Key takeaways
- In a National Jewish Health study of 125 children with eczema on elimination diets based on allergy blood tests, 93% of supervised food challenges showed the child could eat the food1.
- At Lurie Children’s Hospital of Chicago, 19% of children with food-triggered eczema who had never had an immediate reaction developed one after starting an elimination diet2.
- For celiac disease, the American College of Gastroenterology says testing works only while you still eat gluten, and treatment means strict gluten avoidance for life4.
- In a 2023 NIH-funded trial of 129 adults with eosinophilic esophagitis, cutting milk alone worked about as well as cutting six foods5.
- British gut specialists advise against diets based on IgG blood tests and suggest screening for eating-disorder risk before recommending a restrictive diet for IBS9.
In 2011, a team at National Jewish Health reported on 125 children with eczema who had been put on elimination diets based on allergy blood tests1. The children, ages 1 to 19, then ate the avoided foods in a series of small doses under medical watch, a test called an oral food challenge1.
Ninety-three percent of those challenges came back negative, meaning the child could eat the food1. Foods that had ever caused anaphylaxis weren’t tested1.
That fits a warning in the food allergy guidelines sponsored by the National Institute of Allergy and Infectious Diseases (NIAID) in 2010. The guidelines cite studies finding that half to nine in ten suspected food allergies turn out not to be allergies at all3.
Needless avoidance isn’t harmless, either. In 2016, researchers at Lurie Children’s Hospital of Chicago studied 298 children whose eczema was tied to food2. Among those who had never had a fast, immediate reaction to a food, 19% developed one after starting an elimination diet. Nearly a third of those new reactions included anaphylaxis, a severe whole-body reaction2.
Yet for other people, cutting out a food is the treatment, and skipping it would be the mistake. This guide sorts the two.
The short answer: cut a food when a diagnosis calls for it
Cutting a food is medically appropriate when three things line up. A clinician has confirmed the condition with a proper test. Avoiding the food is the proven treatment. And someone is watching your nutrition and planning when, or whether, to test the food again.
Natural-health readers have good reasons to take food reactions seriously. Medicine itself uses elimination diets for eosinophilic esophagitis and IBS, and researchers have tested them for ADHD5911. Many people have also had a doctor brush off a food reaction that turned out to be real.
The cautionary side is just as real. Self-reports and test results often mislead13. Cutting foods can shrink a child’s diet, feed an eating disorder and, as the Lurie study suggests, sometimes come before a new allergy214.
The aim fits natural-health values: listen to your body, then check what it’s telling you before you give up a food for good.
Proven food allergy: avoidance works, but the label needs proof
For a confirmed food allergy, avoiding the food is the treatment, according to the NIAID guidelines3.
Proof is the catch. The guidelines say neither a skin prick test nor a blood test for IgE, the antibody behind classic allergic reactions, can diagnose a food allergy by itself3. A supervised oral food challenge may be needed to settle the question3.
The guidelines rule out intradermal skin testing and total IgE levels, and advise against routine atopy patch tests3. Hair analysis, electrodermal testing and kinesiology aren’t recommended either, a 2011 report on the guidelines noted1.
If a food has ever caused a serious reaction, the Lurie researchers stressed, a child needs an emergency action plan and injectable epinephrine2. Don’t test that food at home. An allergist can decide whether and when a supervised challenge makes sense.
Celiac disease: test first, then go strict for life
Celiac disease is the clearest case for lifelong elimination. The American College of Gastroenterology’s 2023 guideline notes there’s no effective medical treatment, so people with the disease must keep gluten out of their diet strictly and for good4.
Order matters. The first test, a blood test called tTG-IgA, is reliable only in people who are still eating gluten4. Once you’ve gone gluten-free, blood tests and biopsies lose their accuracy4.
If you’ve already cut gluten, ask about a gene test for HLA-DQ2 or DQ8. A negative result rules celiac disease out and spares you a “gluten challenge,” eating gluten again on purpose before testing4.
After diagnosis, the guideline points patients to a dietitian. It recommends oats labeled gluten-free, because regular oats are often contaminated, and advises against handheld gluten-detection gadgets because of false results4.
Most people feel better fast: more than 80% see their diarrhea improve within 60 days4. Healing inside takes longer. The median time for the gut lining to heal is about three years, so the guideline suggests a follow-up biopsy be considered at two years4.
Eosinophilic esophagitis: one food may be enough
In EoE, an allergic reaction to certain foods inflames the esophagus, the tube that carries food to the stomach. Eating can hurt, and food can catch on the way down5. NIH puts the number of Americans with EoE at about 160,0005.
