1) You could be experiencing banana allergy: http://studenthealth.oregonstate.edu/answerspot/message.php?message=8706 http://www.nlm.nih.gov/medlineplus/ency/article/000817.htm http://en.wikipedia.org/wiki/Banana#Allergic_reactions "The key to the management of patients with food allergy is avoidance of foods known to have or suspected of having caused a reaction. Since elimination diets may lead to malnutrition or other serious adverse effects (e.g., personality change), every effort should be made to ensure that the dietary needs of the patient are met and that the patient and/or caregiver(s) are fully educated in dietary management. Once the diagnosis of food allergy is confirmed, the patient should be advised to avoid eating the food." Source: http://www.guideline.gov/summary/summary.aspx?doc_id=9218&nbr=4958 You should clear this point before looking for a substitute, I think. http://www.nzfsa.govt.nz/consumers/food-safety-topics/chemicals-in-food/allergies/food-safety/index.htm 2) These answers were given: http://forums.prevention.com/eve/forums/a/tpc/f/5781095702/m/3411080952 http://www.autismweb.com/forum/viewtopic.php?p=35260&sid=c14e7c979c0487f84d16736133e734e6