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Comprehensive Guide
Food sensitivities are one of the most common and most overlooked drivers of chronic symptoms — from brain fog and fatigue to joint pain and skin issues. An elimination diet is the gold standard for identifying your personal triggers. This guide gives you the complete, systematic protocol.
8
Top allergens and triggers
21-30
Day elimination phase
72 hrs
Between each reintroduction
6
Key gut-healing nutrients
The Foundation
An elimination diet is a structured protocol that removes suspected trigger foods for a defined period, then systematically reintroduces them one at a time to identify which foods cause adverse reactions.
The elimination diet works because it gives your immune system time to calm down. When you continuously eat a food your body reacts to, the immune system stays activated — producing IgG antibodies, inflammatory cytokines, and maintaining intestinal permeability. This creates a chronic, low-grade inflammatory state where symptoms become your “normal.”
By removing all suspected triggers simultaneously for 21-30 days, circulating IgG antibodies decline, the gut lining begins to heal, and baseline inflammation drops. When you then reintroduce foods one at a time, reactions become obvious — symptoms that were masked by chronic exposure suddenly stand out in sharp contrast against a clean baseline.
Despite advances in food sensitivity testing (IgG panels, mediator release tests, cell-based assays), the elimination diet with systematic reintroduction remains the gold standard for identifying food sensitivities. The American Academy of Allergy, Asthma, and Immunology (AAAAI) and most functional medicine practitioners consider it more accurate and reliable than any blood test. It is also the most cost-effective approach — it requires no lab fees, only discipline and a detailed journal.
Key Distinctions
These three terms are often used interchangeably but describe fundamentally different biological mechanisms. Understanding the difference determines your approach.
IgE-Mediated — Immediate
IgG/IgA-Mediated — Delayed
Enzyme-Mediated — Non-Immune
IgE testing (performed by allergists) is well-validated and reliably identifies true food allergies. IgG food sensitivity panels, while commercially popular, remain controversial in mainstream medicine. The key concern is that IgG antibodies to food may simply reflect immune exposure and tolerance — not pathological sensitivity. A 2008 AAAAI position statement explicitly warned against using IgG testing to diagnose food sensitivities.
However, some functional medicine practitioners find IgG panels useful as a starting point — not as a definitive diagnosis, but to guide which foods to prioritize during an elimination protocol. The critical point is that no blood test replaces the elimination-reintroduction process. If a food shows high IgG but you tolerate it perfectly on reintroduction, the IgG result was clinically irrelevant. Trust the reintroduction challenge over any lab result.
Know Your Triggers
These 8 food groups account for the vast majority of food sensitivities. Understanding each one's mechanism, symptoms, and hidden sources is critical for a successful elimination.
Prevalence: ~6% non-celiac sensitivity, ~1% celiac
Common Symptoms
Bloating, brain fog, joint pain, fatigue, skin rashes, headaches, depression, neuropathy
Mechanism
Gluten triggers zonulin release in the intestinal lining, which opens tight junctions between epithelial cells and increases intestinal permeability. In celiac disease, gluten activates a severe autoimmune response that destroys intestinal villi. In non-celiac gluten sensitivity (NCGS), the mechanism is less clear but involves innate immune activation and increased intestinal permeability without villous atrophy.
Hidden Sources
Soy sauce, beer, salad dressings, processed meats, medications, supplements, cosmetics, cross-contaminated oats
Prevalence: ~65% lactose intolerance globally, ~2-3% casein sensitivity
Common Symptoms
Bloating, gas, diarrhea, constipation, acne, eczema, sinus congestion, joint pain, brain fog
Mechanism
Dairy reactions can be immune-mediated (casein or whey protein sensitivity, involving IgG/IgA) or enzyme-mediated (lactose intolerance from lactase deficiency). A1 beta-casein (from conventional Holstein cows) is more inflammatory than A2 casein (from Jersey, Guernsey, and goat milk). Casein has a molecular structure similar to gluten and can cross-react in sensitive individuals.
