Why the Terms Became Confusing

Medical allergy organizations often use the word “intolerance” only for non-immune reactions (for example, lactose intolerance). But in nutrition and wellness research, you’ll often see food sensitivity and food intolerance used as the same concept—delayed reactions that may involve:

• IgG antibodies
• gut inflammation
• digestive stress
• delayed immune responses

Because symptoms may appear hours or even days later, many people struggle to identify trigger foods without a structured plan. If you’re unsure where to start, see: How to Start an Elimination Diet After an IgG Test .

Common Symptoms of Food Sensitivity / Intolerance

Delayed food reactions can show up in ways that don’t always feel “food-related” at first. Common symptoms include:

• Bloating, cramps, digestive discomfort
• Acne, eczema, or other skin issues
• Headaches & migraines
• Fatigue or inconsistent energy levels
• Brain fog, focus problems
• Mood swings or irritability
• Weight gain or difficulty losing weight

More symptom guides:

Bloating  •  Acne  •  Brain Fog  •  Weight Gain  •  Fatigue

What Causes Delayed Food Reactions?

Delayed reactions may be influenced by:

• IgG immune responses to frequently eaten foods
• Gut inflammation or digestive stress
• Enzyme insufficiencies
• Microbiome imbalance
• Overall inflammatory load, stress, or sleep

Learn more:

What Causes Food Sensitivity?  •  Gut Inflammation  •  Common Trigger Foods

How IgG Testing Helps

Because delayed reactions are difficult to track manually, many people use IgG sensitivity testing to map potential trigger foods, identify patterns, and build a more personalized elimination diet.

Pinnertest analyzes 200 or 250 foods to help reveal hidden correlations—especially if symptoms appear inconsistently or days after eating.

Compare panels: PinnerTest 200  •  PinnerTest 250

Sensitivity / Intolerance vs Allergy

Sensitivities and intolerances do not cause anaphylaxis, rapid swelling, or severe immediate reactions. Those symptoms are more commonly associated with IgE-mediated food allergies.

For a deeper breakdown, see: Food Sensitivity vs Allergy vs Intolerance .

Important Notes & Limitations

Pinnertest does not diagnose:

• Food allergies (IgE)
• Celiac disease
• Medical conditions

Pinnertest identifies delayed IgG-mediated reactions that may contribute to digestive symptoms, skin changes, energy issues, and inflammation.