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Thank you for your answer. I'd like to give you a little more background information so you understand my response. We are caucasion. I am a registered dietitian and have 2 children with food allergy. However, I am not an expert in all areas of nutrition as it is a vast field. My youngest is allergic to wheat. So, elimination diets are a way of life for us. My clinical and food expertise helps me understand your response. The parent (who is a little tired of food eliminations) in me is resistant to eliminating another food without just cause. I understand that trial and error may be necessary to get an answer to my problem. However, this is a relatively new problem in my 9 year old (maybe a month or so). Do you really think this could be lactose intolerance? I'm more accepting of the fructose intolerance theory because he has reported the rotten egg burps after eating bananas. However, ugh....eliminating fruit from his diet seems like a formidable task. I know...this is coming from someone who has already eliminated foods from her children's diets already. If we take that next step, how long would be realistic to expect to see an improvement? Also, would fructose intolerance take this long to develop? The only major problem he has had recently was influenza A in late September. Otherwise, he is a very healthy kid. Neither my husband nor I have any food allergies or intolerances. Any additional help would be appreciated.