Hidden Sources
Whey protein, casein in processed foods, butter (contains trace casein), medications, protein bars, non-dairy creamers with caseinates
Prevalence: ~1-2% of adults
Common Symptoms
Digestive distress, skin reactions (eczema, hives), respiratory symptoms, headaches, joint pain
Mechanism
Egg whites contain several allergenic proteins: ovomucoid, ovalbumin, ovotransferrin, and lysozyme. Egg yolks are less allergenic and are tolerated by some who react to whites. Cooking denatures some egg proteins (ovalbumin is heat-labile), so some individuals tolerate well-cooked eggs but react to soft-cooked or raw eggs. Egg sensitivity is often associated with gut permeability issues.
Hidden Sources
Baked goods, mayonnaise, vaccines (influenza), pasta, meatballs, some wines (fining agent), marshmallows, shampoos
Prevalence: ~0.4% of adults
Common Symptoms
Digestive upset, skin reactions, hormonal disruption, bloating, fatigue, brain fog
Mechanism
Soy contains multiple allergenic proteins (Gly m 1-8) and phytoestrogens (isoflavones) that can disrupt endocrine function. Soy also contains trypsin inhibitors that impair protein digestion and lectins that can irritate the gut lining. Fermented soy (miso, tempeh, natto) is generally better tolerated than unfermented soy because fermentation breaks down many of the problematic proteins and anti-nutrients.
Hidden Sources
Soybean oil, soy lecithin (emulsifier in chocolate, supplements), soy sauce, tofu, edamame, processed foods, vegetable protein, infant formula
Prevalence: ~1% estimated (underreported)
Common Symptoms
Bloating, headaches, joint pain, brain fog, skin reactions, fatigue, mood changes
Mechanism
Corn sensitivity is often underdiagnosed because corn derivatives are ubiquitous in the food supply. Corn proteins (zeins) can trigger immune responses, and corn is one of the most heavily genetically modified and pesticide-treated crops. Corn-derived ingredients include high-fructose corn syrup, corn starch, corn oil, maltodextrin, dextrose, citric acid (often corn-derived), and modified food starch.
Hidden Sources
High-fructose corn syrup, maltodextrin, dextrose, citric acid, corn starch, corn oil, xanthan gum, medications (excipients), adhesives on envelopes
Prevalence: ~1-2% tree nuts, ~1-2% peanuts
Common Symptoms
Digestive distress, skin reactions, respiratory symptoms, anaphylaxis (IgE allergy), headaches, joint pain
Mechanism
Peanuts (legumes) and tree nuts contain multiple allergenic proteins that can trigger both IgE-mediated allergies and delayed IgG sensitivities. Peanuts contain aflatoxins (mold-derived carcinogens) when stored improperly. Tree nut cross-reactivity is common — sensitivity to one tree nut increases risk of reacting to others. Soaking and sprouting can reduce phytic acid and lectins but does not eliminate allergenic proteins.
Hidden Sources
Nut oils, pesto, marzipan, praline, nougat, Asian cuisine, baked goods, cereal, granola, nut milks, cosmetics
Prevalence: ~2-3% shellfish, ~0.4% finfish
Common Symptoms
Hives, digestive distress, respiratory symptoms, anaphylaxis, headaches, joint pain
Mechanism
Shellfish allergy is caused by tropomyosin, a muscle protein common to crustaceans (shrimp, crab, lobster) and mollusks (clams, oysters, squid). Cross-reactivity between crustaceans and mollusks is common. Fish allergy is caused by parvalbumin, a calcium-binding protein. Fish allergy and shellfish allergy are independent — having one does not predict the other. Histamine in improperly stored fish can cause scombroid poisoning, which mimics allergy.
