An allergy can stop your breathing; a sensitivity can drain your weeks. Understanding the IgG immune response.
A food allergy and a food sensitivity are not the same thing, and confusing them is one of the most common reasons people get stuck. A true allergy is an immediate, sometimes severe immune reaction — the kind that can swell an airway or send someone to the ER. It's usually driven by IgE antibodies and shows up fast.
A food sensitivity is slower and quieter. It's driven by a different part of the immune response — often IgG — and it can take hours or days to build. You don't necessarily react the way you'd think of as 'allergic': no hives, no emergency. Instead, it can show up as joint aches, headaches, brain fog, fatigue, or gut discomfort that grinds on for days.
Because the reaction is delayed and cumulative, it's hard to spot by feel. The foods that bother you are often ones you eat every day — foods you'd swear are fine. The load adds up over the week until your immune system is quietly on high alert, and the inflammation it sustains becomes the background noise of your pain.
That's why a food sensitivity panel can be so clarifying. It's not about fear or forever-elimination. It's about seeing which everyday foods are quietly adding to your load — so we can remove them for a while, let your system settle, and reintroduce them as you recover.
This article is educational and supportive — it's not a substitute for medical diagnosis or emergency care. If something here resonates with what you're experiencing, the two-minute symptom quiz is a good place to start, and the complimentary consult is where we'd look at your full picture together.