A larger study of food-related IgG confirms the possible new epidemiological approach to non-IgE-mediated reactions and suggests five great food clusters

Five great food clusters have been identified. The first one consists of highly Nickel-containing
foods such as tomato, kiwi fruit, peanut, almond and buckwheat. Within this group
it is possible to identify the second cluster including wheat and related grains such
as kamut, spelt and barley. The third cluster contains dairy products (cow and goat
milk as well as parmesan, mozzarella and ricotta cheese). The fourth one includes
yeasts such as Candida albicans and Saccharomyces cerevisiae and contains also porcini and champignon mushrooms. This cluster is probably connected
with fermented foods. The last cluster, less detailed, probably contains foods with
a higher concentration of natural salicylates: products such as honey, tea, courgettes,
oranges and so on.