Hidden Sources
Caesar dressing (anchovies), Worcestershire sauce, Asian fish sauce, glucosamine (shellfish-derived), surimi (imitation crab), omega-3 supplements
Prevalence: ~unknown (not a top-8 allergen, but common sensitivity)
Common Symptoms
Joint pain, joint stiffness, digestive distress, skin inflammation, nerve pain, muscle aches
Mechanism
Nightshades (tomatoes, peppers, potatoes, eggplant) contain glycoalkaloids (solanine, tomatine, capsaicin) that can increase intestinal permeability and stimulate the immune system in sensitive individuals. Nightshade sensitivity is particularly common in people with autoimmune conditions, arthritis, and inflammatory bowel disease. Glycoalkaloids inhibit cholinesterase, potentially affecting nerve and muscle function. Cooking reduces but does not eliminate glycoalkaloids.
Hidden Sources
Paprika, cayenne, chili flakes, potato starch, tomato paste in sauces, goji berries, ashwagandha (nightshade family), some medications
Want This Personalized?
This guide gives you the science. A CryoCove coach gives you the personalization — the right dose, timing, and integration with your other 8 pillars.
Phase 1
This is the most critical phase. Strict compliance for a minimum of 21 days — ideally 30 — allows your immune system to calm down and establishes the clean baseline you need for accurate reintroduction.
Select how many food groups to eliminate based on your symptom severity and goals.
A successful elimination diet begins with 3-5 days of preparation.
Strict removal of all target foods with no exceptions.
Before reintroduction, evaluate how you feel after the elimination phase.
Wild-caught fish (salmon, cod, halibut, sole), grass-fed beef, bison, lamb, pasture-raised poultry (chicken, turkey), organ meats, wild game (venison, elk)
Leafy greens (kale, spinach, arugula, chard), cruciferous vegetables (broccoli, cauliflower, Brussels sprouts, cabbage), root vegetables (sweet potatoes, beets, carrots, parsnips, turnips), zucchini, squash, asparagus, celery, cucumber, artichoke
Berries (blueberries, raspberries, blackberries, strawberries), apples, pears, stone fruits (peaches, plums, cherries), bananas, kiwi, melon, grapes, citrus (if not histamine-sensitive)
Extra virgin olive oil, coconut oil, avocado oil, avocados, olives, coconut milk (full-fat, canned), ghee (if dairy-sensitive — ghee has virtually no casein or lactose)
White rice, sweet potatoes, potatoes (if not avoiding nightshades), plantains, taro, cassava (yuca), arrowroot, tapioca
Fresh herbs (basil, cilantro, parsley, mint, dill, rosemary, thyme, oregano), ginger, turmeric, sea salt, black pepper, garlic (if not low-FODMAP), cinnamon, cumin
Filtered water, herbal teas (chamomile, ginger, peppermint, rooibos), bone broth, coconut water, sparkling mineral water
Track Everything
Your symptom journal is the most important tool in the elimination diet. Track these categories daily, rating severity 0-10, to identify patterns and confirm food reactions during reintroduction.
Phase 2
Reintroduction is where you get your answers. Each food is tested individually with a minimum 72-hour observation window. This is the phase where discipline matters most — rushing it wastes the entire elimination phase.
Reintroduce foods from least likely to cause a reaction to most likely. This order minimizes the chance of a severe reaction early in the process and allows you to expand your diet as quickly as safely possible. The entire reintroduction phase typically takes 8-16 weeks.
Common sensitivity, clear reaction pattern. Yolks are less allergenic — testing separately helps identify if you react to whites only.
Test from least to most reactive. Ghee has virtually no casein or lactose. Butter has trace amounts. Hard cheese has minimal lactose. Milk is the most reactive form.
Nightshade sensitivity is common in autoimmune conditions. Cooking reduces glycoalkaloid content. Test each nightshade individually — you may tolerate some but not others.
Start with lower-allergenicity nuts like macadamia or cashew. Wait the full 72 hours between different nut types. Cross-reactivity is common.
Fermented soy is better tolerated due to protein breakdown during fermentation. This helps distinguish soy protein sensitivity from isoflavone sensitivity.
Whole corn is easier to identify reactions to than corn derivatives. If you react to whole corn, you will need to avoid all corn-derived ingredients.
