A nickel-free diet is virtually impossible because far too many food items contain nickel. If you are hypersensitive, you will probably have to deal with outbreaks of eczema for the rest of your life. Unfortunately, this kind of hypersensitivity is particularly bad for vegetarians and vegans as food plants are often heavier on nickel than animal products.
I found that cutting out the following common food items made a real difference:
Nuts, especially pecan and cashew
Anything with undefined flavors (aroma)
This includes all processed foods containing any of the above, almost all cereal bars and almost all pesto.
Ramona’s tip: Get used to reading labels. Always. Even for things you wouldn’t suspect.
Having a nickel allergy is not uncommon nowadays, which is why we see so many items labelled “nickel free.” Not so well-known is the fact that you can also have an adverse reaction to nickel in food in form of a non-allergic food hypersensitivity, also known less precisely as food intolerance. If you have a nickel allergy, it means that direct contact with nickel causes a skin reaction, which either manifests itself immediately or quickly after contact. This is called an allergic contact dermatitis. Hypersensitivity to nickel in food is not a food allergy like, for example, a nut allergy. A food allergy is caused when the body misidentifies a certain food item as harmful and launches a fast-acting immune mechanism in the body, usually by releasing high amounts of antibodies. The reaction is more or less immediate and can, in extreme cases, lead to an anaphylactic shock. Nickel in food is not life-threatening, but it poses some severe restrictions on your diet. The symptoms often take a while until they manifest themselves, so that identifying a particular food item as the cause for the reaction can be quite difficult. Although the body requires nickel, just as it needs iron and zinc, it only requires minute amounts. If you are intolerant to nickel in food, it means that the body is unable to deal with any excess in your body. You are passing a threshold of tolerance and suddenly what is considered healthy becomes the cause of eczema.
For general information on food allergies and intolerances, check this site: http://www.foodallergens.info/Facts/Symptoms.html