Overview
A low-nickel diet (LNiD) restricts dietary nickel intake to approximately 100-150 ug/day (vs the 200-600 ug typical in Western diets) by eliminating or limiting high-nickel foods such as legumes, whole grains, nuts, chocolate, and canned goods. It is the primary intervention for Systemic Nickel Allergy Syndrome (SNAS) and Nickel Allergic Contact Mucositis (Ni ACM), and has demonstrated clinical efficacy across at least 11 distinct conditions.
Who it is for. Nickel sensitivity affects an estimated 8-19% of adults (14-20% of women, 2-4% of men) by epicutaneous patch test ahlstrom 2019 nickel allergy review. Ni ACM -- the gastrointestinal manifestation -- may exceed 30% prevalence in the general population borghini 2020 low nickel diet celiac. SNAS affects approximately 20% of nickel ACD patients braga 2013 snas nosologic framework. The strong female predominance reflects both greater sensitization exposure (jewelry, ear piercing) and hormonal modulation -- nickel sensitivity fluctuates with the menstrual cycle, with reactions more severe during the progestinic phase bonamonte 2005 nickel allergy menstrual cycle.
Historical context. The first clinical trial of dietary nickel restriction was published by Kaaber, Veien, and Tjell in 1978 kaaber 1978 low nickel diet chronic dermatitis, demonstrating that oral nickel provoked hand eczema in 17/28 patients and that a 6-week LNiD improved 9/17 of those who reacted. Nearly five decades of evidence have since accumulated across dermatology, gastroenterology, gynecology, and metabolic medicine.
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Mechanism of Action -- The Metallomics Framework
The low-nickel diet operates through two distinct but complementary mechanisms: an immunological pathway (reducing the antigenic trigger in sensitized individuals) and an antimicrobial pathway (starving nickel-dependent virulence enzymes in pathogens). Both pathways converge on clinical benefit.
1. Antimicrobial Mechanism: Dietary Nutritional Immunity
Restricting dietary nickel is a clinical application of nutritional immunity -- the principle that withholding essential metals from pathogens is an antimicrobial strategy. Mammals do not synthesize known nickel-requiring proteins, making nickel restriction a uniquely low-cost intervention: it imposes no metabolic penalty on the host while disabling critical pathogen enzymes maier 2019 nickel microbial pathogenesis.
Key nickel-dependent virulence enzymes disabled by dietary restriction:
| Enzyme | Function | Pathogens Affected | Clinical Impact |
|--------|----------|-------------------|----------------|
| urease | Hydrolyzes urea to ammonia + CO2; buffers acid environments; disrupts tight junctions; activates platelets | H. pylori, S. aureus, P. mirabilis, Ureaplasma, C. neoformans | Acid survival destroyed; biofilm formation impaired; pH regulation restored |
| NiFe hydrogenase | Oxidizes H2 for energy; powers CagA translocation in H. pylori | H. pylori, H. hepaticus, Salmonella, Campylobacter, Shigella | Energy metabolism impaired; virulence factor translocation blocked |
| nickel glyoxalase (GloI) | Detoxifies methylglyoxal; enables immune evasion | P. aeruginosa, N. meningitidis, Y. pestis, Clostridia, L. donovani | Pathogens become susceptible to neutrophil killing |
| Acireductone dioxygenase (ARD) | Methionine salvage pathway | All pathogenic gamma-proteobacteriaceae | Methionine metabolism disrupted |
| Ni-SOD | Superoxide detoxification | Streptomyces spp. | Oxidative stress defense impaired |
This affects 40+ prokaryotic and 9+ eukaryotic pathogen species that depend on nickel for virulence maier 2019 nickel microbial pathogenesis. The paradigmatic example is helicobacter pylori, where urease comprises up to 10% of the total proteome and is essential for gastric colonization.
2. Immunological Mechanism: Antigen Withdrawal
In nickel-sensitized individuals, dietary nickel triggers a Type IV (delayed) hypersensitivity reaction mediated through TLR-4 activation ahlstrom 2019 nickel allergy review:
- Nickel directly activates TLR-4 on dendritic cells and keratinocytes (unique to humans -- mice lack the relevant histidine residues)
- Both Th1 (IFN-gamma, IL-2, TNF-alpha) and Th2 (IL-5, IL-13) cytokines are produced
- IL-5 shows a statistically significant rise within 24 hours of oral nickel challenge bergman 2016 low nickel diet review
- IL-17/Th17 pathway activated in nickel-specific T cells, driving chronic low-grade inflammation lusi 2015 nickel allergy overweight
- Intestinal mucosa shows CD4+CD45RO+ cell infiltration with decreased CD8+ cells after nickel challenge di gioacchino 2018 snas chapter
Removing dietary nickel withdraws the antigenic stimulus, allowing the immune cascade to subside.
