Food Sensitivities
Adverse reactions to foods that are not allergies or intolerances.
Overview
Food sensitivities (also called food intolerances or adverse food reactions) are non-allergic, non-celiac reactions to certain foods that cause symptoms hours to days after eating. Unlike IgE-mediated food allergies (immediate, potentially severe), sensitivities involve different immune pathways or non-immune mechanisms. They cause digestive issues, fatigue, headaches, brain fog, joint pain, and skin problems. Identification usually requires elimination diets as tests are unreliable.
Common Age
Any age; often develops in adulthood
Prevalence
Up to 20% report food intolerances; true prevalence hard to determine
Duration
Variable; many improve with gut healing; some are lifelong
Common Symptoms
- Bloating and gas
- Diarrhea or constipation
- Abdominal pain
- Fatigue
- Brain fog
- Headaches and migraines
- Joint pain
- Skin problems (eczema, acne)
- Nasal congestion
- Mood changes
- Symptoms delayed hours to days
- Dose-dependent (small amounts may be tolerated)
Possible Causes
- IgG-mediated reactions (controversial)
- Enzyme deficiencies (lactase, etc.)
- Chemical sensitivities (sulfites, MSG, etc.)
- FODMAP intolerance
- Histamine intolerance
- Salicylate sensitivity
- Gut permeability ("leaky gut")
- Gut microbiome imbalances
- Stress and gut-brain axis
Note: These are potential causes. A healthcare provider can help determine the specific cause in your case.
Quick Self-Care Tips
- 1Keep detailed food and symptom diary
- 2Try elimination diet under guidance
- 3Don't rely on IgG food sensitivity tests
- 4Eliminate common triggers first
- 5Reintroduce foods systematically
- 6Address underlying gut health
- 7Consider FODMAP elimination
- 8Work with dietitian experienced in food sensitivities
Disclaimer: These are general wellness suggestions, not medical treatment recommendations. They may help manage symptoms but should not replace professional medical care.
Detailed Treatment & Solutions
1ELIMINATION DIET
Remove suspected foods for 2-4 weeks (or comprehensive elimination for 3-4 weeks). Track symptoms. Common triggers: dairy, gluten, eggs, soy, corn, nuts, nightshades.
2SYSTEMATIC REINTRODUCTION
After elimination phase, reintroduce one food at a time, every 3-4 days. Watch for symptoms. Note that reactions may be delayed up to 72 hours.
3FOOD DIARY
Track everything eaten, portions, and all symptoms with timing. Apps can help. Look for patterns. Remember symptoms may be delayed.
4ADDRESS GUT HEALTH
Many sensitivities improve when gut heals. Consider SIBO treatment, gut repair protocols, probiotic support. The goal is tolerance, not permanent restriction.
5SPECIFIC DIETS
Low FODMAP for IBS-type symptoms. Low histamine if histamine intolerance suspected. Autoimmune protocol (AIP) for autoimmune conditions.
6BE SKEPTICAL OF TESTS
IgG food sensitivity tests are not validated and may be misleading. Elimination and reintroduction remains the gold standard for identifying sensitivities.
Important: Always consult a healthcare professional before starting any treatment regimen. The solutions above are for educational purposes and may not be suitable for everyone.
Risk Factors
- Gut dysbiosis
- Stress
- Prior infections
- Antibiotic use
- Genetic factors
Prevention
- Gut health maintenance
- Varied diet
- Stress management
When to See a Doctor
Consult a healthcare provider if you experience any of the following:
- Severe reactions (could be allergy—needs different approach)
- Difficulty managing diet on your own
- Symptoms don't improve with elimination
- Weight loss or nutritional concerns
- To rule out celiac disease, IBD, or other conditions
Talk to a Healthcare Provider
If your symptoms are persistent, severe, or concerning, please consult with a qualified healthcare professional for proper evaluation and personalized advice.
Frequently Asked Questions
QAre food sensitivity tests accurate?
IgG food sensitivity tests (blood tests measuring IgG antibodies to foods) are not scientifically validated and not recommended by allergy/immunology organizations. IgG antibodies to foods are normal and indicate exposure, not sensitivity. The gold standard remains elimination diet with systematic reintroduction.
QWill I have food sensitivities forever?
Not necessarily. Many food sensitivities improve when gut health improves. After healing, many people can reintroduce previously problematic foods, at least in moderate amounts. Some sensitivities (like lactose intolerance) may be permanent. The goal of elimination is healing and eventual reintroduction, not lifelong restriction.
Related Conditions
Irritable Bowel Syndrome (IBS)
A common disorder affecting the large intestine, causing cramping, abdominal pain, bloating, gas, and diarrhea or constipation.
Food Allergies
Immune system reaction to certain foods, ranging from mild symptoms to life-threatening anaphylaxis.
Celiac Disease
An autoimmune disorder where gluten triggers damage to the small intestine.
SIBO (Small Intestinal Bacterial Overgrowth)
Excess bacteria in the small intestine causing bloating, pain, and malabsorption.
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Medical Disclaimer
The information on this page is for educational purposes only and is not intended as medical advice. It should not be used for self-diagnosis or self-treatment. Always seek the guidance of a qualified healthcare professional with any questions you have regarding a medical condition. If you are experiencing a medical emergency, call your local emergency services immediately.
Information last reviewed: January 2026
This page provides educational information only. It is not medical advice.