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seafood intolerance food

Seafood Intolerance

If you have an intolerance (defined by YorkTest as a food-specific IgG reaction) to seafood or shellfish, your body produces an inflammatory response to the fish or shellfish proteins present.

Unlike seafood allergy, the effects of seafood intolerance are usually delayed, and are not life threatening but can cause you to feel unwell.

Where to look

If shellfish is present in a food product, it is usually listed on the packaging. However, it is a good idea to familiarise yourself with the various types of seafood and shellfish to be aware of if you have a seafood intolerance.

  • White fish (cod, plaice, sole, coley, haddock, pollock, monkfish)
  • Oily fish (mackerel, tuna, sardines, anchovies, salmon, pilchards, herring, trout, tuna)
  • Molluscs (clams, mussels, oysters, snails, scallops, squid, octopus)
  • Crustaceans (crab, lobster and shrimp)

Premium Food Intolerance Test

£249.00 £149.00

+ FREE Delivery on all orders

Easy to use home-to-laboratory test kit

Take our most comprehensive food and drink intolerance* test to find out whether you have a sensitivity to over 200 food and drink ingredients. Simply take a finger-prick blood sample and return by post for testing. Receive your results within 5 days of receipt of your sample! No social interaction required.

Optimise your lifestyle with our support, knowing which foods you’re reacting to.

  • Measures all four subtypes of food-specific IgG
  • Simple finger-prick blood test
  • Receive expert, accurate analysis from our fully-accredited laboratory technicians
  • Results listed in easy-to-read traffic light values: high, borderline, and normal reactivity
  • Discuss your results with a nutritional therapist. One 30-minute consultation included
  • Track your progress with a food and drinks diary
Fresh strawberry and avocado salad

Replacements for a balanced diet

White fish is an excellent source of protein, vitamins and minerals. The Food Standards Agency recommends that we eat at least two portions of fish a week, with at least one of these being oily fish which is particularly nutritious.

However, if you are suffering from a seafood intolerance, it is important to discover which seafood in particular you react to and to make sure you include suitable fatty acid replacements in your diet such as:

  • Leafy greens such as spinach
  • Avocado
  • Walnuts, brazil nuts, hazelnuts and pecans
  • Olive oil and flaxseed oil
  • Eggs
  • Sesame butter, pumpkin seed butter
  • Tofu
  • Coconut oil

If you have found out that you are intolerant to seafood or shellfish, changing your diet need not be daunting. YorkTest Nutritional Therapists are here to help you understand how to optimise your food choices.

How it Works

4 Simple Steps to a Healthier You


Receive your test.

Order online and we’ll post your kit directly to your home.


Take the easy fingerprick blood test.

Pop 2-3 drops of blood into the lancet and post your sample to our laboratory.


Receive your results online within 5 days.

Review your reactivity levels and book your appointment with one of our qualified nutritional therapists.


Ongoing support.

Receive free nutritional therapist advice, with ongoing support from our customer care team by your side.

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