A: I don't know the science behind this, but it seems that this approach has been mentioned by several doctors in the studies, as a possible approach:
If you have contact allergic dermatitis (ACD) to nickel, you don't automatically have the systemic version - allergy to the dietary nickel in foods you eat. To determine if your nickel allergy is "systemic" two steps are involved:
1. Do a strict low nickel diet for 8 weeks (keeping below 100 ug of dietary nickel daily, if possible, and not exceeding 150 ug per day).
2. "Oral provocation test" ... after the 8 weeks, you will notice that your symptoms have improved. However this doesn't mean you have SNAS. The provocation challenge will tell you this -- It involves introducing high nickel foods again. After a period of 4 days to several weeks, if your symptoms return, this means that you are reacting to dietary nickel, or that in fact, you have SNAS.
2. "Oral provocation test" ... after the 8 weeks, you will notice that your symptoms have improved. However this doesn't mean you have SNAS. The provocation challenge will tell you this -- It involves introducing high nickel foods again. After a period of 4 days to several weeks, if your symptoms return, this means that you are reacting to dietary nickel, or that in fact, you have SNAS.
Discuss with your doctor ... especially important here in North America, as most doctors aren't really clear on SNAS or whether it is a "real" condition. The oral provocation challenge is the proof.
If you aren't reactive later on with the reintroduction of higher nickel foods - Yay you!
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