🥜 Food Allergy vs Food Intolerance Simulator

Immune vs Non-Immune Reaction Pathways

Two different biological systems drive food reactions.

• Immune: Allergy pathway (IgE antibodies involved)
• Non-immune: Intolerance pathway (Enzyme or chemical basis)
• ~8%: Global food allergy rate (children, approx.)
• ~65%: Lactose intolerance rate (adults worldwide, approx.)

Immune system engagement

Allergy involves antibodies; intolerance does not, placeholder text.

Rapid Mast Cell Degranulation Response

IgE cross-linking triggers fast histamine release.

• <30 min: Typical onset (after allergen exposure)
• Histamine: Key mediator (released from mast cells)
• IgE: Key antibody (binds allergen and receptor)
• Anaphylaxis: Worst outcome (systemic, life-threatening)

Sensitization and re-exposure

First exposure sensitizes; second exposure triggers reaction, placeholder.

Lactase Deficiency and Delayed Digestive Symptoms

Missing enzyme leads to slow bacterial fermentation symptoms.

• 30–120 min: Typical onset (after ingestion)
• Lactase: Missing enzyme (breaks down lactose sugar)
• Fermentation: Symptom source (gut bacteria produce gas)
• None: Immune cells involved (purely digestive mechanism)

Undigested sugar fermentation

Bacteria ferment lactose producing gas and bloating, placeholder.

Life-Threatening Anaphylaxis vs Mild Discomfort

Allergy severity can escalate quickly; intolerance stays mild.

• Anaphylaxis: Allergy worst case (airway, blood pressure risk)
• Discomfort: Intolerance worst case (cramps, bloating, diarrhea)
• Allergy only: Fatality risk (intolerance rarely fatal)
• Intolerance: Dose dependence (symptoms scale with amount)

Risk stratification

Severity differs sharply between the two mechanisms, placeholder.

Differentiating Tests for Allergy and Intolerance

Different tests confirm each mechanism accurately.

• Skin prick/IgE: Allergy test (detects specific antibodies)
• Breath test: Intolerance test (measures hydrogen gas)
• Both: Elimination diet (used for confirmation)
• Oral challenge: Gold standard allergy (supervised food challenge)

Choosing the right test

Testing approach depends on suspected mechanism, placeholder.

Correct diagnosis prevents unnecessary food avoidance, placeholder sentence.