Food Sensitivity Testing in Brighton: Why Your Diet Might Be Working Against You

The Problem Nobody Talks About

You eat well. You exercise. You sleep reasonably. But something is still not right. The bloating that appears every afternoon. The headaches that come and go without any obvious trigger. The skin flare-ups that no cream seems to fix. The fatigue that lingers no matter how much rest you get.

At Brighton Bio Labs, this is one of the most common stories we hear. People who are doing everything "right" but still feel off. And more often than not, the culprit is hiding in plain sight: the food on their plate.

We are now offering a comprehensive food sensitivity test that analyses your blood for IgG-mediated reactions to over 200 individual foods across nine food groups. It is the most thorough food sensitivity panel available at our Hove clinic, and it is already changing the way our clients think about their diet.

Food Sensitivity vs Food Allergy: A Critical Distinction

Before we go any further, it is important to understand the difference between a food allergy and a food sensitivity, because they are fundamentally different processes.

A food allergy is an immediate IgE-mediated immune response. You eat a peanut, your throat swells, you reach for the EpiPen. The reaction is fast, obvious, and potentially life-threatening. Most people who have a food allergy know about it.

A food sensitivity is a delayed IgG-mediated immune response. You eat a food, and nothing happens immediately. But 12, 24, or even 72 hours later, you develop symptoms: bloating, a headache, a skin flare-up, joint stiffness, brain fog. Because the reaction is delayed, you almost never connect it to the food you ate two days ago.

This is exactly why food sensitivities are so difficult to identify without testing. You might eat bread on Monday, feel fine on Tuesday, and wake up with a migraine on Wednesday, never suspecting that the wheat was the trigger.

Why Elimination Diets Often Fail

The traditional approach to identifying food sensitivities is the elimination diet: remove suspected foods for several weeks, then reintroduce them one by one and monitor your symptoms. In theory, it works. In practice, it is extremely difficult to execute properly.

Here is why:

• You are guessing which foods to eliminate. Most people remove the obvious suspects, dairy, gluten, maybe eggs, but food sensitivities can involve foods you would never suspect. We have seen clients react to seemingly innocent foods like rice, chicken, or even lettuce
• The delayed reaction window makes tracking nearly impossible. With reactions occurring up to 72 hours after consumption, you would need to eat only one new food every three days to get reliable data. That is months of restrictive eating
• Multiple sensitivities create overlapping symptoms. If you are sensitive to three or four foods, removing just one might not produce a noticeable improvement, leading you to incorrectly conclude it was not the problem
• Compliance is brutal. Strict elimination diets are socially isolating, nutritionally challenging, and mentally exhausting. Most people abandon them before getting useful results

A blood-based IgG food sensitivity test bypasses all of these problems. One blood draw, 200+ foods tested, results in 14 days. No guesswork, no months of restrictive eating, no missed triggers.

What We Test: 200+ Foods Across 9 Groups

Our food sensitivity panel, powered by FoodPrint technology through our Randox laboratory partnership, tests your IgG response to over 200 individual foods organised into nine categories:

• Dairy: cow's milk, goat's milk, cheese varieties, yoghurt, butter, casein, whey
• Grains: wheat, gluten, barley, oats, rye, rice, corn, spelt, buckwheat
• Fruits: common and tropical fruits, berries, citrus
• Vegetables: root vegetables, leafy greens, nightshades (tomato, potato, pepper, aubergine)
• Fish and Seafood: white fish, oily fish, shellfish, crustaceans
• Meats: beef, lamb, pork, chicken, turkey, duck
• Herbs and Spices: common cooking herbs, spice blends, garlic, ginger
• Nuts and Seeds: tree nuts, peanuts, seeds, coconut
• Other: eggs, yeast, coffee, tea, chocolate, honey, soya

Each food receives a reactivity score, making it easy to see which foods are triggering a strong IgG response, which are borderline, and which are completely fine for you.

Who Should Consider a Food Sensitivity Test?