Sourdough fermentation partially degrades gluten. If you react to sourdough, you are likely gluten-sensitive. If you tolerate sourdough but react to regular wheat, you may be reacting to modern wheat processing or additives.
Fish is less commonly reactive than shellfish. Test finfish separately from crustaceans and mollusks.
Accelerate Repair
The elimination phase is not just about removing triggers — it's an opportunity to actively repair the intestinal lining. These nutrients and strategies accelerate gut healing, which can allow you to tolerate previously reactive foods in the future.
5-10 g daily (powder in water, split morning and evening)
The primary fuel source for enterocytes (intestinal lining cells). L-glutamine directly supports the repair and regeneration of the intestinal epithelium. During periods of stress and inflammation, gut glutamine demand increases dramatically. Supplementation has been shown to reduce intestinal permeability in clinical studies.
Take on an empty stomach for best absorption. Start with 5 g daily and increase to 10 g if tolerated. Avoid in liver disease or ammonia metabolism disorders without medical supervision.
75 mg twice daily (provides ~16 mg elemental zinc per dose)
Zinc carnosine is a chelated compound that adheres to the stomach and intestinal lining, providing localized healing. It stabilizes the gut mucosal membrane, stimulates mucus secretion, and reduces inflammation at the gut wall. Clinical trials show it significantly reduces intestinal permeability (as measured by lactulose-mannitol testing) and is used in Japan as a prescription medication for gastric ulcers.
Take between meals. One of the few zinc forms specifically studied for gut healing. Do not exceed recommended doses — excessive zinc depletes copper. Consider a copper supplement (1-2 mg) if using long-term.
1-2 cups daily
Bone broth provides glycine, proline, and hydroxyproline — amino acids that are building blocks for collagen and the intestinal mucosal lining. Glycine is also a precursor to glutathione (the master antioxidant) and has anti-inflammatory properties. Gelatin in bone broth coats and soothes the intestinal lining. The minerals (calcium, magnesium, phosphorus) are in highly bioavailable forms.
Simmer bones for 12-24 hours with 1-2 tablespoons of apple cider vinegar (extracts minerals from bones). Use grass-fed beef bones or pasture-raised chicken carcasses. Caution: bone broth is high in histamine — if you have histamine intolerance, use freshly made broth consumed immediately rather than stored broth.
2-4 g combined EPA + DHA daily
EPA and DHA are precursors to resolvins and protectins — specialized pro-resolving mediators (SPMs) that actively resolve gut inflammation. Omega-3s also modulate tight junction protein expression, helping to restore intestinal barrier integrity. They shift the inflammatory balance away from omega-6-derived prostaglandins toward anti-inflammatory pathways.
Choose triglyceride form for best absorption. Take with a fat-containing meal. IFOS-certified for purity. During the elimination phase, fish oil is an ideal way to get omega-3s without eating multiple fish servings.
400-500 mg each, 2-3 times daily
Both herbs are demulcents — they produce a thick mucilage that coats and protects the intestinal lining. This physical barrier reduces contact between irritants and the damaged gut wall, allowing healing underneath. Slippery elm also stimulates nerve endings in the GI tract, increasing mucus secretion naturally. Marshmallow root has additional anti-inflammatory properties.
Take 30 minutes before meals for best coating effect. Available as capsules, powder, or tea. These are traditional herbal remedies with a long safety history. Take medications 2 hours apart from these herbs, as the mucilage may reduce drug absorption.
25-100 billion CFU daily (multi-strain formula)
Diverse probiotic strains (Lactobacillus, Bifidobacterium, Saccharomyces boulardii) help repopulate the gut with beneficial bacteria, compete with pathogenic organisms, produce short-chain fatty acids (butyrate) that nourish the intestinal lining, and modulate immune responses toward tolerance rather than reactivity. S. boulardii specifically reduces intestinal permeability.
Introduce probiotics during week 2-3 of the elimination phase, once initial gut inflammation has subsided. If probiotics cause bloating or discomfort, start with a lower dose and increase gradually. Soil-based organisms (SBOs) may be better tolerated for those with SIBO.
