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Food Sensitivity

Food sensitivity refers to adverse symptoms that occur after consuming certain foods, but that do not involve the immediate immune response seen in a true food allergy. Food sensitivities are different from both food allergies and many food intolerances, although symptoms may overlap. The mechanisms behind food sensitivities are not always fully understood, and reactions can vary significantly between individuals.¹²

Unlike a food allergy, which can trigger potentially life-threatening reactions, food sensitivities generally produce delayed symptoms that may develop hours or even days after consuming a trigger food. Because symptoms can be diverse and nonspecific, identifying problematic foods can sometimes be challenging.³

Common Symptoms and Signs:

Food sensitivities occur when certain foods trigger undesirable symptoms in susceptible individuals. Researchers believe that factors such as digestive function, gut microbiome composition, intestinal permeability, immune system activity, and individual biochemical differences may contribute to food sensitivities.⁴

Common foods frequently reported as triggers include:

Dairy products
Wheat and gluten-containing foods
Eggs
Soy
Corn
Tree nuts
Peanuts
Food additives and preservatives
Artificial sweeteners
Certain fruits and vegetables⁵

It is important to distinguish food sensitivities from food allergies and medically diagnosed food intolerances.

Symptoms vary widely and may affect multiple body systems.

Digestive Symptoms

Bloating
Gas
Abdominal discomfort
Diarrhea
Constipation
Nausea
Indigestion

Neurological and Cognitive Symptoms

Brain fog
Difficulty concentrating
Headaches
Migraines
Mental fatigue

Skin Symptoms

Itching
Rashes
Eczema flare-ups
Skin irritation

General Symptoms

Fatigue
Joint discomfort
Muscle aches
Low energy
Sleep disturbances

Mood-Related Symptoms

Irritability
Anxiety
Mood fluctuations
Reduced stress tolerance⁶⁷

Symptoms may occur shortly after eating or be delayed for several hours or days, making trigger identification more difficult.

Common Stressors:

Emotional Stressors

Stress can influence digestive function, immune activity, and symptom perception.

Chronic Stress

Long-term stress may affect the gut-brain axis and contribute to digestive symptom flare-ups.

Anxiety

Anxiety can increase gastrointestinal sensitivity and symptom awareness.

Depression

Depression may influence digestive health, appetite regulation, and overall well-being.

Workplace Stress

High workloads
Tight deadlines
Occupational burnout
Job insecurity

Relationship Challenges

Family conflict
Caregiving demands
Social isolation
Marital difficulties

Major Life Events

Financial hardship
Relocation
Loss of a loved one
Significant life transitions⁸⁹

While emotional stress does not directly cause food sensitivities, it may contribute to symptom severity in some individuals.

Frequently Asked Questions

If you are having these issues, please make an appointment to talk about your options, complete some test, and then we will develop a plan to fit you.

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Resources:

American Academy of Allergy, Asthma & Immunology (AAAAI) – Food Allergy vs Food Intolerance
National Institute of Allergy and Infectious Diseases (NIAID) – Food Allergy Guidelines
Mayo Clinic – Food Allergy and Food Intolerance Overview
Harvard Health Publishing – The Gut-Immune Connection
Academy of Nutrition and Dietetics – Food Sensitivities and Intolerances
Cleveland Clinic – Food Intolerance and Sensitivity Information
MedlinePlus – Food Allergy and Intolerance Information
American Psychological Association – Stress and Digestive Health
National Institute of Mental Health (NIMH) – Coping With Stress
National Institutes of Health (NIH) – Sleep and Health
National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) – Digestive Health Information
Harvard T.H. Chan School of Public Health – Nutrition Source
International Foundation for Gastrointestinal Disorders (IFFGD) – Food and Digestive Health Resources
World Health Organization – Environmental Health
U.S. Environmental Protection Agency – Health and Environment Topics
Academy of Nutrition and Dietetics – Find a Nutrition Expert