What does the research show about elimination diet?

Elimination diet

In eosinophilic esophagitis, elimination diets brought histologic remission in about 40% to 72% of patients, and removing milk alone matched removing four or six foods in trials. In eczema, gains were slight or absent. ADHD effects faded under blinded ratings. Children avoiding several foods had nutrient shortfalls and lower growth scores, and eczema elimination may raise food allergy risk.

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Status: A dietary pattern, not a regulated product.
Also called: exclusion diet, food elimination diet, six-food elimination diet, 6FED, four-food elimination diet, milk elimination diet, few-foods diet, oligoantigenic diet, restricted elimination diet, IgG food elimination diet
Followed for: eczema, eosinophilic esophagitis, ADHD, migraine, food sensitivities

Strong several reviews agree · Moderate one review or consistent trials · Limited one or a few small studies · Untested no study in people, listed with what it rests on

Shown to help3

ModerateShown to bring histologic remission in about 40% to 72% of people with eosinophilic esophagitis, rising as more foods are removed.
ModerateShown to give similar remission with milk removed alone as with four or six foods removed, in one trial in adults and one in children.
LimitedOne small crossover trial found fewer headache days and migraine attacks during 6 weeks on an IgG-guided elimination diet than at baseline.

Reported risks10

LimitedLinked to lower calcium intake in people with eczema avoiding milk, wheat or soy, and in children avoiding several food allergens.
LimitedLinked to lower zinc intake in people with eczema avoiding milk, wheat or soy, and in children avoiding several food allergens.
LimitedLinked to lower iron intake in people with eczema avoiding wheat, soy or meats, and in children avoiding several food allergens.
LimitedLinked to reduced vitamin D intake in children avoiding several food allergens.
LimitedLinked to reduced vitamin B12 intake in children avoiding several food allergens.
LimitedLinked to reduced iodine intake in children avoiding several food allergens.
LimitedLinked to reduced folate intake in children avoiding several food allergens.
LimitedLinked to lower height, weight and head circumference scores in children with multiple food allergies than in children without allergies.
LimitedA review states indirect evidence suggests elimination diets for eczema may raise the risk of developing IgE-mediated food allergy.
LimitedOne trial in children found 32% left a four-food elimination diet, against 11% removing milk alone.

What people follow it for, and what was found

Shown to help3

Moderate

Eosinophilic esophagitis remission

Shown to bring histologic remission in about 40% to 72% of people with eosinophilic esophagitis, rising as more foods are removed.

Compared with no comparison group; remission rates are pooled for each kind of elimination diet and set side by side [1], [2]

The numbers and sources

Effect: Across 33 studies (1,317 patients), remission was 90.8% on elemental formula, 72.1% on a six-food elimination diet and 45.5% on diets guided by allergy tests. Adults and children did not differ (67.2% against 63.3%) [1]. An update of 43 studies (2,825 patients) found overall remission of 60.6%: 94.5% on elemental formula, 63.9% removing six foods, 54.7% removing four, 44.3% removing two, 46.4% removing one and 39.5% on allergy-test-guided diets [2].
Population: Children and adults with eosinophilic esophagitis [1][2].
Sources: [1], [2]
Caveats: The two reviews share most authors. Many included studies were not randomized, and remission was higher in retrospective than prospective studies [2]. Elemental diets replace food with amino acid formula [1].

Moderate

Milk alone against several foods in eosinophilic esophagitis

Shown to give similar remission with milk removed alone as with four or six foods removed, in one trial in adults and one in children.

Compared with a six-food elimination diet [3]; a four-food elimination diet [4]

The numbers and sources

Effect: In adults after 6 weeks, 40% removing six foods and 34% removing milk alone reached histologic remission (difference 6%, 95% CI -11 to 23). Complete remission was 13% more common with six foods removed. Of milk-only nonresponders, 43% then remitted removing six foods [3]. In children after 12 weeks, remission was 41% removing four foods and 44% removing milk alone. Symptom scores improved more with four foods removed (-25.0 against -14.5) [4].
Population: 129 adults aged 18 to 60 at 10 US sites [3]; 63 children aged 6 to 17 [4].
Sources: [3], [4]
Caveats: The adult trial was open-label [3]. No adverse event occurred in more than 5% of either adult group [3].