3. Metalloestrogen Removal
Nickel acts as a metalloestrogen -- it binds estrogen receptors and can induce proliferation of ERa+ cells borghini 2020 endometriosis nickel ibs. In estrogen-dependent conditions (endometriosis, PCOS), dietary nickel restriction removes this estrogenic stimulus in addition to the immunological and antimicrobial benefits.
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Clinical Evidence by Condition
SNAS -- Systemic Nickel Allergy Syndrome
The core indication. SNAS affects ~20% of nickel ACD patients and is characterized by both cutaneous (90%) and gastrointestinal (88%) symptoms after ingestion of nickel-rich foods braga 2013 snas nosologic framework.
| Study | Design | N | Key Result |
|-------|--------|---|------------|
| braga 2013 snas nosologic framework | Multicenter diet trial | 145 | 41.4% complete remission; 18.6% 70%+ improvement; BraMa-Ni diet 94.4% sensitivity, 93.3% specificity |
| di gioacchino 2018 snas chapter | Phase III NiOHT trial | 141 | GI symptoms more responsive than cutaneous; 1.5 ug Ni/week optimal dose |
| lombardi 2020 snas probiotics dysbiosis | Diet +/- probiotics | 51 | LNiD alone: 41.4% eubiosis; LNiD + probiotics: 72.7% eubiosis (p=0.026) |
SNAS symptoms confirmed by oral nickel challenge braga 2013 snas nosologic framework: Cutaneous (ACD flare-up, widespread eczema, urticaria, angioedema); Gastrointestinal (meteorism, gastric acidity, abdominal colic, diarrhea, vomiting, throat acidity). Headache, chronic fatigue, and dyspnea were NEVER induced by oral challenge and should not be considered diagnostic of SNAS.
Associated finding: Lactose intolerance occurs in 63-74% of SNAS patients, possibly from nickel-induced brush border enzymatic impairment di gioacchino 2018 snas chapter.
H. pylori Infection
| Study | Design | N | Key Result |
|-------|--------|---|------------|
| campanale 2014 nickel free diet h pylori | Randomized pilot | 52 | 84% eradication (NFD + triple therapy) vs 46% (triple therapy alone), p<0.01 |
Protocol: 30 days nickel-free diet with standard triple therapy (lansoprazole, clarithromycin, amoxicillin) starting at day 15. The 30-day pre-antibiotic nickel restriction period allows time for nickel depletion of urease and hydrogenase before antibiotic administration. This is the first study demonstrating that a dietary intervention can nearly double H. pylori eradication rates campanale 2014 nickel free diet h pylori.
GERD (Refractory)
| Study | Design | N | Key Result |
|-------|--------|---|------------|
| yousaf 2021 low nickel diet gerd | Prospective pilot | 20 | 95% improvement (19/20); GERD-HRQL decreased 27.05 points (p<0.001) |
All 20 patients had refractory GERD despite 3+ months of PPI therapy. Both nickel patch-test positive and negative patients responded equivalently, challenging the assumption that patch test positivity predicts diet responsiveness. Mean BMI was 35.24; patients lost ~3 kg on average yousaf 2021 low nickel diet gerd.
IBS (Nickel-Sensitive)
| Study | Design | N | Key Result |
|-------|--------|---|------------|
| rizzi 2017 ibs nickel diet | Prospective pilot | 20 | All GI symptoms improved (p<0.001 to p<0.0001) except vomiting; VAS efficacy 3.9 to 7.3 |
Critical finding: All IBS patients with nickel allergy had altered intestinal permeability at baseline (51Cr-EDTA 5.91% vs 2.20% controls, p<0.0001). IP change after diet correlated with nickel reactivity severity. IBS-M and IBS-U subtypes were more responsive. Lactose malabsorption present in 75% rizzi 2017 ibs nickel diet.