Diet is one of the first treatments doctors offer. Studies in the early 2000s pointed to six usual culprits: milk, egg, wheat and soy, plus fish and nuts. Removing all six at once, the six-food elimination diet, came into wide use5.
Was cutting six foods overkill? In 2023, an NIH-funded trial at 10 U.S. medical centers put that to the test5.
Researchers randomly assigned 129 adults to give up animal milk alone, or all six foods, for six weeks. Each then had an endoscopy and a biopsy5.
The two diets performed about the same. Forty percent of the milk-only group reached remission, compared with 34% of the six-food group, and the difference wasn’t statistically significant5. People in both groups reported similar gains in symptoms and quality of life5.
There was a backup plan, too. When milk alone failed, moving to the six-food diet worked for nearly half. When six foods failed, steroids brought remission to more than 80%5. And one food is far easier to give up than six, as NIAID’s then-acting director pointed out5.
How does diet compare with medicine? A summary of the 2020 guideline from the American Gastroenterological Association and a joint allergy task force gives rough success rates6:
| Treatment | Clears inflammation in about |
|---|---|
| Amino-acid formula only (elemental diet) | Over 90% of children, fewer adults; hard to stay on |
| Swallowed steroids | Two-thirds of patients |
| Six-food elimination | Two-thirds of patients |
| Diet based on allergy tests | Half of patients |
| Acid-blocking PPIs | One-third of patients |
In EoE, how you feel isn’t a reliable scorecard, because symptom relief may not match what a biopsy shows6.
The American College of Gastroenterology’s January 2025 EoE guideline suggests an empiric elimination diet, with foods chosen by their track record as triggers rather than by test results. It advises against building the diet on today’s allergy tests15.
Both diet recommendations are conditional, with evidence graded low or very low quality, while swallowed steroids get a strong recommendation on moderate-quality evidence15. One likely reason, noted in the 2020 guideline summary: most diet studies were short and lacked a comparison group6. That’s why our evidence table calls EoE diet therapy promising but early, even though doctors offer it as a first-line option.
Lactose and IBS: cut back first, cut out only briefly
About 36% of people in the U.S. have lactose malabsorption, NIDDK estimates, and about 68% worldwide7. Most of them don’t need to quit dairy.
Research suggests many people can handle 12 grams of lactose, about the amount in a cup of milk, with mild symptoms or none8. NIDDK suggests small amounts of milk with meals, yogurt and hard cheeses such as cheddar or Swiss, lactase products, and lactose-free milk8.
Cutting out all dairy has a price: you may come up short on calcium and vitamin D, NIDDK warns8.
For IBS, the best-studied elimination diet is low-FODMAP, which cuts certain fermentable carbohydrates for a short time. The British Society of Gastroenterology calls it a second-line option that a trained dietitian should supervise9. The cutting phase lasts 4 to 6 weeks, and foods then come back according to tolerance9.
The same guideline adds a step many diet plans skip: before suggesting a restrictive diet, screen gently for eating-disorder risk with a short questionnaire9.
It also strongly recommends against elimination diets based on IgG antibody blood tests, often sold as food sensitivity tests, because those tests lack specificity9. Later articles in this series cover low-FODMAP and food sensitivity tests in detail.
Eczema and ADHD: where elimination diets are contested
In December 2023, a joint task force of the American Academy of Allergy, Asthma & Immunology (AAAAI) and the American College of Allergy, Asthma and Immunology suggested against elimination diets for atopic dermatitis, the medical name for eczema10.
The 2010 NIAID guidelines were already narrow. They advised against cutting foods to manage eczema, asthma or EoE unless a food allergy was documented1. For eczema, they suggested checking for milk, egg, peanut, wheat or soy allergy only in children under 5 whose moderate to severe eczema persists despite good skin care, or who had a clear immediate reaction to a food1. San Diego pediatric dermatologist Lawrence Eichenfield urged keeping skin care at the center rather than hunting for hidden food triggers1.
ADHD is the most debated case. In the INCA trial, published in The Lancet in 2011, Dutch researchers led by Lidy Pelsser randomly assigned 100 children ages 4 to 8 with ADHD to five weeks on a “few foods” diet or to a control group1112. The diet was built on rice, meat, vegetables, pears and water, and could be widened with potatoes, fruits and wheat12.
Of 50 children on the diet, 32 (64%) met the study’s bar for clear improvement11. When 30 of those responders were later given foods in a blinded challenge, 19 relapsed11. IgG blood levels didn’t predict which foods caused trouble, and the researchers advised against IgG tests11.