Limited

Migraine

One small crossover trial found fewer headache days and migraine attacks during 6 weeks on an IgG-guided elimination diet than at baseline.

Compared with before the diet, in the same people [11]

The numbers and sources

Effect: Against baseline, headache days fell from 10.5 to 7.5 and migraine attacks from 9.0 to 6.2 during the elimination period (P < 0.001) [11].
Population: 30 adults with migraine without aura, 28 women [11].
Sources: [11]
Caveats: The abstract reports the elimination period against baseline, not against the provocation diet. In the ADHD trial, IgG levels did not predict which foods caused relapse [9].

Mixed results2

Moderate

Eczema

Mixed results: food elimination slightly improved eczema severity in one review, at low certainty, and a Cochrane review found no benefit in unselected patients.

Compared with no dietary elimination [5]; a normal diet [6]

The numbers and sources

Effect: Across 10 RCTs (599 participants), 50% with dietary elimination and 41% without improved eczema scores by the minimal important difference (risk difference 9%, 95% CI 0 to 17). Sleeplessness improved (MD -0.47 on a 0 to 3 scale), and itch did not change significantly [5]. A Cochrane review of 9 RCTs (421 participants) found no benefit from egg and milk exclusion, few-foods diets or elemental diets in unselected patients. In infants with suspected egg allergy and egg-specific IgE, 51% improved on an egg-free diet (RR 1.51, 95% CI 1.07 to 2.11) [6].
Population: Mostly young children with mild to moderate eczema, median age 1.5 years [5]; people with doctor-diagnosed atopic eczema [6].
Sources: [5], [6]
Caveats: Certainty was low [5]. Trials had poor allocation concealment, little blinding and high dropout [6].

ModerateStudied in children

ADHD symptoms

Mixed results: restriction diets lowered ADHD ratings when raters knew the diet, effects faded with blinded ratings, and one trial found fewer responders than an active control diet.

Compared with a placebo-controlled food challenge or a crossover comparison [7]; control conditions the source does not describe [8]; instructions for a healthy diet [9]; a healthy diet, as an active control [10]

The numbers and sources

Effect: Restriction diets reduced ADHD symptoms with an effect size of 0.29 (95% CI 0.07 to 0.53) [7]. With ratings from those closest to treatment, dietary treatments showed effects of 0.21 to 0.48, and with probably blinded ratings, restricted elimination diets fell to nonsignificant levels [8]. In a trial of 100 children aged 4 to 8, ADHD rating scores were 23.7 points lower after 5 weeks on the diet than on control, by a masked pediatrician, and 63% of responders relapsed on food challenge [9]. In 165 children aged 5 to 12, 35% on an elimination diet and 51% on an active control diet (the trial's Healthy Diet arm) had a partial to full response [10].
Population: Children with ADHD [7][8][9][10].
Sources: [7], [8], [9], [10]
Caveats: In [9], only the assessing pediatrician was masked in the first phase. Treatment allocation in [10] was unblinded.

How trials defined it

The six-food elimination diet removed animal milk, wheat, egg, soy, fish and shellfish, and peanut and tree nuts, for 6 weeks [3]. The four-food diet removed milk, egg, wheat and soy for 12 weeks [4]. Elemental diets fed amino acid-based formula only [1]. The ADHD trials ran a restricted elimination diet for 5 weeks, followed in one by blinded food challenges [9][10]. The migraine trial removed foods with raised IgG out of 266 tested, an average of 24 foods, for 6 weeks [11]. Eczema trials excluded egg and milk, used few-foods diets or used elemental diets [6].

Risks

Reported risks10

Limited

Calcium

Linked to lower calcium intake in people with eczema avoiding milk, wheat or soy, and in children avoiding several food allergens.