Celiac Disease (Refractory Symptoms on GFD)
| Study | Design | N | Key Result |
|-------|--------|---|------------|
| borghini 2020 low nickel diet celiac | Prospective pilot | 20 | 100% Ni ACM positivity in symptomatic celiac; LNiD improved 83.4% of tracked symptoms |
The gluten-free / nickel paradox: Patients on GFD experienced paradoxical symptom worsening (83.4% of symptoms WORSENED on prolonged GFD) because gluten-free substitutes (corn, buckwheat, chickpeas, lentils) are systematically high in nickel. Adding LNiD to GFD reversed this with the same magnitude of improvement. Both GI (abdominal pain, bloating, nausea, loose stools) and extraintestinal (dermatitis, headache, chronic fatigue, muscle/joint pain) symptoms responded borghini 2020 low nickel diet celiac. See dietary metal paradoxes Paradox 2.
Endometriosis
| Study | Design | N | Key Result |
|-------|--------|---|------------|
| borghini 2020 endometriosis nickel ibs | Open-label pilot | 31 | 90.3% Ni ACM positive; all 15 GI, 7 extraintestinal, and 3 gynecological symptoms improved (p<0.005 for gyn) |
The 90.3% Ni ACM prevalence in endometriosis patients with GI symptoms is the highest reported for any condition. Improvement extended beyond GI symptoms to the cardinal gynecological triad: dysmenorrhea, dyspareunia, and pelvic pain. The framework explains this through dual mechanisms: (1) nickel-dependent pathogen enzymes drive the endometriosis microenvironment (glyoxalase enables immune evasion, urease disrupts pH, hydrogenase creates hypoxia); (2) nickel as metalloestrogen stimulates estrogen-dependent lesion growth borghini 2020 endometriosis nickel ibs, pendergrass 2026 endometriosis conference.
Hand Eczema / Chronic Nickel Dermatitis
| Study | Design | N | Key Result |
|-------|--------|---|------------|
| kaaber 1978 low nickel diet chronic dermatitis | Challenge + diet trial | 28 | 17/28 reacted to oral Ni; 9/17 improved on 6-week LNiD; 7/9 relapsed on normal diet |
| veien 1993 low nickel diet trial | Open prospective | 90 | 64% short-term benefit; 73% long-term improvement (mean follow-up 1.8 years) |
| antico 1999 chronic dermatopathies nickel | Open + DBPC | 112 | 39% improved on LNiD; DBPC confirmed in 43/44 responders |
| sharma 2006 disulfiram low nickel diet hand eczema | Comparative single-blind | 21 | 90.9% clearance with LNiD + disulfiram vs 10% placebo (p<0.001) |
| atakan 1993 dyshidrosiform pemphigoid nickel | Case report | 1 | Complete clearance of dyshidrosiform pemphigoid in 15 days; failed dapsone and prednisolone |
Long-term outcomes: specific foods, menstrual period, psychological stress, and sweating identified as aggravating factors veien 1993 low nickel diet trial. Dermatitis types responding: vesicular hand eczema (67.7%), anogenital dermatitis (100%), vasculitis-like (66.7%) veien 1993 low nickel diet trial.
Obesity (Nickel-Sensitive Women)
| Study | Design | N | Key Result |
|-------|--------|---|------------|
| lusi 2015 nickel allergy overweight | Pilot cross-sectional + diet | 87 screened; 24 diet | Nickel allergy 59.7% in overweight women (p<0.001 vs general); normocaloric LNiD: BMI -4.2, body fat -5.1%, waist -11.7 cm (all p<0.001) |
The weight loss was achieved on a normocaloric diet -- the nickel restriction itself, not caloric deficit, drove the metabolic improvement. Proposed mechanisms: IL-17/Th17 inflammatory pathway, metalloestrogen-driven adipogenesis, gut microbiota disruption, and nickel's insulin-like metabolic effects lusi 2015 nickel allergy overweight.
CFS / Fibromyalgia
| Study | Design | N | Key Result |
|-------|--------|---|------------|
| regland 2001 nickel allergy cfs | Treatment response analysis | 204 | 52% of CFS women have nickel allergy; MELISA: 81% of non-responders Ni-reactive; allergic smokers: only 6% treatment response |
Case reports document dramatic improvement with LNiD and smoking cessation (cigarette smoke contains trace nickel). Dietary nickel and cigarette smoke nickel appear to synergistically maintain the chronic immune activation underlying fatigue and pain regland 2001 nickel allergy cfs.