Critics noted that parents and teachers knew which children were on the diet during the first phase, though pediatricians’ ratings were blinded12. One child psychiatrist suggested ending a strict diet after five weeks if it isn’t helping12. Our rating is promising but early, and a few-foods diet belongs under a clinician’s and dietitian’s care.
Migraine food triggers are covered in our article on testing your own patterns.
What cutting foods can cost
Elimination diets are hardest on growing children. In findings presented at the AAAAI’s 2013 meeting, researchers compared 245 children with food allergies with 4,584 healthy children13.
After age 2, children with food allergies had lower weight and body mass index percentiles. Those with more than two allergies were shorter and lighter than those with one or two13. The researchers said avoiding more than two foods plus milk puts children, especially those under 2, at risk of growth delay13.
Restriction can also spread beyond the menu. ARFID, short for avoidant/restrictive food intake disorder, is an eating disorder centered on restricting food. In a 2020 study publicized by the AAAAI, research psychologists checked for it among 54 children seen at an allergy clinic14.
One child in five met the criteria. Adding the cases judged possible or probable, up to 41% may have been affected14. Over half the families, 56%, said food was being restricted past what the known or suspected allergies called for14.
Growth was usually still on track. Even so, study author Brian Vickery warned that ARFID can be long-lasting and seriously disrupt daily life14.
If cutting foods has started to feel driven by fear, or your list of safe foods keeps shrinking, reach out. The National Alliance for Eating Disorders helpline is 1-866-662-1235. If you’re in crisis, call or text 988.
Your elimination-diet decision table
This table is our own summary of the guidelines and studies above. Use it to frame a conversation with your clinician, not to diagnose yourself.
| Condition | Cut the food? | How it’s confirmed | Who should guide it | Adding foods back |
|---|---|---|---|---|
| Proven food allergy (IgE type) | Yes, the proven food3 | History plus tests; supervised challenge when unclear3 | Allergist | Only through supervised challenges; never at home after a severe reaction |
| Celiac disease | Yes, strictly and for life4 | tTG-IgA blood test while eating gluten, then biopsy4 | Gastroenterologist and dietitian4 | No; gluten stays out4 |
| Eosinophilic esophagitis | Yes, as one option beside medicine5615 | Endoscopy with biopsy5 | GI doctor, allergist and dietitian | Planned with your team; response judged by biopsy56 |
| Lactose intolerance | Usually cut back, not out8 | Symptoms after dairy, reviewed with a clinician | Clinician or dietitian8 | Find your comfortable amount8 |
| IBS | Short low-FODMAP trial, second-line9 | Clinical IBS diagnosis | Trained dietitian9 | After 4 to 6 weeks, by tolerance9 |
| Eczema | Generally no10 | Allergy check only in select young children1 | Allergist and dermatologist | Supervised challenges for foods cut on test results alone1 |
| ADHD | Not routine; a research option1112 | IgG tests didn’t predict trigger foods11 | Clinician and dietitian | Stop after about five weeks without benefit12 |
| IgG “sensitivity” results | No9 | IgG doesn’t identify triggers911 | Clinician or dietitian | Restore foods cut on IgG results alone |
How strong is the evidence?
| Approach | Rating | Why |
|---|---|---|
| Strict gluten avoidance after a confirmed celiac diagnosis | The only effective treatment, per the 2023 ACG guideline4 | |
| Avoiding a proven IgE food allergen | Standard treatment in the NIAID guidelines3 | |
| Elimination diets for eosinophilic esophagitis | Biopsy-confirmed results and a randomized trial, but most diet studies were short and uncontrolled; graded low quality5615 | |
| Most people with lactose intolerance can still have some dairy | NIDDK, summing up research: many tolerate about a cup of milk’s worth of lactose8 | |
| Short, dietitian-led low-FODMAP trial for IBS | Guideline-backed but rated very low quality9 | |
| Few-foods diet for ADHD | One striking trial, partly unblinded1112 | |
| Elimination diets for eczema without proven allergy | Experts suggest against; linked to new immediate reactions210 | |
| Cutting foods based on IgG tests | Strong recommendation against; IgG didn’t predict triggers911 |
Questions readers ask
My child’s allergy blood test was positive for several foods. Should we avoid them all?
Not without an allergist’s review. The NIAID guidelines say these tests can’t diagnose allergy alone, and in the National Jewish Health study most foods avoided on test results passed supervised challenges13. Never bring back a food on your own if it has caused a reaction.
I feel better off gluten but never got tested. What now?
Tell your clinician. Blood tests and biopsies aren’t accurate once you’re gluten-free, but a gene test can rule celiac disease out4. Don’t start eating gluten again to prepare for testing without guidance.