Important: Gut healing is not instantaneous. The intestinal epithelium turns over every 3-5 days, but full barrier restoration — including tight junction repair, mucus layer regeneration, and immune rebalancing — takes 3-6 months. Commit to both the elimination diet and the healing protocol for the full duration. Many food sensitivities are not permanent — they are symptoms of a damaged gut that can be repaired. See our Gut Health Guide and Gut Healing Guide for comprehensive protocols.
Special Consideration
If you experience flushing, headaches, hives, nasal congestion, or digestive distress that doesn't improve on a standard elimination diet, histamine intolerance may be the missing piece.
Histamine is a signaling molecule involved in immune response, digestion, and neurological function. Normally, the enzyme diamine oxidase (DAO) breaks down dietary histamine in the gut. Histamine intolerance occurs when histamine intake exceeds your body's ability to degrade it — either from excessive dietary histamine, impaired DAO production, or both.
Symptoms include: flushing, headaches/migraines, nasal congestion, hives, itching, digestive distress, anxiety, rapid heartbeat, low blood pressure, and menstrual irregularities. It affects an estimated 1-3% of the population, though many cases are undiagnosed. DAO enzyme deficiency is often secondary to gut damage, SIBO, or nutrient deficiencies (copper, B6, vitamin C).
If you suspect histamine intolerance, add a low-histamine layer to your elimination diet. This means avoiding not only the standard eliminated foods but also high-histamine foods and histamine-releasing foods. Follow the low-histamine protocol for 2-4 weeks while also supporting DAO production.
Histamine liberators don't contain histamine but trigger your body's mast cells to release stored histamine, causing the same symptoms as high-histamine foods.
Digestive Layer
FODMAPs (Fermentable Oligosaccharides, Disaccharides, Monosaccharides, and Polyols) are short-chain carbohydrates that are poorly absorbed in the small intestine and fermented by gut bacteria, causing gas, bloating, and digestive distress — especially in people with IBS.
If your elimination diet resolves some symptoms but significant bloating, gas, or digestive distress persists, FODMAPs may be contributing. This is especially likely if you have IBS, SIBO (small intestinal bacterial overgrowth), or notice that “healthy” high-fiber foods (garlic, onions, beans, apples) make you feel worse. A low-FODMAP phase is typically done for 2-6 weeks, followed by systematic reintroduction of each FODMAP category to identify your personal triggers and threshold doses.
Important: Low-FODMAP is not meant to be a long-term diet. Restricting FODMAPs long-term can reduce beneficial gut bacteria diversity. The goal is to identify your triggers, determine your tolerance threshold, then re-expand your diet as much as possible. Work with a FODMAP-trained dietitian for best results.
| FODMAP Type | High FODMAP (Avoid) | Low FODMAP (Safe) |
|---|---|---|
| Fructans | Wheat, garlic, onion, artichokes, watermelon | Rice, oats (GF), green beans, carrots, oranges |
| Galactans (GOS) | Lentils, chickpeas, kidney beans, soy milk | Tofu (firm), tempeh, canned chickpeas (rinsed) |
| Lactose | Milk, soft cheese, yogurt, ice cream | Lactose-free milk, hard cheese, butter |
| Fructose (excess) | Apples, mangoes, honey, agave, high-fructose corn syrup | Blueberries, strawberries, grapes, maple syrup |
| Polyols | Mushrooms, cauliflower, stone fruits (peach, plum), sugar alcohols (sorbitol, xylitol) | Potatoes, zucchini, bell peppers, bananas (firm) |
Advanced Consideration
Oxalates are naturally occurring compounds in many plant foods that can cause problems for a subset of individuals, particularly those with gut permeability, kidney stone history, or certain genetic variants.
Oxalic acid is found in many plant foods and binds to minerals (calcium, iron, magnesium) forming crystals. In a healthy gut, most dietary oxalate is broken down by Oxalobacter formigenes bacteria or excreted. However, when the gut is damaged (leaky gut), excessive oxalate can be absorbed into the bloodstream and deposited in tissues — joints, kidneys, thyroid, skin, and even the brain.