Recurrent Aphthous Stomatitis
| Study | Design | N | Key Result |
|-------|--------|---|------------|
| pacor 2003 nickel recurrent aphthous stomatitis | DBPC oral challenge | 70 Ni-sensitive RAS patients | 45.7% DBPC-confirmed dietary nickel trigger; 21/32 improved on LNiD; reactive dose: 2.5 mg |
This study demonstrated that dietary nickel can perpetuate oral mucosal ulcers even after removal of orthodontic nickel sources. In 42/70 patients, symptoms persisted after appliance removal, confirming dietary nickel as the ongoing trigger pacor 2003 nickel recurrent aphthous stomatitis.
Atopic Dermatitis
| Study | Design | N | Key Result |
|-------|--------|---|------------|
| adachi 1997 low metal diet atopic dermatitis | Open clinical | 27 | 67% improvement (26% marked, 41% moderate); patients with metal contact history: 78% response |
This study used a broader low-metal diet (Ni, Cr, Co) plus dental metal elimination. Eosinophils and LDH decreased significantly in responders (p<0.05), providing objective immune modulation evidence adachi 1997 low metal diet atopic dermatitis.
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Practical Diet Guide
Target Intake
Sensitized individuals: 100-150 ug/day nickel mislankar 2013 low nickel diet scoring; the BraMa-Ni diet targets <50 ug/day for diagnostic use braga 2013 snas nosologic framework. Normal Western diets deliver 200-600 ug/day; some plant-forward diets can exceed 900 ug/day regland 2001 nickel allergy cfs.
The Point-Based Scoring System
The Mislankar-Zirwas scoring system assigns points based on nickel content per standard serving (10 ug = 1 point) mislankar 2013 low nickel diet scoring:
- Adults: No more than 15 points/day
- Children under 12: No more than 10 points/day
- Very sensitive individuals: Stay under 5 points/day
- Diet may take up to 2 months for full clinical benefit
High-Nickel Foods (AVOID -- >100 ug/serving)
| Food | Nickel (ug/serving) | Points |
|------|---------------------|--------|
| Lima beans, pinto beans, refried beans | >100 | Avoid |
| Sunflower seeds | >100 | Avoid |
| Chili with beans (canned) | >100 | Avoid |
| Chocolate cake with icing | >100 | Avoid |
| Oat ring cereal | >100 | Avoid |
| Mussels | ~154 | Avoid |
| Spirulina | ~151 | Avoid |
| Soy products | 0.1-5.1 mg/kg | Avoid |
| Cocoa/chocolate | 3.0-12 ug/g | Avoid |
flyvholm 1984 nickel food content, bergman 2016 low nickel diet review
Full high-nickel food categories braga 2013 snas nosologic framework, borghini 2020 endometriosis nickel ibs:
- Legumes: All beans, lentils, chickpeas, peas, peanuts, soy
- Whole grains: Oats, buckwheat, millet, whole wheat, rye, maize, corn
- Nuts and seeds: All types (almonds, walnuts, hazelnuts, cashews, sunflower seeds)
- Chocolate and cocoa: All forms
- Canned foods: Nickel leaches from metal cans
- Specific vegetables: Spinach, tomatoes, asparagus, cauliflower, onions, raw carrots
- Specific seafood: Mussels, oysters, shellfish, lobster, herring, mackerel
- Beverages: Black tea, coffee, red wine, beer (variable)
- Other: Baking powder, margarine
Low-Nickel Foods (SAFE -- 0 points)
| Food | Nickel (ug/serving) |
|------|---------------------|
| Apple | <1 |
| Butter | <1 |
| Cheddar cheese | <1 |
| Chicken breast (skin removed) | <1 |
| Cottage cheese | <1 |
| Eggs | <1 |
| Eggplant | <1 |
| Honey | <1 |
| Ice cream | <1 |
| Milk | <1 |
| Olive oil | <1 |
| Steak / red meat | <1 |
| Sugar | <1 |
| Tuna (canned) | <1 |
mislankar 2013 low nickel diet scoring
BraMa-Ni permitted foods braga 2013 snas nosologic framework: Semi-skimmed milk, white yogurt, rice, zucchini, chicken/lean meat, lettuce, bread (00 refined flour), apple, pasta/rice in vegetable broth, peppers, eggplant, fruit.