The numbers and sources

Effect: In people with atopic dermatitis and food allergy, those allergic to milk ate less calcium, zinc and riboflavin, and those allergic to wheat and soybean ate less calcium, phosphorus, iron, potassium, zinc, vitamin B6 and niacin [12]. Children with multiple food allergies had reduced intake of protein, calcium, iron, zinc, iodine, folate, vitamin B12 and vitamin D [13].
Population: 225 people with atopic dermatitis who underwent food challenges [12]; children with multiple food allergies in 11 studies [13].
Sources: [12], [13]
Caveats: Intake, not blood status. The abstracts give no rates [12][13]. The children in [13] were avoiding foods they were allergic to.

Limited

Zinc

Linked to lower zinc intake in people with eczema avoiding milk, wheat or soy, and in children avoiding several food allergens.

The numbers and sources

Effect: Zinc intake was lower in people with atopic dermatitis allergic to milk or to wheat and soybean [12] and in children with multiple food allergies [13].
Population: 225 people with atopic dermatitis [12]; children with multiple food allergies [13].
Sources: [12], [13]
Caveats: Intake, not status. No rates given [12][13].

Limited

Iron

Linked to lower iron intake in people with eczema avoiding wheat, soy or meats, and in children avoiding several food allergens.

The numbers and sources

Effect: Iron intake was lower in people with atopic dermatitis allergic to wheat and soybean or to beef, pork and chicken [12] and in children with multiple food allergies [13].
Population: 225 people with atopic dermatitis [12]; children with multiple food allergies [13].
Sources: [12], [13]
Caveats: Intake, not status. No rates given [12][13].

LimitedStudied in children

Vitamin D

Linked to reduced vitamin D intake in children avoiding several food allergens.

The numbers and sources

Effect: Children with multiple food allergies had reduced vitamin D intake [13].
Population: Children with multiple food allergies in 11 studies [13].
Sources: [13]
Caveats: One review searched in PubMed only, with no rates in the abstract [13].

LimitedStudied in children

Vitamin B12

Linked to reduced vitamin B12 intake in children avoiding several food allergens.

The numbers and sources

Effect: Children with multiple food allergies had reduced vitamin B12 intake [13].
Population: Children with multiple food allergies in 11 studies [13].
Sources: [13]
Caveats: One review searched in PubMed only, with no rates in the abstract [13].

LimitedStudied in children

Iodine

Linked to reduced iodine intake in children avoiding several food allergens.

The numbers and sources

Effect: Children with multiple food allergies had reduced iodine intake [13].
Population: Children with multiple food allergies in 11 studies [13].
Sources: [13]
Caveats: One review searched in PubMed only, with no rates in the abstract [13].

LimitedStudied in children

Folate

Linked to reduced folate intake in children avoiding several food allergens.

The numbers and sources

Effect: Children with multiple food allergies had reduced folate intake [13].
Population: Children with multiple food allergies in 11 studies [13].
Sources: [13]
Caveats: One review searched in PubMed only, with no rates in the abstract [13].

LimitedStudied in children

Lower growth scores in children

Linked to lower height, weight and head circumference scores in children with multiple food allergies than in children without allergies.

The numbers and sources

Effect: Children with multiple food allergies had lower height-for-age, weight-for-age, head circumference and weight-for-length Z-scores than non-allergic peers [13].
Population: Children with multiple food allergies in 11 studies [13].
Sources: [13]
Caveats: An association from a review of 11 studies. The authors tie the risk to dietary management that does not make up for nutrient losses [13].

Limited

New food allergy after elimination for eczema

A review states indirect evidence suggests elimination diets for eczema may raise the risk of developing IgE-mediated food allergy.

The numbers and sources

Effect: The trials had too little data on harms, and the authors state that indirect evidence suggests elimination diets may raise the risk of developing IgE-mediated food allergy [5].
Population: People with atopic dermatitis [5].
Sources: [5]
Caveats: Indirect evidence with no rates in the abstract [5].

LimitedStudied in children

Dropout

One trial in children found 32% left a four-food elimination diet, against 11% removing milk alone.

The numbers and sources

Effect: Withdrawal was 32% on the four-food diet and 11% on milk elimination (P = 0.0496) [4].
Population: 63 children aged 6 to 17 with eosinophilic esophagitis [4].
Sources: [4]
Caveats: One small trial [4].

