Food Sensitivities

topic

Food sensitivities — distinct from IgE-mediated food allergies (immediate immune response) — are delayed immune and non-immune reactions to specific food components that produce systemic inflammatory, neurological, and gastrointestinal effects over hours to days following consumption, making the connection to the offending food invisible without systematic elimination-reintroduction protocols. Common food sensitivity targets include gluten (producing neurological manifestations in non-celiac gluten sensitivity), dairy (through casein and lactose), nightshades, high-FODMAP foods, and food additives.

Role

Food sensitivities are among the most clinically underdiagnosed contributors to chronic systemic symptoms — with the delayed nature of reactions (12–48 hours after consumption) making self-identification essentially impossible without structured elimination protocols, and with the neurological manifestations of food sensitivities (brain fog, mood changes, anxiety, fatigue) being almost never evaluated through a dietary lens in standard medical assessment. The person who has spent years managing chronic fatigue, brain fog, or mood instability through pharmaceutical and psychological means without having undergone a structured elimination diet trial may be managing symptoms whose primary driver is an unidentified food sensitivity — a possibility that costs nothing to investigate and that, when confirmed, produces resolution of symptoms that nothing else has relieved.

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