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Thank you to all who have responded with thoughtful advice. I cook a varied diet at home with everything except gluten.  I don't drink wine at home or out.   I am not sensitive to dairy or soy, and I avoid obvious contaminants, like marinades. After all the responses it is obvious why this has been so hard to figure out.  I think I may have to Learn to live with a headache when I eat out. 
Thank you all,  
Karen 
 

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