Strategies to Reduce Nickel Absorption
Vitamin C with meals. Ascorbic acid acts as a competitive inhibitor of nickel absorption in the GI tract. Take 500-1000 mg chewable vitamin C with every meal mislankar 2013 low nickel diet scoring, zirwas 2009 dietary nickel dermatitis.
Iron-rich foods. Iron competes with nickel for absorption via shared divalent metal transporters (DMT1). Maintaining adequate iron intake reduces nickel absorption zirwas 2009 dietary nickel dermatitis.
Avoid stainless steel cookware for acidic foods. Nickel leaches from stainless steel during cooking, especially with tomato sauce, citrus, or vinegar. First use of new stainless steel releases the most nickel zirwas 2009 dietary nickel dermatitis.
Flush first quart of tap water. Nickel-plated faucets release nickel into standing water. Run the faucet briefly before using water for drinking or cooking. Use bottled or distilled water for maximum restriction mislankar 2013 low nickel diet scoring.
Avoid nonstick, aluminum, copper, and cast iron cookware during strict LNiD phases mislankar 2013 low nickel diet scoring.
No vitamins/supplements except vitamin C during the restriction phase (many contain trace nickel) mislankar 2013 low nickel diet scoring.
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Adjunctive Therapies
Disulfiram (Nickel Chelator)
Disulfiram (tetraethyl thiuram disulphide) chelates nickel in the body; its metabolite diethyldithiocarbamate causes nickel excretion through urine, bile, and sweat. Combined LNiD + disulfiram achieved 90.9% complete clearance in vesicular hand eczema (vs 10% placebo, p<0.001) sharma 2006 disulfiram low nickel diet hand eczema.
Protocol: 125 mg/day for 2 weeks, then 250 mg/day for 2 weeks, alongside LNiD.
Risks: Metallic taste (27%), mild drowsiness (18%), anorexia, and mild liver enzyme elevation in 27.3% of patients. Hepatotoxicity requires monitoring. Absolute contraindication with alcohol (disulfiram-ethanol reaction). Use should be reserved for severe or refractory cases sharma 2006 disulfiram low nickel diet hand eczema, zirwas 2009 dietary nickel dermatitis.
Oral Nickel Hyposensitization (NiOH / NiOHT)
Graduated oral administration of nickel sulphate to induce immune tolerance in SNAS patients.
| Study | N | Protocol | Result |
|-------|---|----------|--------|
| schiavino 2006 oral hyposensitization nickel | 136 treated + 95 controls | 0.1 ng to 0.1 mg over ~6 months | 69.1% complete remission (vs 17.9% controls); ARR 51.2%; NNT = 1.95 |
| minelli 2010 nioh cytokines snas | 24 treated + 12 controls | 0.3 ng to 1.5 ug/week for 10 weeks | 87% remained symptom-free after reintroducing all Ni-rich foods; IFN-gamma -55.3%, IL-13 -58.6%, IL-5 -31.2% |
The NiOH protocol induces true oral tolerance -- not just symptom suppression. Cytokine analysis confirms immune modulation: significant reduction in both Th1 (IFN-gamma) and Th2 (IL-5, IL-13) responses, mediated by IL-10 increase and regulatory T cell induction minelli 2010 nioh cytokines snas. The extremely low starting dose (0.1 ng) is critical -- earlier studies using 3.5-5 mg caused relapse in 60% schiavino 2006 oral hyposensitization nickel.
Probiotics + LNiD
LNiD alone restores gut eubiosis in only 41.4% of SNAS patients; adding targeted probiotics raises this to 72.7% (p=0.026) lombardi 2020 snas probiotics dysbiosis.
Strain selection by dysbiosis type:
- Fermentative dysbiosis (64.7% of SNAS patients): Lactobacilli-containing formulations
- Putrefactive dysbiosis (3.9%): Bifidobacteria-containing formulations
- Mixed dysbiosis (31.4%): Broad-spectrum multi-strain formulations
Limitation: Benefits maintained only 4-6 weeks after stopping combined therapy, suggesting ongoing microbiome dependency. This temporal pattern is consistent with the nickel restriction paradox: LNiD improves symptoms by reducing nickel-mediated inflammation but may simultaneously impair commensal bacteria that depend on nickel (see dietary metal paradoxes Paradox 9) lombardi 2020 snas probiotics dysbiosis, maier 2019 nickel microbial pathogenesis.