Symptoms of oxalate sensitivity include: kidney stones, joint pain, burning urination, vulvar pain, skin rashes, eye irritation, and brain fog. People who have recently increased their intake of high-oxalate “health foods” (spinach, almonds, sweet potatoes, beets, dark chocolate) may develop symptoms if their gut is compromised.
Practical Application
A successful elimination diet requires preparation. These sample meals demonstrate that eating well during elimination is not only possible but can be delicious and satisfying.
Professional Guidance
While many people can successfully execute an elimination diet independently, certain situations warrant professional guidance for safety and efficacy.
Complement with Data
While the elimination diet is the gold standard for identifying sensitivities, lab testing can provide valuable context — identifying underlying gut infections, permeability, and inflammatory markers that may be driving your reactions.
Evaluates gut microbiome composition, digestive function (elastase, calprotectin), inflammation markers, parasites, H. pylori, candida, and beneficial bacteria levels. Provides a snapshot of your gut ecosystem and identifies infections or dysbiosis that may be driving food sensitivities.
When to order: Before starting the elimination diet (baseline) and 3-6 months after gut healing protocol.
Directly measures the integrity of your intestinal barrier. Lactulose-mannitol testing measures sugar molecule transit through the gut wall — elevated lactulose recovery indicates increased permeability. Serum zonulin is a marker of tight junction opening. Confirms whether 'leaky gut' is present.
When to order: At baseline if you suspect gut permeability, and after 3-6 months of healing to verify improvement.
General marker of systemic inflammation. Food sensitivities that drive chronic immune activation will elevate hs-CRP. Useful for tracking whether the elimination diet is reducing your overall inflammatory burden. Optimal level is below 0.5 mg/L.
When to order: Baseline, 30 days into elimination, and quarterly during gut healing.
While not considered definitive (IgG can indicate exposure, not necessarily pathology), these panels can help prioritize which foods to test first during reintroduction. Most useful when combined with the elimination diet, not as a replacement for it. Some practitioners use IgA antibodies as a more reliable marker of mucosal immune activation.
When to order: Optional at baseline. Best used to generate hypotheses, not as the sole diagnostic tool.
Urine test that evaluates metabolic byproducts including markers of yeast/fungal overgrowth (arabinose), bacterial dysbiosis (HPHPA), mitochondrial function, neurotransmitter metabolites, and nutritional deficiencies. Helps identify underlying imbalances that may be driving food sensitivities.
When to order: At baseline if symptoms are complex or multisystem. Useful for identifying root causes beyond food triggers.
Measures hydrogen and methane gas produced by bacteria in the small intestine. Small intestinal bacterial overgrowth (SIBO) causes bloating, gas, and food intolerances that can mimic food sensitivities. If elimination diet provides incomplete relief, SIBO may be an underlying driver. Lactulose breath test covers more of the small intestine than glucose.
When to order: If significant bloating and gas persist despite a clean elimination diet, especially if symptoms worsen with FODMAPs.
Testing Strategy: At minimum, get hs-CRP before starting your elimination diet (baseline inflammation) and again at day 30. If budget allows, a comprehensive stool analysis (GI-MAP) at baseline provides the most actionable information — revealing dysbiosis, infections, and digestive function issues that may be the root cause of your food sensitivities. See our Biomarkers Guide for a complete testing framework.
FAQ
Gut Health
The microbiome, gut-brain axis, fermented foods, and daily protocols to optimize your digestive system.
Inflammation
Biomarkers, anti-inflammatory nutrition, and progressive protocols to resolve chronic inflammation.
Autoimmune
The AIP elimination protocol designed specifically for autoimmune conditions.
An elimination diet is powerful but can be overwhelming alone. A CryoCove coach guides you through every phase — from food selection and meal planning to reintroduction tracking and gut healing — while optimizing all 9 wellness pillars to accelerate your results.