The skin sensitivity test is a simple way to test if your gut and immune system will react in an inflammatory manner to a food before ingesting it and potentially experiencing more serious reaction symptoms.

What is the Skin Sensitivity Test?
The skin sensitivity test is a practical self-test that most people on the GAPS Diet can complete at home to determine if now is the right time on your healing journey to introduce a new food. Food sensitivities don’t need to be permanent, time and healing leaky gut with the GAPS Diet can help you overcome most food sensitivities.
Who should perform the Skin Sensitivity Test?
Anyone who wants to introduce a new food or a food that has been eliminated for a while.
If you have an anaphylactic, or life-threatening, reaction to a food, do not perform this sensitivity test unless recommended by a medical practitioner.

How to perform the Skin Sensitivity Test
The sensitivity test is described by Dr. Natasha Campbell-McBride in her books, Gut and Psychology Syndrome and Gut and Physiology Syndrome.
- Take 1 drop of the food and apply it to the inside of the wrist before bedtime. If food is solid, mash it with a little water to create a paste.
- Leave the drop dry on the skin and leave there overnight.
- In the morning, check the spot for any reactions.
If a red irritation appears, avoid the food for a few more weeks before trying the test again.
If no reaction appears start to gradually and slowly introduce the food, and continue to watch for body reactions as you increase the amount.
What are the most common foods people react to?
Food sensitivity reactions can happen at any stage of healing on the GAPS diet but are most common when introducing new foods in particular eggs, dairy, tree nuts, peanuts, fish, and shellfish.

Resources
Dr Natasha Campbell-McBride
- Gut and Psychology Syndrome (Yellow Book)
- Gut and Physiology Syndrome (Blue Book)
GAPS™ and Gut and Psychology Syndrome™ are the trademark and copyright of Dr. Natasha Campbell-McBride.
The information in this blog post is my personal experience and for educational purposes only. It is not intended to diagnose, treat, cure or prevent any disease; and does not consider your individual situation. If you have medical questions, please consult with a qualified medical practitioner.
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