<<Disclaimer: Verify this information before applying it to your situation.>> >>It can be one nut, many or all It would be interesting to meet someone who has allergies to all nuts. Most nuts are totally unrelated foods. They have different protein structures. Most allergies are to a few food families, or to selected food(s) within a family. Pecans are related to walnuts, butternuts, heartnuts. Cashews are related to pistachios, which are related to poison sumac and ivy (and mangoes). Almonds are unrelated to any other nut. They are a member of the rose family, and are related to peaches, cherries, nectarines, apricots..., and, of course rose hips. Peanuts are unrelated to other nuts, as they are in the legume family (same as soybeans). Filberts stand alone. Brazil nuts stand alone. Pine nuts stand alone. Chestnuts stand alone. Beechnuts stand alone. Coconuts are also not related to any other nuts, and less so than any of the others. (by "stand alone", I mean unrelated to other "nuts". They do have other plant relatives. So, as you can see, it would be odd indeed to have a true "allergy" to such a wide variety of unrelated foods. It is just like someone who says they are allergic to all "grains". It depends upon how you define a "grain". If grain means member of the grass family, fine. If it includes buckwheat, amaranth, quiona, and other "non-grains", then I would be suspicious, as those are just seeds of totally unrelated plants from unrelated families. Thankfully, nature has provided us with enough diversity that even the entire grass family can be avoided, yet people could still get grain-like nutrition from non-grains. Joanne