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The Dietary Paradox
A low-nickel diet creates a structural conflict with several widely recommended dietary patterns, because many of the foods highest in nickel are the same foods promoted as "healthy" by conventional nutrition guidance.
Paradox 1: Plant-Based Diets
Anti-inflammatory and plant-forward diets prescribed for endometriosis, PCOS, IBD, and rheumatoid arthritis emphasize legumes, whole grains, nuts, seeds, and cruciferous vegetables -- precisely the highest-nickel foods. For the 15-20% of the population with nickel sensitivity, these diets may trigger SNAS and Ni ACM, actively worsening the conditions they are prescribed to treat dietary metal paradoxes.
Harris et al. (2018) found that in 70,835 women, citrus fruits (low nickel) reduced endometriosis risk by 22%, while cruciferous vegetables, corn, and peas/lima beans (high nickel) increased risk by 13-30% -- a pattern invisible without the nickel lens.
Paradox 2: Gluten-Free Diet / Nickel Load Switch
Celiac patients replacing wheat with corn, rice, buckwheat, and legume-based products substitute one dietary trigger (gluten) for another (nickel). The GFD works immunologically (antibodies normalize) but can fail clinically due to Ni ACM from high-nickel GF staples borghini 2020 low nickel diet celiac.
Paradox 3: The Commensal Casualty
Nickel is not only used by pathogens. Commensal gut bacteria (Bifidobacterium, Lactobacillus) also use Ni-urease for acid tolerance and nitrogen metabolism. Restricting nickel may create collateral damage to beneficial microbiota, explaining why probiotics provide additional benefit when combined with LNiD maier 2019 nickel microbial pathogenesis, lombardi 2020 snas probiotics dysbiosis.
Full analysis: dietary metal paradoxes
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Diagnosis -- When to Recommend a Low-Nickel Diet
Diagnostic Methods
Epicutaneous patch test (gold standard for sensitization): 5% nickel sulfate hexahydrate in petrolatum, applied under occlusion for 48 hours, read at 48 and 72-96 hours ahlstrom 2019 nickel allergy review. Note: timing matters in fertile women -- testing during the progestinic phase is recommended, as ovulatory-phase testing may produce false negatives bonamonte 2005 nickel allergy menstrual cycle.
Nickel oral mucosa patch test (Ni omPT): 5-mm filter paper disk with 5% Ni-sulfate in Vaseline applied to upper lip mucosa for 2 hours. Detects Ni ACM -- the gastrointestinal/mucosal manifestation that epicutaneous patch testing may miss borghini 2020 endometriosis nickel ibs.
Oral nickel challenge (DBPC): Gold standard for SNAS diagnosis. Challenge with nickel sulphate at increasing doses (1.25, 2.5, 3.5, 5.0 mg elemental nickel) after improvement on LNiD braga 2013 snas nosologic framework. Dose-response: 0.3 mg provokes reactions in 40% of sensitized individuals; 4 mg in 70% zirwas 2009 dietary nickel dermatitis.
BraMa-Ni scoring system: Nutritionally balanced diagnostic diet (~50 ug Ni/day; 1932 kcal men, 1733 kcal women) with 94.4% sensitivity and 93.3% specificity for detecting SNAS. Patient adherence nearly 100% (vs 26.8% for simple forbidden food lists, p=0.001) braga 2013 snas nosologic framework.
MELISA (lymphocyte proliferation test): Found 81% (13/16) of CFS vaccine non-responders reacted to nickel. May detect nickel sensitivity missed by patch testing regland 2001 nickel allergy cfs.
