Other symptoms include stomach pains, or diarrhoea. Symptoms of food allergy typically include hives (urticaria), swelling around the mouth, and vomiting, usually within 30 minutes of eating a food. Allergic reactions to peanut, tree nuts or seeds can sometimes be severe Therefore, it is not possible to reliably predict the likelihood of allergy to seed or nut like foods without allergy testing to that particular food. It may be difficult to predict whether a person will be allergic to one unique protein allergen present in one food only, or several similar cross reactive proteins present in multiple foods. Examples of cross reactivity include people allergic to similar proteins present in hen and duck eggs cow's and goat's milk or cashew and pistachio nuts. If the same protein is present in several foods, then that person may have allergic reactions to any food containing that protein. Cross reactivity is difficult to understand and harder to predictĬross reactivity means that a similar protein is present in a range of different foods. Therefore, someone who is allergic to peanut is not automatically going to be allergic to tree nuts. The proteins in peanut are very different to those in tree nuts which include almonds, Brazil nuts, cashews, hazelnut, macadamia nuts, pecans, pistachios or walnuts. Peanuts are legumes, like peas, lentils and chickpeas, and diverse other plants like wattles and the black bean tree of Queensland. Many of the foods that we consider to be nuts are part of a seed or its food source, often with the outer fruit or coating removed. Coconut husk and inner white flesh is also a seed. Small seeds include sesame seeds, sunflower seeds, poppy seeds or pumpkin seeds.Tree nuts has limited meaning, as the foods that we consume from these plants come from a wide variety of different botanical families such as Rosaceae (almonds), Anacardiaceae (cashews), Proteaceae (macadamias) or Lecythidaceae (Brazil nuts).Legume is often used to describe peanut as well as other plants like peas, chickpeas and soy yet this group of plants also includes wattles and the black bean tree of Queensland.The terms tree nuts or seeds are rarely useful for predicting allergy to foods of similar appearance or taste. The meaning of the term nuts, seeds and legumes can be confusing, for people with allergies to these foods (or their carers), when trying to decide what foods to avoid. Some people may be allergic to more than one protein in more than one food, so they may be allergic to several foods. If a person is allergic to one protein present in one food only (such as peanut or egg) then an allergic reaction can only occur if they eat that food. Proteins in food can trigger allergic reactions in some people. Peanut allergy is common (3% of infants have peanut allergy), it can be hard to avoid, and in some cases even trace amounts of peanuts can trigger symptoms. Peanut and tree nut allergy is most common in infants and young children, but may appear for the first time in adults. ASCIA PCC Peanut treenut seed allergy 2019
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