We recommend this test for anyone experiencing persistent, unexplained symptoms that have not responded to conventional approaches. The most common presentations we see at our Brighton clinic include:

• Digestive issues: chronic bloating, IBS symptoms, constipation, diarrhoea, excessive gas, or abdominal discomfort after eating
• Migraines and headaches: recurring headaches with no clear trigger, particularly if they seem to come and go unpredictably
• Skin conditions: eczema, acne, rosacea, or other inflammatory skin issues that do not respond to topical treatments
• Fatigue and brain fog: persistent tiredness, difficulty concentrating, or mental sluggishness, especially after meals
• Joint pain and stiffness: unexplained aches that are not related to injury or exercise
• Weight management difficulties: if you are eating well and exercising but your body is not responding as expected, chronic low-grade inflammation from food sensitivities can be a contributing factor

We also see clients who have already had standard allergy testing (IgE) that came back negative. A negative allergy test does not rule out food sensitivity, because they are testing different immune pathways entirely.

What Happens During Your Appointment

The process at our Hove clinic is straightforward:

1. Blood draw: A single venous blood sample is taken. The draw itself takes around five minutes
2. Laboratory analysis: Your sample is sent to our laboratory partner for IgG analysis against the full panel of 200+ foods. Results are typically available within 14 days
3. Results consultation: Rabea will sit down with you and walk through your personalised report in detail. You will see exactly which foods are triggering a response, how strong the reaction is, and receive tailored dietary guidance on what to adjust

The consultation is the most important part. A list of reactive foods is useful, but understanding what to do with that information is what actually changes how you feel. Rabea will help you build a practical, sustainable eating plan that works around your sensitivities without being unnecessarily restrictive.

The Science Behind IgG Food Sensitivity Testing

IgG (Immunoglobulin G) is the most abundant antibody in the human body. When your immune system encounters a food protein it perceives as a threat, it produces IgG antibodies specific to that food. These antibodies form immune complexes that can trigger inflammatory responses throughout the body.

Research has explored the relationship between IgG-mediated food reactions and various conditions. A study by Hardman and Hart (2007) found that dietary changes based on IgG food sensitivity results led to improvements in a range of symptoms including digestive discomfort, fatigue, and skin issues. More recent research has associated IgG-guided elimination diets with improvements in IBS symptoms and migraine frequency.

It is worth noting that IgG food sensitivity testing is a tool for exploration, not a definitive diagnosis. The results provide a structured starting point for identifying potential dietary contributors to your symptoms, which can then be confirmed through guided elimination and reintroduction under clinical supervision.

How Food Sensitivity Connects to Your Wider Health

At Brighton Bio Labs, we rarely look at food sensitivity in isolation. Chronic food sensitivities can contribute to systemic inflammation, which in turn affects everything from your energy levels to your skin to your hair health.

This is why we often recommend combining food sensitivity testing with a comprehensive blood panel. If your food sensitivity results reveal significant reactivity, we want to understand the full picture: are there nutritional deficiencies? Is there evidence of chronic inflammation? Are your gut health markers compromised?

For clients experiencing fatigue alongside digestive issues, we might also recommend IV nutrient therapy to rapidly correct any deficiencies while dietary changes take effect. If chronic inflammation has been depleting your B vitamins, magnesium, or iron stores, oral supplements alone may not be enough to catch up, particularly if your gut absorption is compromised by the very sensitivities we are trying to address.

Preparation: What You Need to Know Before Your Test

To ensure the most accurate results, please follow these guidelines before your appointment:

• Fast for 12 hours before your blood draw (water is fine)
• Avoid alcohol for 24 hours prior
• Continue your normal diet in the weeks leading up to the test. If you have already eliminated foods, the test may not detect a sensitivity to them because your body will not be producing the relevant IgG antibodies
• Continue any medications or supplements as normal, but let us know what you are taking when you arrive

That last point is particularly important. If you have already cut out dairy or gluten, for example, we may suggest reintroducing them for a period before testing to ensure accurate results.

Book Your Food Sensitivity Test

Our Food Sensitivity Test is priced at £279, which includes the blood draw, full IgG analysis of 200+ foods, and a face-to-face results consultation with Rabea. If you are new to blood testing, our complete guide to blood tests in Brighton explains the full process.

Book your Food Sensitivity Test at Brighton Bio Labs today. Or if you would like to discuss whether this test is right for your symptoms, message us on WhatsApp and we will be happy to chat.

Brighton Bio Labs is located at Float Spa, 125 Church Road, Hove BN3 2AN. Easily accessible from Brighton, Portslade, and across Sussex.