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As my Lyme progressed I started having allergies to things I normally tolerated. Food was a big trigger. While on antibiotics sugar should be avoided. If someone is having trouble figuring out what foods they are reacting to, you can take your diet down to only chicken and rice (with only salt for flavor). Then slowly introduce new foods to figure out what's causing issues. For me it was foods that are red in color, coffee (might have been the creamer), dextrose, foods with yeast (like bread but not tortillas), and ice water (switched to room temp).