Can I try an elimination diet on my own?
For mild symptoms that have never been dangerous, a short, planned trial with an end date can be reasonable, ideally with a dietitian. Skip home trials for any food that has caused a fast or severe reaction, and with children, keep an eye on growth13.
The bottom line
Cutting out a food is real medicine for celiac disease, proven food allergies and eosinophilic esophagitis, and a careful cutback helps lactose intolerance and some IBS. In each of those cases, a test comes first, a professional helps and the plan has a clear way to judge success.
Without a confirmed reason, elimination diets can trade one problem for others: fewer nutrients, slower growth, an anxious relationship with food and, in some children, a new allergy. Test first, cut narrowly, set an end date and plan the way back.
Related reading
About this article
This article was researched using NIH sources, medical society guidelines and peer-reviewed studies, all listed below. It was reviewed in October 2026. It is general education and not medical, legal or financial advice.
Sources
- Skin & Allergy News. “Food Elimination Diets for Atopy Often Unnecessary, Expert Says” (report on Lawrence Eichenfield’s 2011 Hawaii Dermatology Seminar talk, a 2011 National Jewish Health study in the Journal of Pediatrics and the 2010 NIAID guidelines). The Hospitalist/MDedge, 2011. blogs.the-hospitalist.org
- Ann & Robert H. Lurie Children’s Hospital of Chicago. “Study Suggests Kids with Food-Triggered Eczema are at Risk for Developing Life-Threatening Food Allergy” (news release on a study with senior author Anne Marie Singh, Journal of Allergy and Clinical Immunology: In Practice, 2016;4:229–236). Newswise, May 23, 2016. newswise.com
- American Family Physician. “NIAID Releases Guidelines on Diagnosis and Management of Food Allergy” (summary of Boyce JA, et al., Journal of Allergy and Clinical Immunology, 2010). June 15, 2011. aafp.org
- American Family Physician. “Diagnosis and Management of Celiac Disease: Guidelines From the American College of Gastroenterology” (summary of Rubio-Tapia A, et al., American Journal of Gastroenterology, 2023). January 2024. aafp.org
- National Institutes of Health. “Forgoing one food treats eosinophilic esophagitis as well as excluding six” (news release on Kliewer KL, et al., Lancet Gastroenterology & Hepatology, 2023). February 27, 2023. nih.gov
- American Family Physician. Summary and rating of the AGA Institute and Joint Task Force on Allergy-Immunology Practice Parameters guidelines for eosinophilic esophagitis (Hirano I, et al., Gastroenterology, 2020). May 1, 2021, p. 573. aafp.org
- National Institute of Diabetes and Digestive and Kidney Diseases. “Definition & Facts for Lactose Intolerance.” NIH, last reviewed February 2018. niddk.nih.gov
- National Institute of Diabetes and Digestive and Kidney Diseases. “Eating, Diet, & Nutrition for Lactose Intolerance.” NIH, last reviewed February 2018. niddk.nih.gov
- Vasant DH, Paine PA, Black CJ, et al. “British Society of Gastroenterology Guidelines on the Management of Irritable Bowel Syndrome.” Gut, 2021. gut.bmj.com
- American College of Allergy, Asthma and Immunology. “New guidelines released for practitioners treating anaphylaxis and atopic dermatitis” (on the 2023 AAAAI/ACAAI Joint Task Force atopic dermatitis guideline, Annals of Allergy, Asthma & Immunology). December 19, 2023. acaai.org
- Contemporary Pediatrics. “Restricted diet may help reduce ADHD symptoms” (on Pelsser LM, Frankena K, Toorman J, et al., The Lancet, 2011;377(9764):494–503). February 11, 2011. contemporarypediatrics.com
- Food and Behaviour Research. Summary of the INCA trial (Pelsser LM, et al., The Lancet, 2011) and expert reactions. Accessed October 2026. library.fabresearch.org
- Contemporary Pediatrics. “Food elimination diets restrict kids’ growth” (on findings presented at the 2013 AAAAI Annual Meeting). March 4, 2013. contemporarypediatrics.com
- American Academy of Allergy, Asthma & Immunology. News release on avoidant/restrictive food intake disorder (ARFID) in children with food allergy (study published in a Journal of Allergy and Clinical Immunology supplement). March 19, 2020. aaaai.org
- American College of Physicians, ACP Gastroenterology. “ACG releases updated EoE guideline” (on Dellon ES, et al., “ACG Clinical Guideline: Diagnosis and Management of Eosinophilic Esophagitis,” American Journal of Gastroenterology, January 2025). January 24, 2025. gastroenterology.acponline.org