Supplements to consider

The nutrients research linked to this diet running short, each with its own page.

Claims tested and not found

That IgG blood tests identify the foods behind ADHD symptoms. Relapse after food challenge occurred in 63% of responders whether the foods had high or low IgG [9].
That removing egg and milk helps eczema in unselected patients. A Cochrane review found no benefit in people not selected for egg or milk allergy [6].

Sources

Arias A, González-Cervera J, Tenias JM, et al. Efficacy of dietary interventions for inducing histologic remission in patients with eosinophilic esophagitis: a systematic review and meta-analysis. Gastroenterology. 2014. https://doi.org/10.1053/j.gastro.2014.02.006
Arias Á, Tejera-Muñoz A, Gutiérrez-Ramírez L, et al. Efficacy of Dietary Therapy for Eosinophilic Esophagitis in Children and Adults: An Updated Systematic Review and Meta-Analysis. Nutrients. 2024. https://doi.org/10.3390/nu16142231
Kliewer KL, Gonsalves N, Dellon ES, et al. One-food versus six-food elimination diet therapy for the treatment of eosinophilic oesophagitis: a multicentre, randomised, open-label trial. The Lancet Gastroenterology & Hepatology. 2023. https://doi.org/10.1016/s2468-1253(23)00012-2
Kliewer KL, Abonia JP, Aceves SS, et al. One-food versus 4-food elimination diet for pediatric eosinophilic esophagitis: A multisite randomized trial. Journal of Allergy and Clinical Immunology. 2025. https://doi.org/10.1016/j.jaci.2024.08.023
Oykhman P, Dookie J, Al-Rammahy H, et al. Dietary Elimination for the Treatment of Atopic Dermatitis: A Systematic Review and Meta-Analysis. The Journal of Allergy and Clinical Immunology: In Practice. 2022. https://doi.org/10.1016/j.jaip.2022.06.044
Bath-Hextall F, Delamere FM, Williams HC. Dietary exclusions for established atopic eczema. Cochrane Database of Systematic Reviews. 2008. https://doi.org/10.1002/14651858.cd005203.pub2
Nigg JT, Lewis K, Edinger T, et al. Meta-analysis of attention-deficit/hyperactivity disorder or attention-deficit/hyperactivity disorder symptoms, restriction diet, and synthetic food color additives. Journal of the American Academy of Child & Adolescent Psychiatry. 2012. https://doi.org/10.1016/j.jaac.2011.10.015
Sonuga-Barke EJ, Brandeis D, Cortese S, et al. Nonpharmacological interventions for ADHD: systematic review and meta-analyses of randomized controlled trials of dietary and psychological treatments. American Journal of Psychiatry. 2013. https://doi.org/10.1176/appi.ajp.2012.12070991
Pelsser LM, Frankena K, Toorman J, et al. Effects of a restricted elimination diet on the behaviour of children with attention-deficit hyperactivity disorder (INCA study): a randomised controlled trial. The Lancet. 2011. https://doi.org/10.1016/s0140-6736(10)62227-1
Huberts-Bosch A, Bierens M, Ly V, et al. Short-term effects of an elimination diet and healthy diet in children with attention-deficit/hyperactivity disorder: a randomized-controlled trial. European Child & Adolescent Psychiatry. 2023. https://doi.org/10.1007/s00787-023-02256-y
Alpay K, Ertas M, Orhan EK, et al. Diet restriction in migraine, based on IgG against foods: a clinical double-blind, randomised, cross-over trial. Cephalalgia. 2010. https://doi.org/10.1177/0333102410361404
Kim J, Kwon J, Noh G, et al. The effects of elimination diet on nutritional status in subjects with atopic dermatitis. Nutrition Research and Practice. 2013. https://doi.org/10.4162/nrp.2013.7.6.488
Di Cesare G, Carciofi A, Borgiani F, et al. Are We Meeting the Needs? A Systematic Review of Nutritional Gaps and Growth Outcomes in Children with Multiple Food Allergies. Nutrients. 2025. https://doi.org/10.3390/nu17091590

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