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© 2026. The Purpl Co Limited. All rights reserved.
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© 2026. The Purpl Co Limited. All rights reserved.
6 min read
Written by
Georgina, Founder of Purpl
Published on
August 14, 2026
Last reviewed: 14 August 2026
Applies to: UK
Written by: Georgina, Founder of Purpl
The issue: Living with a long-term health condition or disability often comes with persistent symptoms like chronic fatigue, brain fog, bloating, and joint stiffness. While these can be core features of an underlying diagnosis, secondary factors, such as delayed food intolerances (IgG reactions) or subtle nutrient deficiencies, can silently compound your symptom load.
The solution: Official NHS guidance on food intolerance recognises food intolerance as a condition and identifies blood testing as a valid method for signposting potential problem foods. Identifying specific sensitivities or checking key blood markers (such as Vitamin D, B12, or iron) helps you make targeted, safe lifestyle adjustments rather than relying on guesswork.
How Purpl helps: Private health testing can be expensive, adding to the extra cost of disability. Purpl partners with YorkTest to provide verified member discounts on accredited home-to-laboratory testing, helping disabled people and carers access health insights for less.
When you live with a long-term condition, such as Multiple Sclerosis, Fibromyalgia, ME/CFS, IBS, Long COVID, or an autoimmune condition, it is easy to attribute every flare-up, exhaustion spike, or digestive issue directly to your primary illness.
However, secondary health triggers can quietly add to your daily “symptom budget” without your knowledge:
Founder’s insight (Georgina):
“For a long time, I completely ignored advice about food triggers and gut health. Living with Multiple Sclerosis, I assumed my constant bloating, stomach discomfort, and sudden energy slumps were just part and parcel of my diagnosis. It was only when I finally stopped guessing and looked into specific food triggers that I realised certain everyday ingredients were actively causing flare-ups. Addressing those hidden triggers did not cure my MS, but removing that constant strain on my gut freed up valuable daily energy I didn’t know I was losing.”
Purpl insight: When managing Multiple Sclerosis or chronic illness, reducing secondary physical stressors can make a noticeable difference in daily energy conservation. Removing foods that provoke an inflammatory reaction allows your body to focus its resources where they matter most.
It is important to distinguish between a food allergy, a food intolerance, and an autoimmune condition like coeliac disease.
| Feature | Food allergy (IgE) | Food intolerance (IgG) |
| Immune mechanism | Fast IgE antibody reaction | Delayed IgG antibody reaction (subtypes 1 to 4) |
| Onset time | Immediate (minutes to 2 hours) | Delayed (up to 48 hours) |
| Typical symptoms | Hives, swelling, wheezing, anaphylaxis | Bloating, fatigue, brain fog, IBS flare-ups, joint aches |
| Severity | Can be life-threatening | Distressing and chronic, but non-life-threatening |
| Diagnostic approach | NHS allergy clinic / IgE blood test | Laboratory IgG blood test and elimination diet |
Official NHS guidance on food intolerance categorises food intolerance as a recognised condition and explicitly includes blood testing as a method for investigating dietary triggers.
When considering testing options, it is important to understand how accredited laboratory testing aligns with NHS best practice:
NHS guidance warns against instant home testing kits that claim to give immediate on-the-spot results without clinical analysis. YorkTest operates as a home-to-laboratory test. You collect a small finger-prick blood sample at home using a sterile wand, which is then posted directly to an ISO-accredited laboratory for quantitative ELISA analysis by trained scientists.
Food intolerance tests do not diagnose medical conditions. Instead, laboratory analysis identifies elevated IgG antibody levels to specific food proteins, serving as a scientific “starting point” or signpost for a structured elimination diet.
The NHS advises against eliminating multiple food groups all at once, as drastic cuts can cause nutritional deficiencies. In line with this guidance, YorkTest recommends eliminating a maximum of one to three problem foods at a time while monitoring symptoms in a food diary.
Dietary changes should be made with expert oversight. YorkTest includes consultations with BANT-registered Nutritional Therapists to ensure any temporary food eliminations are balanced with nutritious alternatives.
Evidence-based outcomes: Long-term survey data collected between 1998 and 2025 across 12,589 patients, building on independent research published by the University of York, showed that 76% of individuals who modified their diet based on YorkTest IgG blood test results reported a noticeable benefit in their health.
You can review full YorkTest scientific research and clinical references for further details.
Living with a disability already carries an average extra cost of hundreds of pounds per month. Trying to identify food triggers through trial and error often makes that financial burden worse:
Getting a scientific “food fingerprint” from an accredited laboratory eliminates guesswork, ensuring you only replace the specific ingredients that are actively causing reactivity.
YorkTest provides finger-prick blood collection kits that you can complete entirely at home, removing the need to travel to a clinic or wait for a hospital appointment.
1. Order kit online with your Purpl discount
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2. Take a quick finger-prick blood sample at home using the wand
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3. Post sample to the ISO-accredited laboratory using prepaid mail
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4. Receive traffic-light results online within 7 days
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5. Have a 1-on-1 consultation with a qualified Nutritional Therapist
Accessing YorkTest through Purpl
Purpl members can access savings across YorkTest’s entire range of at-home testing kits. Explore the verified 40% off YorkTest offer and offset the extra costs of living with a disability.
If your test results reveal high reactivity to specific foods, it is vital to adjust your diet safely to maintain adequate nutrition:
Yes. Official NHS guidance on food intolerance acknowledges food intolerance as a condition and lists blood testing as an established investigation method. The NHS recommends using blood test insights to guide a structured elimination and reintroduction diet supervised by a nutritional expert.
An instant “home test” attempts to diagnose conditions on the spot without laboratory analysis. A “home-to-laboratory test” (like YorkTest) simply uses an at-home finger-prick blood sample, which is then sent to an accredited laboratory for quantitative analysis by trained scientists.
Yes. Food intolerances cause delayed IgG antibody reactions, which can trigger low-grade systemic inflammation and overwork the immune system. This frequently manifests as lethargy, brain fog, and reduced daily energy.
Once your sample reaches YorkTest’s ISO-accredited laboratory, your results are processed and uploaded to your secure online portal within 7 days.
When living with a disability or long-term health condition, managing your day-to-day well-being is about controlling the factors you can influence. While you may not be able to eliminate your primary condition, identifying hidden food intolerances or vitamin deficiencies through accredited home-to-laboratory testing can reduce unnecessary inflammation, relieve gut distress, and free up valuable energy reserves.
Georgina is the Founder of Purpl, a disabled-led UK discount platform built to offset the extra cost of disability. Living with Multiple Sclerosis, she creates accessible guidance on benefits, household savings, and health self-advocacy. Purpl partners with verified brands to provide exclusive discounts for disabled members and carers.
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