? What else was happening: coffee, alcohol, carbonation, stress, your cycle, travel, constipation, sleep, or a giant late dinner?
That is more boring than a lab report. It is also more connected to real life. FODMAPs are specific fermentable carbohydrates. Monash explains that they can draw water into the gut and ferment into gas. The question is not "what foods are you sensitive to?" in the abstract. The better question is "which food components tend to show up before your symptoms?"
| If symptoms follow... | Look at... |
|---|---|
| 🍕 Pizza, pasta, garlic bread, onion-heavy sauces | 🧄 Wheat fructans, garlic, onion, lactose |
| 🫘 Beans, hummus, falafel, lentil soup | GOS and portion size |
| 🥛 Milk, ice cream, creamy sauces | Lactose |
| 🍎 Apples, pears, mango, dried fruit, honey | Excess fructose and/or sorbitol |
| 🍬 Sugar-free gum, diet bars, low-sugar candy | Polyols like sorbitol, mannitol, xylitol, maltitol |
A better first step than a 90-food avoid list
- Track timing. Note whether symptoms show up 30 minutes later, a few hours later, the next morning, or all day regardless of meals.
- Track FODMAP groups, not just foods. Garlic, onion, wheat, beans, dairy, fruit, and sugar alcohols are more informative categories than "healthy" or "bad."
- Keep portions realistic. A little avocado and half an avocado are different experiments.
- Change one thing at a time. Do not remove dairy, gluten, onions, coffee, alcohol, beans, fruit, and joy in the same week, then try to interpret the result.
- Get help when symptoms are persistent or severe. New, painful, escalating, or unexplained symptoms deserve a clinician, not a spreadsheet.
Use the free Après FODMAP Scanner to identify likely FODMAP groups in foods. It is an educational food tool, not an allergy-safety check or medical diagnosis.
Get the free app →Where Après fits after you know the pattern
Once you know the meal pattern, you can choose the tool. If your issue is mostly sugar alcohols, the move is label reading and portions. If your issue is apples, pears, honey, or mango, that is a fructose question. If your real-life meals include dairy, beans, garlic, onion, wheat, and fiber, then digestive enzymes may be useful support.
Après is designed for the covered-trigger side of that map: lactose, GOS, fructans, and certain fibers. For the enzyme-by-FODMAP breakdown, read digestive enzymes for FODMAPs.
FAQ
Do food sensitivity tests work?
Some medical tests are useful for specific questions, like allergies or lactose intolerance. But commercial IgG food panels are not recommended by AAAAI for diagnosing food sensitivities or intolerances.
Can a food sensitivity test tell me why I bloat?
Usually not in the clean way people want. Bloating can come from FODMAPs, lactose, meal size, constipation, carbonation, alcohol, stress, medical conditions, and other factors.
Is FODMAP tracking the same as an elimination diet?
No. Tracking is pattern-finding. A full low-FODMAP elimination and reintroduction plan is more structured and is best done with a qualified clinician or dietitian.
Can the Après app diagnose food sensitivities?
No. It helps identify likely FODMAP groups in foods and ingredients. It does not diagnose allergies, intolerances, IBS, SIBO, celiac disease, or any medical condition.
What should I do if my symptoms are getting worse?
Talk with a healthcare provider, especially if symptoms are new, severe, persistent, painful, or come with weight loss, blood, fever, vomiting, anemia, or major bowel changes.
Sources
- AAAAI: the myth of IgG food panel testing
- AAAAI: food intolerance
- Monash FODMAP: FODMAPs and IBS
- NIDDK: symptoms and causes of gas in the digestive tract
This article is general information, not medical advice. It does not diagnose food allergies, intolerances, or digestive conditions. If symptoms are persistent, severe, new, painful, or unexplained, work with a healthcare provider.