If certain meals leave you bloated, tired, foggy-headed or itchy, and you can't quite pin down why, a food intolerance could be behind it. Unlike a food allergy, which triggers an immediate immune reaction, intolerances build up quietly over hours or even days, which is exactly why they're so hard to self-diagnose from a food diary alone.
What is a food intolerance test?
A food intolerance test measures your body's IgG antibody response to a wide panel of common foods, things like dairy, gluten, egg, soya, yeast and specific fruits and vegetables. A raised reaction to a food doesn't mean an allergy; it means your immune system is responding to that food more than others, which can be linked to the kind of low-grade, delayed symptoms intolerances typically cause.
What symptoms might point to a food intolerance?
Common signs people report before testing include:
- Bloating or stomach cramps after eating
- Fatigue or "food coma" that feels disproportionate to the meal
- Headaches or brain fog
- Skin issues like eczema flare-ups or itching
- Irregular bowel habits with no other explanation
None of these are exclusive to food intolerance, which is exactly why testing, rather than guessing, is useful.
How does the test work?
Check My Body Health's food intolerance test is designed to be done entirely from home:
- Order your test kit online
- Take a small finger-prick blood sample (full instructions included)
- Post your sample back in the prepaid envelope
- Receive your results online, typically within a set number of working days
Your results show your reaction level to each food tested, from no reaction, through borderline, to high reaction, so you can see at a glance which foods are worth reducing or eliminating first.
What happens after I get my results?
Most people start by removing their highest-reacting foods for a short period, then reintroducing them one at a time to see whether symptoms improve. It's worth doing this gradually rather than cutting everything at once, both so you can actually tell what's making a difference and so you don't restrict your diet unnecessarily. If you have any underlying health conditions, it's worth discussing your results with a GP or nutritionist before making major dietary changes.
Food intolerance vs food allergy: what's the difference?
A true food allergy involves the IgE antibody and can cause a fast, sometimes severe reaction: welling, hives, difficulty breathing. It needs medical diagnosis and management, not an at-home test. A food intolerance is a slower, IgG-linked response that causes discomfort rather than danger, and is what this type of test is designed to screen for. If you've ever had a sudden, severe reaction to a food, speak to your GP rather than relying on intolerance testing.
