What is the best food sensitivity test that is not a scam?

Short answer: there isn’t a single reliable commercial “food sensitivity” panel that proves a food is causing non‑allergic symptoms. The best approach is to use validated tests for specific conditions (allergy, celiac, carbohydrate malabsorption, SIBO) and/or a professionally supervised elimination/rechallenge. Avoid broad IgG food‑panel kits sold direct‑to‑consumer — they’re not diagnostic.

What I recommend (by condition), with specific labs/services and why:

• Suspected immediate allergy (hives, swelling, throat tightness, anaphylaxis)

  • See an allergist for skin‑prick testing and/or serum specific IgE testing (ImmunoCAP by Thermo Fisher/Phadia is the clinical standard).
  • Why: these tests are validated for true IgE‑mediated allergy and an allergist can do (or arrange) a supervised oral food challenge if needed.

• Suspected celiac disease

  • Get tissue transglutaminase IgA (tTG‑IgA) + total IgA from a clinical lab (Quest Diagnostics, LabCorp, Mayo Clinic Laboratories).
  • Why: serology for celiac is well validated; labs above are reputable and used by clinicians.

• Suspected lactose/fructose malabsorption or SIBO (bloating, gas, diarrhea after carbs)

  • Get a hydrogen/methane breath test through a GI clinic or hospital lab (many use QuinTron equipment).
  • Why: breath testing is the accepted functional test for lactose/fructose intolerance and SIBO when done and interpreted properly.

• Non‑specific, delayed GI/extraintestinal symptoms (brain fog, fatigue, chronic IBS‑type symptoms)

  • The most reliable route is a diagnostic elimination diet with systematic reintroduction supervised by a registered dietitian (find one through the Academy of Nutrition and Dietetics).
  • Why: elimination + double‑blind reintroduction is the practical “gold standard” for food‑trigger identification when no IgE/celiac/malabsorption problem is present.

What to avoid

• Commercial IgG / IgG4 food panels (examples: Everlywell food sensitivity test, Vibrant Wellness Food Inflammation Panel, many direct‑to‑consumer panels) — professional societies (AAAI, British Dietetic Association, others) advise against using IgG tests to diagnose food intolerance because IgG often reflects exposure or tolerance, not pathological sensitivity.
• Unvalidated specialty tests marketed to “find hidden food sensitivities” (cytotoxic tests, MRT/mediator release tests) — evidence is weak or absent.

Next steps

• If you have immediate allergy symptoms: see an allergist now.
• If you have chronic GI symptoms: start with your primary care or GI doctor for appropriate labs (tTG, breath tests) and ask for referral to a registered dietitian for a supervised elimination diet.
• If you want help finding clinicians: use AAAAI’s allergist finder, Academy of Nutrition and Dietetics’ RD locator, or major lab network locations (Quest/LabCorp/Mayo) for validated blood tests and breath testing referrals.

If you tell me your main symptoms (immediate reactions vs chronic GI vs rashes/brain‑fog), I can recommend the single best next test and how to arrange it.