Verbatim response from Perplexity
The best food sensitivity test that is not a scam is not a commercial test at all; the gold standard is a supervised elimination diet where you systematically remove and reintroduce foods while tracking symptoms under the guidance of a healthcare provider or dietitian [2][8].
Why Commercial Tests Are Considered Scams
Most direct-to-consumer "food sensitivity" tests (such as Everlywell, YorkTest, or Check My Body Health) measure IgG antibodies, which medical organizations have explicitly warned against using for diagnosis [3][5].
- IgG reflects exposure, not intolerance: Higher IgG levels often indicate that you have tolerated a food, not that it harms you [3][5].
- High false-positive rate: These tests frequently flag foods you eat regularly, leading to unnecessary and potentially nutritionally harmful diets [6][11].
- No FDA approval: The FDA has not approved any food-sensitivity tests for diagnosing intolerances [6].
- Expert consensus: Major organizations, including the American Academy of Allergy, Asthma & Immunology (AAAAI) and the Canadian Society of Allergy and Clinical Immunology, recommend against using IgG tests for this purpose [5][6][11].
The Only Validated Testing Methods
If you have specific medical concerns, the only evidence-based tests are clinical procedures performed by a doctor, not at-home kits:
- For Food Allergies (IgE): Use the ImmunoCAP serum test or skin prick testing, performed by a clinic (Quest Diagnostics, LabCorp) [3].
- For Lactose/SIBO Intolerance: Use a hydrogen (and methane) breath test performed by a GI clinic [3].
- For Celiac Disease: Use tTG/DGP blood tests followed by an endoscopy [3].
Recommendation
Skip the at-home blood test kits. Instead, consult a registered dietitian or allergist to begin a professional elimination diet, which is the only method proven to identify real food sensitivities without the risk of false results [2][8].