When to Screen
Screen for nickel sensitivity BEFORE prescribing plant-forward diets in:
- Endometriosis with GI symptoms -- 90.3% Ni ACM prevalence warrants routine testing borghini 2020 endometriosis nickel ibs
- Celiac with persistent symptoms on GFD -- 100% Ni ACM prevalence in symptomatic subgroup borghini 2020 low nickel diet celiac
- IBS or IBS-like symptoms in women -- given 14-20% nickel allergy prevalence in women
- Refractory GERD despite PPI therapy -- 95% responded to LNiD yousaf 2021 low nickel diet gerd
- Chronic hand eczema / vesicular dermatitis with positive nickel patch test and incomplete response to topical therapy
- Recurrent aphthous stomatitis persisting after orthodontic appliance removal pacor 2003 nickel recurrent aphthous stomatitis
- Overweight women with nickel allergy -- 59.7% prevalence in overweight females lusi 2015 nickel allergy overweight
- CFS/fibromyalgia in women -- 52% nickel allergy prevalence regland 2001 nickel allergy cfs
- Any condition where a plant-forward diet produces paradoxical symptom worsening -- consider nickel sensitivity before attributing the response to FODMAPs or generic food intolerances
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Summary Evidence Table
| Condition | N | Key Outcome | Source |
|-----------|---|-------------|--------|
| SNAS (diagnosis + treatment) | 145 | 94.4% sensitivity / 93.3% specificity (BraMa-Ni); 41.4% complete remission | braga 2013 snas nosologic framework |
| H. pylori eradication | 52 | 84% vs 46% (p<0.01) | campanale 2014 nickel free diet h pylori |
| Refractory GERD | 20 | 95% improved; GERD-HRQL -27.05 (p<0.001) | yousaf 2021 low nickel diet gerd |
| IBS (nickel-sensitive) | 20 | All symptoms improved (p<0.001); VAS 3.9 to 7.3 | rizzi 2017 ibs nickel diet |
| Celiac (refractory on GFD) | 20 | 83.4% of symptoms improved; 100% Ni ACM positive | borghini 2020 low nickel diet celiac |
| Endometriosis | 31 | 90.3% Ni ACM; all GI + gyn symptoms improved (p<0.005) | borghini 2020 endometriosis nickel ibs |
| Hand eczema + disulfiram | 21 | 90.9% clearance (p<0.001) | sharma 2006 disulfiram low nickel diet hand eczema |
| Hand eczema (long-term) | 90 | 64% short-term; 73% long-term improvement | veien 1993 low nickel diet trial |
| Chronic dermatopathies | 112 | 39% improved; DBPC confirmed 43/44 | antico 1999 chronic dermatopathies nickel |
| Obesity (Ni-allergic women) | 24 | BMI -4.2; body fat -5.1%; waist -11.7 cm (normocaloric) | lusi 2015 nickel allergy overweight |
| CFS/fibromyalgia | 204 | 52% nickel allergy; 81% MELISA-positive non-responders | regland 2001 nickel allergy cfs |
| Aphthous stomatitis | 70 | 45.7% DBPC-confirmed; 21/32 improved on LNiD | pacor 2003 nickel recurrent aphthous stomatitis |
| Atopic dermatitis | 27 | 67% improvement with low-metal diet | adachi 1997 low metal diet atopic dermatitis |
| NiOH hyposensitization | 136 + 95 | 69.1% complete remission; NNT=1.95 | schiavino 2006 oral hyposensitization nickel |
| NiOH + cytokines | 36 | 87% symptom-free on full diet; IFN-gamma -55.3% | minelli 2010 nioh cytokines snas |
| SNAS + probiotics | 51 | 72.7% eubiosis (diet + probiotics) vs 41.4% (diet alone) | lombardi 2020 snas probiotics dysbiosis |
| Dyshidrosiform pemphigoid | 1 | Complete clearance in 15 days (failed steroids) | atakan 1993 dyshidrosiform pemphigoid nickel |
| Pioneering 1978 study | 28 | 17/28 reacted to oral Ni; 9/17 improved on LNiD | kaaber 1978 low nickel diet chronic dermatitis |
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Connections
Entities: nickel, helicobacter pylori, staphylococcus aureus, candida albicans, proteus mirabilis
Enzymes: urease, hydrogenase, nickel glyoxalase
Concepts: nutritional immunity, dietary nickel exposure, nickel allergy, metalloestrogens, inflammation
Analyses: dietary metal paradoxes
Key source reviews: maier 2019 nickel microbial pathogenesis (40+ pathogen species), di gioacchino 2018 snas chapter (SNAS comprehensive review), bergman 2016 low nickel diet review (patient-centered review), ahlstrom 2019 nickel allergy review (clinical review)
Diet references: flyvholm 1984 nickel food content (foundational food nickel data), mislankar 2013 low nickel diet scoring (point system), braga 2013 snas nosologic framework (BraMa-Ni diet), zirwas 2009 dietary nickel dermatitis (practical guide)